Which of the following is a lipophilic primary message that crosses the plasma membrane and interacts with a cytosolic receptor?
A) estrogen
B) EGF
C) pertussis toxin
D) TGF?
E) PDGF
Answer: A
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Which of the following statements explains why animals are less likely than plants to speciate by polyploidy?
A) Animals self-fertilize less often than plants, so diploid gametes are less likely to fuse. B) Animals have better mechanisms for repairing chromosomes than plants have. C) Animals are more mobile, so they have more effective prezygotic isolating mechanisms. D) Animals are more mobile, so populations get separated far less often. E) Animals use a more rigorous form of meiosis than plants, making diploid gametes much more difficult to form.
Given the half-life of radioactive carbon of 5730 years, if a sample from an archaeological site is analyzed, and it is determined to have 1/4 of the amount of 14C that a living organism would have, describe how you would go about aging this fossil
What will be an ideal response?
The major histocompatibility complex (MHC) is an example of a(n)
A) glycoprotein. B) polysaccharide. C) phospholipid. D) organelle.
If all available enzyme molecules are binding substrate and converting it to product as rapidly as possible, the reaction is said to be proceeding at ________ velocity.
A. optimal B. terminal C. infinite D. maximal