The fertilization of an egg by a sperm produces a cell called a/an:
A) oocyte. B) ovum. C) gamete. D) zygote.
Answer: D
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The CRISPR system
A) facilitates homologous recombination through a complex system of proteins and clustered repeats. B) recognizes foreign DNA sequences that have previously entered the cell and directs the Cas proteins to destroy them. C) repairs DNA and increases DNA damage tolerance during times of stress. D) synthesizes gene transfer agents during stationary phase.
Contact inhibition is best explained by which of the following statements?
a. Contact between neighboring cells triggers reactions leading to inhibition of mitosis. b. As neighboring cells become more tightly packed together, their size is restricted and cytokinesis can no longer occur. c. As cell number increases, the protein kinases they produce compete with neighboring cells, inhibiting mitosis. d. As cell number increases, the level of waste products increase, consequently slowing metabolism leading to mitosis. e. As cell number increases, size restrictions inhibit protein synthesis.
Drugs like AZT, ddC, or ddI work against the AIDS virus because they
A) destroy viral proteins. B) look like hairpins to cause premature termination of viral mRNA. C) look like tRNAs and block viral translation. D) look like nitrogenous bases and block viral reverse transcriptase. E) prevent the virus from releasing its genome into the cytoplasm.
The Calvin-Benson cycle starts when ____
a. light is available c. electrons leave a photosystem II b. carbon dioxide is attached to RuBP