Prehensile tails are found among
A) Old World monkeys.
B) most hominoids.
C) New World monkeys.
D) all primates.
Answer: C
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What is unusual about phage MS2 infection of Escherichia coli?
A) All proteins are synthesized simultaneously during infection so there are no early and late proteins. B) It attaches to the host's pilus rather than the cell's surface. C) It enters through a host cell porin. D) More than one MS2 phage can be present in an individual E. coli cell.
You are a doctor who examines a swollen and warm puncture wound on the hand of a patient. Because the wound was made by a rusty nail, you are concerned about infection by Clostridium tetani bacteria, which cause tetanus
You are relieved to see that the patient received a tetanus vaccine at her last checkup. The vaccine ____________. A. exposed the patient to C. tetani so that she contracted a mild version of tetanus. B. exposed the patient to deactivated C. tetani, so that her B cells would produce antibodies to the bacteria with minimal risk of contracting the disease. C. stimulated the production of mast cells by her bone marrow. D. exposed the patient to other types of bacteria, so that her immune system would be prepared for infection by prokaryotes.
Responses to heat stress include
a. reduction in muscle contraction. b. increased sweating. c. dilation of peripheral blood vessels. d. loss of salts and liquids. e. all of these.
The network of connective tissue fibers which pass through the tissues of the body and allow for the efficient movement of immune system cells is the
A) Reticuloendothelial system. B) Circulatory system. C) Lymphatic system. D) Extracellular fluid system.