Shells of forams consist of organic matter reinforced by
a. silica.
b. cellulose.
c. calcium carbonate.
d. copper sulfate.
e. hydrogen sulfide.
C
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How does the SOS system simultaneously fix damage DNA and increase the mutation rate? How does the SOS system increase the survival of microorganisms?
What will be an ideal response?
Over the past several decades, populations of Staphylococcus aureus (a type of bacteria that infects wounds) have become resistant to penicillin
You run the following experiment: Reference: Ref 14-1 In a different set of experiments, you identify two kinds of mutations in S. aureus. The first type of mutation makes the bacteria more susceptible to antibiotic X; the second type of mutation makes it more resistant to antibiotic X. Which type of mutation is more likely to occur in the population? A. the first type (more susceptible) B. the second type (more resistant) C. It depends if the cell population has been exposed to antibiotic X. D. It depends if either type of mutation confers additional survival benefits to S. aureus. E. There is no difference in likelihood because the mutation is a random event.
During morphogenesis
a. cells divide. b. cells grow. c. cells migrate. d. tissues fold over. e. all of these occur.
In humans, the major histocompatibility (MHC) molecule is known as the
A) human lymphoid antibody. B) human leukocyte association. C) human lymphoid tissue. D) human leukocyte antigen. E) human leukocyte antibody.