If a plasma membrane is analogous to the cell, which of the following is analogous to the animal body?
a. a reproductive system
b. a muscle system
c. the skin
d. a digestive system
Ans: c. the skin
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Gene technology has made it possible for bacteria to express human genes. Why is this possible?
All of the following are associated with replicons except
A) origin of replication. B) single-strand binding proteins. C) initiator proteins. D) minichromosome maintenance proteins. E) helicase loaders.
Considering the principle of complementary base pairing, you would expect an equal ratio of which two nitrogenous bases in a DNA molecule?
A) adenine and guanine B) thymine and cytosine C) cytosine and guanine D) guanine and thymine E) uracil and adenine
One type of archaeon, Haloquadratum walsbyi, is shaped like a postage stamp with dimensions of 2 µm x 3 µm x 0.25 µm. What advantage would this shape provide?
A. This shape increases the surface to volume ratio enabling more efficient nutrient uptake. B. This shape is more conducive to the formation of biofilm communities. C. This shape is difficult for phagocytic cells to attach to and engulf. D. This shape enables this bacteria to float on surfaces and obtain better light exposure.