Which of the following contains the most cells?
A) an organism
B) an organ system
C) an organ
D) tissue
A
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The following affect membrane fluidity EXCEPT
A. glycoprotein composition. B. cholesterol. C. phospholipid composition. D. the length of the phospholipid fatty acyl tail. E. the relative amounts of phospholipids containing saturated or unsaturated fatty acyl tails.
Researchers trying to cure a deadly virus have discovered that it can only infect cells that display specific carbohydrate chains on their exterior plasma membrane. An early drug trial incorporated an enzyme designed to digest all carbohydrates outside the cell. Researchers believed that without those carbohydrate markers, the virus would not be able to identify vulnerable cells. When tested, the drug caused massive tissue damage instead. What mistake did the researchers make?
a. They forgot that the primary component of plasma membranes is carbohydrates; the drug destroyed the cells’ membranes. b. Without their carbohydrate markers, the cells were identified by antibodies as being foreign and were destroyed. c. Carbohydrates attached to the plasma membrane also bind cells together; without them, the tissues fell apart. d. The enzymes released carbohydrates into the intercellular medium, allowing the virus to replicate faster.
In which stages do internal checkpoints occur during the cell cycle?
a. Near the end of G1 and at the G2–M transition b. Only during metaphase c. Near the end of G1, at the G2–M transition, and during metaphase d. Only at the end of the G2–M transition
If an oocyte is traveling through the oviduct, what stage must it be in?
a. meiosis I b. meiosis II c. primary oocyte d. follicular phase e. polar body