Master Biology with Fun Quizzes & Brain Teasers!

What molecule is both one of the very initial substrates and one of the final products of the Krebs cycle
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Metabolic acids which are derived from metabolic wastes are more commonly referred to as ______ acids
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__________ intake is important to athletes because of its role in transporting oxygen in blood and muscle cells.
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Absolute refractory period B. Repolarization C. Action potential D. Depolarization E. Relative refractory period _____ 18. The neuron cannot respond to a second stimulus, no matter how strong. _____ 19. The interior of the cell becomes less negative due to an influx of sodium ions. _____ 20. The specific period during which potassium ions diffuse out of the neuron due to a change in membrane permeability. _____ 21. Also called a nerve impulse transmitted by axons. _____ 22. An exceptionally strong stimulus can trigger a response.
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A. Spatial summation B. Threshold stimulus C. Subthreshold stimulus D. Temporal summation _____ 9. Numerous nerve impulses arriving at a synapse at closely timed intervals exert a cumulative effect. _____ 10. Stimulation of a postsynaptic neuron by many terminals at the same time. _____ 11. An insufficient stimulus. _____ 12. Any stimulus below this intensity will result in no response in a neuron.
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In a heterozygous individual for a certain trait, the dominant allele gives syndactylism. What is the masked, recessive trait in this individual
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If both mother and father are heterozygous for a trait showing simple dominance, what is the probability that one of their future children will show that trait
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If two double-stranded DNA molecules are used at the beginning of a polymerase chain reaction (PCR) process, how many double-stranded DNA molecules can be obtained after two cycles
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2.What feature of the adaptive immune system decreases the amount of time it takes for the body to respond to a particular antigen
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In eukaryotic cells, the RNA is processed before it leaves the nucleus. This processing __________. View Available Hint(s)for Part A includes the removal of introns before a cap and tail are added to the RNA molecule, forming the start site for translation once attached to the ribosome includes the removal of exons before the addition of a cap and tail, which assist in binding of the ribosome includes the addition of a cap and tail, which help in exporting the mRNA molecule from the nucleus, and the removal of exons includes the addition of a cap and tail, which protect the mRNA molecule from enzymatic attack, and the removal of introns
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