An embryo with meroblastic cleavage, extra-embryonic membranes, and a primitive streak must be that of
A) an insect.
B) a fish.
C) an amphibian.
D) a bird.
E) a sea urchin.
Answer: D) a bird.
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A plant mutant that shows normal gravitropic bending but does not store starch in its plastids would require a reevaluation of the role of _____ in gravitropism
A) auxin B) calcium C) statoliths D) light E) differential growth
When small molecules are linked together to form larger molecules, the increase in entropy typically comes from:
A. light. B. heat. C. work. D. gas. E. enzymes.
In gene regulation and control, induction can be defined as the:
a. mechanism of genetic control in which genes are induced only when the substrate to be degraded by enzymatic action is present. b. uptake of free DNA from the environment and recombination with the recipient's homologous DNA. c. mechanism of genetic control in which genes are not transcribed and therefore are not expressed in the presence of those target products in sufficient supply. d. change of the bacterial genotypes through the exchange of DNA from one cell to another.
What is the most compelling reason why DNA, rather than RNA, evolved to be the storage repository for genetic information in cellular life forms?
A. DNA molecules are more chemically stable than RNA molecules. B. DNA has deoxyribose rather than ribose. C. DNA is double-stranded rather than single-stranded.