Antibodies and killer T cells recognize HIV or HIV-infected cells by binding to short pieces of viral proteins displayed on the virus or the infected host cell. These short pieces of viral proteins are called ________
A) coat proteins
B) virosomes
C) proteosomes
D) epitopes
E) episomes
D
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Frog oocytes are a useful experimental system for studying transporters, because frog oocytes possess all of the following characteristics except
A) they are large, easily injected cells. B) they express all transporters known. C) they express injected heterologous mRNAs. D) they are relatively inexpensive and easy to obtain. E) they can be maintained in little more than pure water.
In which of the following ways are dendrites and axons similar?
A) The presence of branching B) both release neurotransmitters C) both have vesicles D) All of the above
Gene conversion results from
A. discontinuous replication. B. photoreactivation. C. mismatch repair. D. SOS repair. E. excision repair.
Answer the following questions true (T) or false (F)
1. Companion cells play a role in keeping xylem cells alive. 2. The male gametophyte generation develops largely within pollen grains of angiosperms. 3. The anther in a flower produces microspores.