Which of the following statements is a false statement ?
A. Prokaryotes have a nucleus.
B. Chloroplasts enable plants to get their energy directly from sunlight
C. Leewenhoek reported his discovery of protozoa and later saw bacteria for the first time
D. The nucleus and the mitochondria are each surrounded by a double membrane.
E. Mutations are mistakes in the DNA that change the genetic plan from that of the previous generation
Answers
Option (A) is False i.e., Prokaryotes have a nucleus, because they are the organisms whose cells lack a nucleus.
What is Nucleus?Nucleus, the region of a cell that holds the chromosomes. The membrane-enclosed nucleus is where RNA is synthesised from the chromosomal DNA. The nucleus carries the genes, structures that hold the genetic information, and controls and regulates the functions of the cell (such as growth and metabolism).
A. Prokaryotes have a nucleus : False
B. Chloroplasts enable plants to get their energy directly from sunlight : True
C. Leeuwenhoek reported his discovery of protozoa and later saw bacteria for the first time : True
D. The nucleus and the mitochondria are each surrounded by a double membrane : True
E. Mutations are mistakes in the DNA that change the genetic plan from that of the previous generation : True
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Related Questions
2. A barrel floats down a river past two flags that are 100 meters apart. The time it took for the barrel to pass each flag is shown. What is the speed of the stream's
current?
2:15
2:43
O A 0.28 m/s
OB.2.2 m/s
OC.2.4 m/s
OD.3.6 m/s
Answers
The speed of the stream's current is 3.6 m/s.
The given parameters:
distance between the two flags, d = 100 mtime when it passed the first flag, t₁ = 2:15 time when it passed the second flag, t₂ = 2:43 What is speed?The speed of an object describes the rate of change of an object's distance.The change in the time of motion of the barrel is calculated as follows;
Δt = t₂ - t₁
Δt = 2:43 - 2:15
Δt = 2 min 43 s - 2 min 15 s
Δt = 43 s - 15 s
Δt = 28 s
The speed of the stream's current is calculated as follows;
\(v = \frac{d}{t} \\\\v = \frac{100 \ m}{28 \ s}\\\\v = 3.57 \ m/s\\\\v \approx 3.6 \ m/s\)
Thus, the speed of the stream's current is 3.6 m/s.
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What reactants are used during photosynthesis?
A. H₂0 and CO₂ and chemical energy
B. H₂0 and CO₂ and sunlight energy
C. C₂H₂O₂ and H₂0 and sunlight energy
D. C₂H₂O₂ and H₂0 and chemical energy
Answers
Answer: B, H20, CO2, and sunlight energy
Which of the following is an example of a nonmetallic mineral?
a sulfur
b. lead
c. aluminum
d. gold
Please select the best answer from the choices provided
A B C D
Answers
Answer:
a. sulfur
Explanation:
Sulfur is an example of a nonmetallic mineral
Non-metallic mineral
Non-metallic minerals are the minerals that do not contain metals, eg limestone, mica, coal etc. Such materials lack metallic characteristics like good electric and thermal conductivity, luster, rigor and malleability.
Sulfur is a non-metallic element with atomic number 16. It is considered as non metal because:
It is poor conductor of heat and electricity. Its density is lower than that of all metals. The electronegativity of sulfur is very high as compared to other metals. It is multivalent atom which is tasteless and odorless.
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Chloroplasts are the organelles in plant cells that convert solar energy to chemical energy (sugars) that can be used by the cell. Mitochondria are organelles in all eukaryotic cells that convert sugars to ATP Both organelles are have double membranes and contain their own set of DNA. What is the likely explanation for this?
Answers
The chloroplasts and mitochondria are known as the membrane bound organelles.
Membrane bound organellesThe cells of living organism contain membrane bound organelles which are surrounded by their lipid bilayer and they contain their own set of DNA.
Example of membrane bound organelles are:
Chloroplasts: This organelle contains chlorophyll which convert solar energy to chemical energy (sugars) that can be used by the cell during photosynthesis.This is found only in plants which are producers.
