While you are riding the ski lift up to the top of the mountain on a very cold day you start to shiver involuntarily. You know that the shivering is your body?s attempt to help regulate your body temperature and is an example of what type of mechanism?
A. sensitivity
B. homeostasis
C. energy utilization
D. evolutionary adaptation
Answer: B
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A pathogenic virus has a new mutation in one of the coat proteins, that just happens to resemble the structure of a normal human protein present in glial cells of the CNS. What do you predict may be an outcome of infection by this virus?
A. The initial response to the virus will be strong, but will then be shut down by immunological tolerance. B. An autoimmune disease of the brain may develop. C. The innate immune system will ignore the pathogen, but the acquired immune system will attack it. D. The membrane attack complex will be unable to burst the viral membrane.
The most likely reason that glucose dissolves in water is that it is ____
a. an ionic compound b. a polysaccharide c. polar and forms many hydrogen bonds with the water molecules d. an extremely unstable molecule e. highly nonpolar
The Cas9 nuclease is able to cleave target DNA at a single precise site by ________.
A. recognizing a palindromic sequence on the DNA and cleaving at that site leaving sticky ends B. associating with a single-stranded DNA molecule that binds to its complement on the genome to be cleaved C. using a guide RNA that hybridizes to a unique sequence on the target DNA molecule D. altering its active site to bind to and cleave any DNA sequence that is targeted
Thaumarchaeota is ubiquitous in
a. the soil. b. the marine water column. c. both the soil and the marine water column. d. freshwater.