You perform an experiment whereby you place a compound into a pond, and after some time, you find increased numbers of "masculinized" females from all species of fish. What can you predict about this compound?
A) It must have a similar structure to that of estrogen.
B) It may activate the enzyme aromatase.
C) It binds to and activates estrogen receptors.
D) It may be structurally similar to testosterone.
D
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A patient should be placed in a private room that has monitored negative air pressure if he or she is infected with which organism?
a. H. influenzae b. Mycoplasma pneumonia c. Parvovirus B19 d. Mycobacterium tuberculosis
Which process occurs in the nucleus in eukaryotic cells?
1.transcription 2.translation 3.protein synthesis 4.formation of polypeptide bonds
Demographic studies include all of the following except what?
A. age structure B. growth rates C. mortality and survivorship curves D. sex ratio E. measurements of interspecific competition
The eggs released by sponges during reproduction have proteins on their surfaces that prevent sperm from different sponge species from binding to the eggs. What type of reproductive isolation would include this example?
A) gamete compatibility B) hybrid inviability C) mechanical reproductive isolation D) behavioral reproductive isolation