Mitochondria: This organelle is found in animal cells which are used to convert sugars to ATP.Therefore, the chloroplasts and mitochondria are known as the membrane bound organelles.
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How does an organism composed of relatively small cells have an advantage over one made of larger cells?
Answers
The surface area-to-volume ratio of a cell diminishes with growth. If the cell were in the form of a cube, the same reasoning would hold true. The plasma membrane won't have enough surface area if the cell enlarges too much to accommodate the volumetric rise in diffusion rate.
In other terms, a cell gets less effective as it develops. One technique to increase efficiency is to divide, while another is to create organelles with specific functions. Smaller single-celled creatures have a high surface-to-volume ratio, which enables them to rely on material and oxygen diffusion into the cell (and waste diffusion out) to survive. This method can be more effective if the objects have a larger volume to surface area ratio. Larger animals need specialized organs (such as the lungs, kidneys, and intestines) that efficiently increase the surface area accessible for exchange activities, as well as a circulatory system to transport materials and heat energy between the organism's surface and core.
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Javier and Jessica are measuring the water temperature of a stream. Javier records the water temperature as 56 degrees. Jessica tests the water at the same location but finds the temperature to be 13 degrees. What is most likely cause of the different results and how should they be remedied in the future
Answers
The most likely cause is using different temperature scales. They should use the same scale and calibrate equipment.
Javier recorded the temperature as 56 degrees, which may suggest he was using the Fahrenheit scale. Meanwhile, Jessica found the temperature to be 13 degrees, indicating she may have been using the Celsius scale.
The two scales have different freezing and boiling points, which can result in significantly different temperature readings. To avoid this issue in the future, they should ensure they are using the same temperature scale and regularly calibrate their equipment to ensure accurate measurements. By doing so, they can increase the reliability of their results and minimize measurement errors.
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construct an argument about the effect of changing a section of rainforest into a cultivated field. Use the word community as it is used in the context of biology at least once in one of the premises of your argument
Answers
Premise 2: Changing a section of the rainforest into a cultivated field alters the balance of the ecosystem, which can have negative effects on the community.
Premise 3: The community of living creatures in the rainforest includes not only the animals and plants that directly inhabit the area, but also the microorganisms and other organisms that play important roles in maintaining the ecosystem.
Conclusion: Therefore, converting a section of the rainforest into a cultivated field can have serious consequences for the entire community, including the loss of biodiversity and ecosystem services, such as carbon storage, water regulation, and climate regulation. Additionally, the disruption of the rainforest can lead to the displacement of animals and plants, causing further harm to the community. Overall, it is important to carefully consider the impacts that altering the rainforest can have on the community and planet.
Two populations have been geographically isolated from each other for many generations.
Which statement is most likely correct about the two populations?
O They can still produce viable offspring with each other.
O They can't reproduce with each other.
O They look very similar to each other.
O Their gene pools are highly similar.
Answers
Answer:
The most likely correct statement about the two populations that have been geographically isolated from each other for many generations is "Their gene pools are highly dissimilar."
When populations are geographically isolated from each other, they are unable to interbreed, therefore, they evolve independently from each other. Over time, different selection pressures and mutations cause genetic differences to accumulate between the two populations. These genetic differences will become evident when the two populations are brought back together. If the genetic differences are large enough, the two populations may no longer be able to interbreed and produce viable offspring.
c) What conclusion can you make about the SG/density of Earth materials that cannot be
sampled? In other words, why is your average numerical value (from 3a) different
from the average (5.5) of the whole Earth?
Answers
The attribute of matter known as density is expressed by a ratio of mass to unit volume of substance. Also known as relative density, specific gravity.
