Which of the following organisms produce
genetically engineered chymotrypsin, used in
the food industry?
a. a pig
b. a bacterium
c. a yeast
d. a sheep
e. a cow
B
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Which of the following is(are) shared by both prokaryotic and eukaryotic cells?
a. cell wall b. nucleus c. cytoplasm d. organ systems
The oldest mammals were large, dinosaur-like creatures that flourished over 600 million years ago.
Answer the following statement true (T) or false (F)
Which statement about HIV is FALSE?
a. HIV infection results in a dramatic decline in the T helper cell population. b. The first cells targeted by HIV are dendritic cells. c. T cytotoxic cells are the main cells that attack HIV. d. Dendritic cells transport HIV from the mucosa to the lymph nodes. e. HIV attaches to the CD4 component of TH cells.
The nitrogenous base that is only found in DNA and not in RNA is:
A. adenine. B. cytosine. C. uracil. D. guanine. E. thymine.