If a protein is supposed to consist of the amino acid sequence valine-valine-histidine and instead it consists of the sequence alanine-valine-histidine, most likely
A. there has been a point mutation in the first codon.
B. there has been a point mutation at the eighth base pair.
C. the change will not be noticed.
D. this is a gross mutation; the organism will not survive.
D. this is a gross mutation; the organism will not survive.
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The hundreds of species of Drosophila in Hawaii exhibit different mating rituals. This isolating mechanism is
A. prezygotic and behavioral. B. prezygotic and temporal. C. prezygotic and geographical. D. postzygotic and mechanical. E. prezygotic and ecological. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about reproductive isolation mechanisms? 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?
The hormones that are most directly involved with the process of birth are
a. estrogen and oxytocin. b. oxytocin and prostaglandins. c. oxytocin and progesterone. d. prolactin and estrogen. e. prostaglandin and progesterone.
In a population characterized by type III survivorship, the probability of survival ____ with age
a. increases
b. decreases c. does not change d. first decreases then increases e. first increases then decreases
F. F. Blackman performed experiments to investigate the effects of various factors on photosynthesis. In one of his experiments, Blackman found that if light intensity was low, photosynthesis could be accelerated by increasing the amount of light, but not by increasing the temperature or carbon dioxide concentration. What can you conclude from this specific experiment?
A. Photosynthesis generates oxygen. B. Carbon dioxide is important for photosynthesis. C. High temperatures are important for photosynthesis. D. Light is important for photosynthesis.