Which specific cells are infected by the HIV virus?
A. Red blood cells
B. Killer B cells
C. Helper T cells
D. All body cells are infected by the HIV virus
Answer: C
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Embryonic stem cells derived from blastocysts are pluripotent, and therefore useful in stem cell research because they ________
a. are viable under a wide range of laboratory conditions b. do not replicate and are therefore stable long-term c. can form all cells, tissues, and organs of the human body d. are specialized and therefore arrested in G0 e. function to replace damaged or diseased body parts in adults
The femur in a snake and pelvis in a whale are examples of
A. homologous structures. B. analogous structures. C. homeotic structures. D. vestigial structures. E. heterologous structures.
Once a virus establishes lysogeny, it may not switch to the lytic cycle at some later time.
Answer the following statement true (T) or false (F)
Nucleotides are the units of
A. ATP B. DNA and RNA C. Proteins D. Histones E. Carbohydrates