Salmon are well known for their ability, after growing to maturity in the ocean, to find their way back to the streams where they were born in order to breed. For this kind of navigation, they likely:
A. use magnetotaxis only.
B. use map information only.
C. rely on kinesis only.
D. use a variety of environmental cues.
E. use only a combination of magnetotaxis
and kinesis.
D
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Most viruses?
A. infect only a few closely related species. B. infect only animal cells. C. cannot infect living cells. D. infect only plant cells. E. infect a wide variety of organisms.
Although useful so far only against some rare forms of cancer, interferons activate ____
a. B-lymphocytes b. dendritic cells and B-lymphocytes c. natural killer cells and cytotoxic T cells d. helper-T lymphocytes and dendritic cells e. fibroblasts and B-lymphocytes
The hypothesis that organic molecules formed near deep sea hydrothermal vents is called the:a
iron-sulfur world hypothesis. b. iron-clay hypothesis. c. organic sea hypothesis. d. prebiotic soup hypothesis. e. sulfur vent hypothesis
Which of the following is NOT considered a peripheral lymphoid tissue?
A) bone marrow B) spleen C) appendix D) adenoids E) tonsils