The process of human X-chromosome inactivation in female cells:
A. is more common for the paternal X chromosome than the maternal X chromosome.
B. condenses one copy of the X chromosome into heterochromatin.
C. is necessary to ensure that only Y chromosome genes are expressed in some cells.
D. All of the choices are correct.
B
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Natural selection is one mechanism to change allele frequency in a gene pool, what is the name of the mechanism that fosters change in allele frequencies due to random chance?
A. Genetic Drift. B. Natural selection also fosters these changes. C. Non-Darwinian evolution. D. Neutral variation. E. Gene flow from one population to another.
Carbon and hydrogen have similar electronegativities and combine together to form hydrocarbon molecules. What type of bonds form between these atoms?
A. hydrogen. B. ionic. C. polar covalent. D. nonpolar covalent. E. electrostatic.
Light-dependent reactions in plants proceed in the _____
a. thylakoid membrane c. stroma b. plasma membrane d. cytoplasm
Discovery of the bacterial cytoskeletal protein FtsZ provided an important link in the evolution of cells since ________.
A. it is only present in E. coli B. it is unrelated to any eukaryotic proteins C. it has no known function D. is was also discovered in mitochondria and chloroplasts