Cells with ____ are able to harvest the greatest amount of energy from electrons
a. double membranes
b. photosystems
c. cytochromes
d. chloroplasts
e. nuclei
ANSWER: c
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Why isn't bacterial DNA digested by the restriction enzymes bacteria produce?
A) The sequence recognized and cleaved by a restriction enzyme is not found in the bacterial genome. B) Bacterial cells have high concentrations of ligase which immediately repairs the any sites that are cleaved. C) Methyl groups added to the bases of restriction enzyme recognition sites within the bacterial chromosome block cleavage. D) Bacterial DNA is modified with phosphate groups that prevent the function of restriction enzymes. E) Restriction enzymes are found in the cytoplasm and DNA is only in the nucleus.
Which of the following techniques is best suited to study protein interactions?
A) PCR B) The yeast two-hybrid system C) Restriction mapping D) RT-PCR E) Southern blotting
Most disinfectants work better in ________ solutions.
a) cold b) warm c) acidic d) organic
Patients who suffer from xeroderma pigmentosum (XP) have a defective mismatch repair system.
Answer the following statement true (T) or false (F)