The linear order of amino acids in a polypeptide is the ________ structure of a protein.
A) primary
B) secondary
C) tertiary
D) quaternary
A) primary
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Fragile X syndrome is caused by a(n)
A) deletion. B) translocation. C) expanding triplet repeat. D) point mutation.
According to the intermediate disturbance hypothesis, ____
a. species richness becomes greatest in between disturbances of moderate intensity or frequency b. a disturbance is necessary during succession in order to stabilize the community c. community succession is highly predictable d. competition and other species interactions are the most important factors in shaping community structure e. a community reverts to a climax state after a disturbance
Which of the following statements is NOT true
concerning the results of Fred Griffith’s experiments? a. Mice injected with smooth (S) bacteria die. b. Mice injected with heat-killed, smooth bacteria die. c. Mice injected with heat-killed, smooth bacteria and live, rough (R) bacteria die. d. Mice injected with rough bacteria live. e. The rough bacteria received genetic material from the smooth bacteria.
Secretory IgA act protects the mucous membranes by:
A. Acting as an opsonin (a substance that mark the target for phagocytosis) B. Activating the helper T-cells C. Interfering with the adherence of the microbe to the mucous membrane D. Killing the invading microbe