Why do we use specific gravity instead of density?The ratio of a substance's density to that of a standard reference material is known as specific gravity. It is an amorphous quantity. The word relative density is more frequently used since specific gravity, which has nothing to do with gravity, is unclear.If anything has a specific gravity, it will either float or sink. When tested against water, the specific gravity of a solid or liquid is compared; if it is less than one, it will float, and if it is greater than one, it will sink.The specific gravity test can be used to determine a patient's level of hydration or dehydration. It can also be used to detect whether renal tubular concentrating ability has been lost. Specific gravity values are not "abnormal." This test merely reports the urine's concentration.To learn more about density refer to:
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How is transcription similar to replication and how is it different?
Answers
Answer:
Transcription and replication are important processes that occur in cells but have distinct differences.
Similarities between transcription and replication:
1. Both transcription and replication involve the synthesis of nucleic acids. In replication, DNA is copied to produce an identical DNA molecule, while in transcription, DNA is used as a template to produce RNA.
2. Both processes occur in the nucleus of eukaryotic cells, although replication also occurs in the cytoplasm of prokaryotic cells.
Differences between transcription and replication:
1. Template: In replication, the entire DNA molecule serves as the template for copying. However, in transcription, only a specific DNA segment, called a gene, serves as the template for synthesizing an RNA molecule.
2. Product: Replication results in the production of an identical DNA molecule, while transcription produces an RNA molecule that is complementary to the DNA template.
3. Enzymes involved: Replication requires the involvement of multiple enzymes, including DNA polymerase, helicase, and ligase. Transcription, on the other hand, involves RNA polymerase, which catalyzes the synthesis of RNA from the DNA template.
4. Base pairing: During replication, DNA bases pair with their complementary bases (A with T and C with G) to produce an exact copy. In transcription, RNA bases pair with complementary DNA bases (A with U and C with G), resulting in an RNA molecule complementary to the template DNA strand.
Overall, while transcription and replication involve the synthesis of nucleic acids, they differ in terms of their templates, products, enzymes involved, and base pairing patterns. These processes are essential for cell function and crucial in genetic information transfer and maintenance.
Explanation:
The lungs remove the gas, __________________ and take in the gas, ________________.
Answers
Answer:
it removes the gas, hydrogen and takes in the gas, oxygen
A blank
serves as a long-term storage area for water or nutrients.
Answers
Answer:
A Reservoir
Explanation:
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PLEASE HELP !! ILL GIVE 40 POINTS ; PLUS BRAINLIEST !! DONT SKIP ANSWER.
Answers
Explanation:
I think the answer should be no.C
The concentration of salts in blood reamins relatively steady regardless of a person's diet. This situation best illustrates
homeostasis
autotrophy
evolution
life's organizational hierarchy
Answers
homeostasis is constant
Jeannie was studying heredity and drew the illustration shown below.
Image
What is Jeannie showing with the dark lines inside each cell?
Answers
Anything that can be seen inside the nucleus of a cell. Proteins and DNA are organised into genes, which form a chromosome.
What are chromosomes and how many are there?Chromosomes—threadlike structures made up of protein and a single DNA molecule—are used to carry genetic information from cell to cell. Chromosomes are housed in the nucleus of cells in both plants and animals, including humans.
Each cell normally has 23 pairs of chromosomes. Chromosomes, according to Sutton and Boveri's Chromosomal Theory of Inheritance, are the means by which genetic inheritance is conveyed. Rather, chromosomal behaviour includes segregation, independent assortment, and, on rare occasions, linkage; neither Mendelian genetics nor gene linkage are completely true.
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please help no links or i will report
Answers
Answer and Explanation:
The difference between a food chain and a food web:
Food Chain
- Only one possible direct line of energy going through organisms
- Consists of usually 4-6 organisms
Food Web
- Multiple links that branch off in a web-like form, with some organisms being interconnected with each other.
The answer is the third option: A food chain represents one possible pathway that energy and matter can take in an ecosystem. A food web contains multiple, interconnected food chains and describes how energy and matter moves through an entire ecosystem.
#teamtrees #PAW (Plant And Water)
If you buy 3kg of pasta for dinner party how many pounds of pasta are you actually preparing for dinner?
