A significant reduction in the amount of which gas would allow more ultraviolet radiation to reach the
earth's surface?
a. carbon dioxide
b. methane
c. ozone
d. cyanide
e. oxygen
C
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Cyanide poisons mitochondria by blocking the final step in the electron transport chain. Human red blood cells placed in an isotonic solution containing cyanide are likely to _____
A) retain the normal cell shape, but the mitochondria will be poisoned B) lyse as the cyanide concentration increases inside the cell C) switch to anaerobic metabolism D) become unable to carry oxygen E) be unaffected
Which observation below provides evidence that differentiated cells retain all the genes of developing cells?
A) Developing cells have many mRNA transcripts that can hybridize with DNA from mature cells. B) Differentiated cells generally synthesize a specific group of proteins. C) Nuclei from mature cells can direct the development of an entire individual. D) Not all mature cells are capable of differentiation.
In humans, the sickle-cell trait is caused by a single defective allele, but sickle-cell disease only occurs in individuals that are homozygous for the sickle-cell allele. A man and woman each carry the trait, but do not have sickle-cell disease. What is the probability that their first two children will both have sickle-cell disease?
A. 1/16 B. 1/8 C. 1/4 D. 3/8 E. 1/2 Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain? Gather Content · What do you already know about monohybrid crosses? About determining the probability of two independent events? Consider Possibilities · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
What is a muscle fiber?
A. A single cell of a muscle B. A group of muscle cells that make up the same muscle group C. The myosin that makes up the contractile unit of a muscle cell D. The connective tissue outer covering of a muscle