HIV strains may differ by 10% within one person and by 35% in people around the globe. This is due to
A. the fact that HIV targets T cells.
B. the fact that HIV inserts its genome into the host genome.
C. both cellular and antibody-mediated responses.
D. HIV's high rate of mutation.
E. the fact that most people do not die from HIV infection.
Answer: D
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The choanocytes have a flagellum that moves water through the sponge and a collar that extracts food particles from the water. In what group have you encountered very similar cells before?
A. the choanoflagellates. B. the chytrids. C. the Euglenozoa. D. the charophytes. E. the Foraminifera.
Which gamete genotypes are expected to contribute to viable offspring when an individual is heterozygous for a paracentric inversion and crossing-over occurs as shown in the diagram? (The ? symbol represents a centromere.) (Select all that apply.)
A) ? A B C D E
B) ? a d c b e
C) e b c D E
D) ? A B C d e
E) A B C ? d a
F) e b c ? D E
G) A B C ? D E
H) a d ? c b e
J) ? A B C d a ?
The stacked grana are disk-shaped, interconnected membranous sacs embedded in the membrane of the stroma
Indicate whether the statement is true or false
A 38-year old woman is going to ovulate in about a week. For how long has the primary oocyte in her Graafian follicle been arrested at prophase I of meiosis?
A. About a day B. 3 weeks C. 38 years D. 1 week