Answers
Given :
Mass of pasta buy for dinner party , M = 3 kg .
To Find :
How many pounds of pasta are you actually preparing for dinner .
Solution :
We have to convert 3 kg to pounds .
We know , 1 kg is equal to 2.2 pounds .
So , mass of 3 kg in pounds is :
\(M=2.2\times 3\ pounds\\\\M=6.6\ pounds\)
Therefore , 6.6 pounds of pasta is preparing for dinner .
Hence , this is the required solution .
What is the reason for the phase of no response immune depending on the of administre antigens With the explanation and analysis of the curve stage by stage please help me
Answers
The reason for the phase of no response is due to the time it takes for the immune system to recognize and respond to an antigen. When an antigen enters the body, it must be recognized and processed by immune cells before the body can mount an immune response. This recognition process can take time, particularly if the immune system has not encountered the antigen before.
During the phase of no response, the immune system is still actively processing and recognizing the antigen, but it has not yet produced an immune response. Once the immune system has recognized the antigen and developed a response, subsequent exposures to the antigen will elicit a more rapid and robust immune response due to the immune system's memory of the previous exposure.
The immune response to an antigen can be measured over time using an immune response curve. This curve typically shows a period of no response, followed by an initial response, and then a subsequent increase in response over time.
In the initial phase, there is a low level of immune response as the immune system begins to recognize and respond to the antigen. As the immune response develops, the level of response increases, reaching a peak at some point before eventually declining.
The shape and duration of the immune response curve can vary depending on the type and dose of antigen, the route of administration, and other factors. However, the initial phase of no response is a common feature of the immune response to new or novel antigens.
In summary, the phase of no response in the immune system occurs due to the time it takes for the immune system to recognize and process a new or novel antigen. This phase is typically followed by an initial response and subsequent increases in response over time. The immune response curve can provide insight into the nature of the immune response to an antigen, including the duration and magnitude of the response.
Please brainliest to support
highlight any five differences between living and non living things
Answers
Answer:
Hey there
Living things do all of the following:
Reproduce,
maintain homeostasis,
procese energy (take it in then expel it),
store some form of genetic information,
Have some form of awareness.
How are photosynthesis and cellular respiration related?
OA. Photosynthesis releases energy, while cellular respiration stores
energy.
B. Cellular respiration breaks down glucose, while photosynthesis
produces glucose.
OC. Cellular respiration is the process animals use to produce glucose,
while photosynthesis is the process plants use to produce
glucose.
D. Photosynthesis produces water molecules, while cellular
respiration splits water molecules apart.
Answers
Answer:
B. Cellular respiration breaks down glucose, while photosynthesis produces glucose.
Photosynthesis and cellular respiration are complementary processes that are interconnected and interdependent in the living world. Photosynthesis is the process by which plants, algae, and some bacteria convert sunlight, carbon dioxide, and water into glucose and oxygen. This process occurs in the chloroplasts of plant cells.
Explanation:
2. Which of the following methods will usually cause a
reaction to speed up?
Answers
Answer:
grinding one of the reactants into a powder.
Explanation:
this increases the surface area and hence there would be more chances of collisions happening. therefore reaction rate would increase
What is the only cephalopod with an external shell?
A. nautilus
B. cuttlefish
C. squid
D. octopus
Answers
Answer:
the only cephalopod with an external shell is A. nautilus
Answer:
a. nautilus
Explanation:
Nautiluses are the only cephalopod with an external shell.
Which could best be used to explain why bacteria can infect a person very quickly? outer capsule binary fission protective covering genetic recombination
Answers
Answer:
The answer is binary fission.
Explanation:
Binary fission is the process of reproduction by bacteria in which they divide into two cells.
They do this about every 20-30 minutes, this fast rate of reproduction could be best be used to explain why bacteria can infect a person very quickly.
