The immotile sperm develop motility in about 18 hours after arriving at the long, coiled tube called the
A. vas deferens
B. seminiferous tubules
C. epididymis
D. testis
C. epididymis
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Which statement best describes the difference in responses of effector B cells (plasma cells) and cytotoxic T cells?
A) B cells confer active immunity; cytotoxic T cells confer passive immunity. B) B cells kill pathogens directly; cytotoxic T cells kill host cells. C) B cells secrete antibodies against a pathogen; cytotoxic T cells kill pathogen-infected host cells. D) B cells carry out the cell-mediated response; cytotoxic T cells carry out the humoral response. E) B cells respond the first time a pathogen is present; cytotoxic T cells respond subsequent times.
The number 6 carbon of mannose is exposed:
a. In the nucleus b. In the rough endoplasmic reticulum c. In the smooth endoplasmic reticulum d. In the medial phase of the Golgi e. None of the above
The structures responsible for detecting linear movement relative to the pull of gravity are labeled __________ in Figure 43-2
a. 1 and 3
b. 4 and 6
c. 3 and 5
d. 1 and 6
e. 4 and 7
Which of the following is unlikely to trigger degradation of a eukaryotic mRNA in the nucleus?
a. aberrant splicing b. presence of a nonsense codon c. lack of splicing d. misfolding of the mRNA e. lack of a poly(A) tail