Under what circumstance might measuring the frequency of homozygous recessive genotypes lead to
erroneous predictions of allele frequencies in a population?
a. the population is under Hardy-Weinberg equilibrium
b. the population is affected by heterozygote advantage
c. the population has undergone genetic drift in the past
d. the population is in a stable phase of punctuated equilibrium
e. the population is affected by frequency-dependent selection
B
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Which of the following macromolecules leaves the nucleus of a eukaryotic cell through pores in the nuclear membrane?
A) DNA B) amino acids C) mRNA D) phospholipids
Which of the following statements is most likely to be true in the case of the feedback-regulated enzymatic pathway shown?
Multiple myeloma is a plasma cell tumor in which a clone of malignant plasma cells produces large amounts of immunoglobulin. With all this excess immunoglobulin, how can a person with multiple myeloma be immunodeficient?
A. All the immunoglobulin produced is most likely specific to one antigen. This limits the ability to respond to the diversity of antigens we encounter. B. The multiplication of the malignant plasma cells may crowd out normal production of other immune cells required for protective responses. C. The massive overproduction of immunoglobulin impairs the kidneys, preventing production of the correct hormones from the kidneys to balance immune system cell production from the bone marrow. D. Through a negative feedback loop, the large amount of immunoglobulin tricks the immune system into thinking it's making a strong response that is needed. As such, it shuts down production of other responses that might truly BE needed to fight off a pathogen. E. All the immunoglobulin produced is most likely specific to one antigen. This limits the ability to respond to the diversity of antigens we encounter AND the multiplication of the malignant plasma cells may crowd out normal production of other immune cells required for protective responses.
The pollen tube grows from the ________ to the ________, where it eventually fertilizes the egg.
A. petal; ovary B. sepal; filament C. anther; style D. stigma; ovule