In the above figure which of the following is true?
a. Enough change in the dark blue phenotype is
seen to suggest that the population is evolving.
b. The light color phenotype is being selected for
by songbird predation.
c. Differential reproductive rate is having an effect
on evolution.
d. There is no evidence to support observable
evolution within this population.
e. All of these are true.
Answer: d
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Cell differentiation occurs due to ____
a. unequal cytoplasmic divisions b. the removal of different genes in different cell types c. polarization of the cell d. the presence of the X and/or Y chromosome in the cell e. changes in gene expression in different cell types
Which of the following is not a characteristic of an autosomal recessive disorder pedigree?
A. Affected children can have unaffected parents. B. Both males and females are affected with equal frequency. C. Two affected parents will always have affected children. D. Affected individuals with homozygous unaffected mates will have unaffected children. E. Heterozygotes have an affected phenotype.
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. Carbon dioxide is important for photosynthesis B. High temperatures are important for photosynthesis C. Photosynthesis generates oxygen D. Light is important for photosynthesis
You are studying regulation of a prokaryotic operon. Experiments show that expression of the operon is increased when levels of biosynthetic product from that pathway are low. Based on this information, what is a likely mode of regulation?
A. The product binds a repressor, allowing it to bind the operator. B. The product binds a repressor, preventing it from binding the operator. C. The product binds an activator, helping RNA polymerase to bind the promoter. D. The product binds to the biosynthetic enzymes, blocking them directly.