Refer to Figure 40-4. Which structure is most directly responsible for stimulating the release of calcium into the cytoplasm of the cell?
a. 2
b. 3
c. 4
d. 5
e. 6
D
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A strain of penicillin-resistant N. gonorrhoeae that does not have a plasmid is isolated. A lysate made from the bacterium cannot degrade penicillin in an in vitro assay. When a culture of this strain is grown in a solution that contains radioactive penicillin, the amount of penicillin found within cells is less than the amount found within cells from a nonresistant strain. The DNA sequence of the porin gene from the resistant strain does not have any mutations. What is the most likely mechanism of resistance in this strain?
A) A mutation in the mtr gene has occurred, resulting in fewer efflux pumps. B) A penA nonsense mutation has occurred. C) A penA missense mutation has occurred. D) The bacterial genome carries the penr gene.
What is the basic problem with cloning adult
animals?
a. obtaining enough DNA b. finding proper surrogates to carry the cloned embryos c. reprogramming the DNA d. obtaining DNA without mutations e. all of these are problems with cloning adult animals
When a moss spore lands on an appropriate site, it germinates into the first stage of the gametophyte called a(n)
A. prothallus. B. archegonium. C. antheridium. D. rhizoid. E. protonema.
In the syntenic dot plot of E. coli K-12 strains A and B, there is a single circled dot in the lower right corner of the plot. How do you interpret the position of this dot in terms of the gene orders of the two strains?
What will be an ideal response?