How do DNA repair enzymes typically find mismatched base pairs?
a. by scanning for Okazaki fragments
b. by scanning for distortions in the newly synthesized chain
c. by scanning for missing hydrogen bonds
d. by scanning for unsealed nicks in the DNA strands
Answer: b. by scanning for distortions in the newly synthesized chain
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Boris has many tattoos and has recently started having a yellowish tinge to his skin. What should he be tested for before he donates blood?
A) HIV B) cirrhosis C) hepatitis D) Helicobacter pylori
Restriction endonucleases in bacteria may have evolved in order to ________.
A. carry out natural genetic engineering B. use nucleic acids as a food (energy) source C. protect the bacteria from infection by viruses D. All of the choices are correct.
If alcohol is taken on a full stomach, the rate at which the BAC increases is (slower/higher) than when alcohol is taken on an empty stomach.
What will be an ideal response?
Why are epithelial membranes not very thick?
A. Epithelial tissues can only reach a certain thickness because their growth is constrained by microtubules inside the cell membrane. B. Thick epithelial tissues would collapse due to the drying effect of the environment. C. Epithelial tissues are required to support other cells growing on top of the tissue. D. Epithelial tissues are programmed to stop dividing after only a few cell cycles. E. Epithelial tissues play a critical role in transport, and must be thin to allow diffusion to occur.