A cell cycle checkpoint for S phase would likely inhibit progression through the cell cycle if _____
a. there are not enough proteins for division to continue
b. ATP supply in the cell is low
c. there is DNA damage
d. the temperature of the cell is too low
e. surrounding cells are dividing
ANSWER: c
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A mutation in a collagen gene is likely to affect the phenotype because
A) it is extremely rare. B) during meiosis, the chromosome that bears the mutation is more likely to enter a gamete than the chromosome that carries the wild type allele. C) collagen has a very precise three-dimensional structure, so nearly any disruption alters the overall conformation. D) people who use cosmetics with collagen silence collagen genes.
Follicle-stimulating hormone is secreted from the ________ gland
Fill in the blank(s) with correct word
Which of these are thought to have anti-cancer benefits?
A) Heterocyclic aromatic amines (HAs) B) Cruciferous vegetables such as broccoli C) Red meats D) Baked potatoes
Humans contract Chagas disease when the reduviid bug defecates while taking a blood meal and the parasites in the feces are rubbed or scratched into the bite wound or onto mucosal surfaces. Which stage in the blood infects the host cells?
a. Amastigote b. Epimastigote c. Trypomastigote d. Promastigote