Which floral structure is a female reproductive part?
a. anther
b. pollen sac
c. stigma
d. stamen
e. filament
ANSWER: c
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Which figure correctly illustrates the mechanism of action of the sodium-potassium pump? 
A. A B. B C. C D. D
Isoelectric focusing ________.
A. directly reveals the identity of unknown proteins in a complex mixture B. focuses the data gathered onto a specific protein or ORF C. separates proteins based on their size and shape D. separates proteins based on the pH at which they are electrically neutral
While looking under a microscope, you see two neighboring daughter cells. One of the cells contains three chromosomes, and the other contains five. The parent cell normally contains four chromosomes. What could be the reason for the different number of
chromosomes in the cells? A) Replication of DNA did not occur properly. B) The nuclear envelope did not dissolve, so mitosis could not occur at all. C) The division of sister chromatids of one chromosome did not occur properly during mitosis. D) The division of homologous chromosomes during meiosis II did not occur properly.
Which of the following statements about an ecosystem receiving a moderate level of continued disturbance are true? (Check all that apply.)A) A moderate level of continued disturbance predicts that most communities eventually reach an end-state or climax community.B) A moderate level of continued disturbance should lead to increases in species richness.C) A moderate level of continued disturbance tends to lead to the dominance of K-selected species.D) An example of a moderate level of continued disturbance would be a tree fall in a mature rain forest.E) A moderate level of continued disturbance should lead to all successional stages being present in the community at the same time.
What will be an ideal response?