Answer:
B. Binary Fission
Explanation:
Um. BeCaUsE
If humans are endangering one particular species in a habitat, how will interdependence affect the situation?A. The loss or reduction of one species could cause many others to be endangered as well.B. Interdependence will have no effect.C. When one species is endangered the others are able to work together to save it.D. The other species in the habitat will take over the functions that the lost species used to fill.
Answers
The correct answer is A. The loss or reduction of one species could cause many others to be endangered as well. Seldom human activies endanger an species alone, usually human alterations have an environmental effect, which affects differentially an arrray of species. Thus, species A is the most affected today, but if this continues, affectation will reach to other species.
why is almost every strand of HIV DNA different?
Answers
Almost every strand of HIV DNA is different because it is composed of a single-stranded RNA.
What is a DNA?This is referredt oas a deoxyribonucleic acid and ijs the geentoic masterial of most living organisms. In the case of HIV, each virion comprises a viral envelope and associated matrix enclosing a capsid, which itself encloses two copies of the single-stranded RNA genome.
The reverse transcription of the viral RNA genome into double-stranded DNA is part of the reasons why the HIV DNA is usually different thereby making it the correct choice.
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Can anyone help me with the length of time for each stage of Mitosis based on a 24 hour cell cycle?
Pls answer the question and do not put I don't know or something like that
Here is the table
Interphase 73 55 87
prophase 31 30 34
Anaphase 9 6 6
Telophase 5 5 3
Answers
Depending on how the chromosomes and spindle are physically, itosis is thought to have five stages. Prophase, prometaphase, metaphase, anaphase, and telophase are these stages.
What is Mitosis?Cytokinesis is the final physical cell division after telophase, it is occasionally regarded as the sixth stage of mitosis. Figure 8 displays every stage of mitosis as well as the interphase and cytokinesis phases that precede and follow.
Prophase, the first stage of mitosis, sees the recruitment of condensin and the start of the condensation process that lasts until metaphase. In the majority of species, prophase allows the resolution of the individual sister chromatids by mainly removing cohesin from the arms of the sister chromatids.
The spindle also starts to form during prophase when the centrosomes shift to their opposing poles and microtubules start to form from the double centrosomes.
Therefore, Depending on how the chromosomes and spindle are physically, itosis is thought to have five stages. Prophase, prometaphase, metaphase, anaphase, and telophase are these stages.
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Identify the following statement as qualitative (Qual) or quantitative (Quant)
Answers
Answer: (1) Quantitive (2) Qualitative (3) Quantitive (4) Quantitive (5) Qualitative
Explanation: Quantity is the amount or number of things, such as '3 eggs' or '5 notebooks'
Quality is more traits and characteristics, such as 'blue eyes' or 'soft pillow'
Hope this helps!
Which of the following scenarios involving pollutants will cause algal to blooms to occur
Answers
Answer:
The development and proliferation of algal blooms likely result from a combination of environmental factors including available nutrients, temperature, sunlight, ecosystem disturbance (stable/mixing conditions, turbidity), hydrology (river flow and water storage levels) and the water chemistry (pH, conductivity, ...
Explanation:
What does the process of photosynthesis produce?a) starch, which is metabolized into less complex molecules by dehydration synthesisb) protein, which is metabolized into less complex molecules by dehydration synthesisc) glycerol, which is metabolized into more complex carbohydrates by dehydration synthesisd) glucose, which is metabolized into more complex carbohydrates by dehydration synthesis
Answers
Photosynthesis
Is the process of conversion of inorganic matter into organic matter using sunlight.
The chemical reaction is:
sunlight + carbon dioxide + water → glucose + oxygen
Therefore, the correct answer is option D.
4. Where is rough endoplasmic reticulum located?
A. Cytoplasm
B. Ribosomes
C. Nucleus
D. Cell wall
Answers
Answer: Nucleus (C)
Explanation:
Rough ER is found throughout the cell but the density is higher near the nucleus and the Golgi apparatus. Ribosomes on the rough endoplasmic reticulum are called 'membrane bound' and are responsible for the assembly of many proteins. This process is called translation.