Which of the following is NOT a nitrogenous base in DNA?
A.) Adenine
B.) Thymine
C.) Guanine
D.) Uracil
Ans: D.) Uracil
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Which of the following prevents some bacteria from adhering to mucosal surfaces?
A. IgD B. IgE C. IgM D. IgA
A newly developed antibiotic drug shows promise by inhibiting prokaryotic 70S ribosomes in initial studies. However, when animal studies are begun, it's noted that it also inhibits growth of animal cells
Aren't prokaryotic ribosomes different from eukaryotic ribosomes? How can this be happening? A. Perhaps the ribosomes aren't as different as we thought, so a drug can affect and impair both of them. B. While the proteins made in the cytosol of eukaryotic cells are, indeed, produced from the 80S eukaryotic ribosome, mitochondria and chloroplasts possess 70S ribosomes. This drug might be impairing the activity of chloroplasts in animal cells. C. While the proteins made in the cytosol of eukaryotic cells are, indeed, produced from the 80S eukaryotic ribosome, mitochondria and chloroplasts possess 70S ribosomes. This drug might be impairing the activity of mitochondria in animal cells. D. Perhaps the scientists accidently combined their cultures of animal and bacterial cells-this might indicate an impairment in growth in the culture. In reality, it's still just impairing the bacterial cells.
As summer comes to the tundra, what will
occur?
a. A long growing season will begin. b. The surface layer will thaw and pools of water will form. c. The permafrost thaws out. d. Birds will begin their southerly migration. e. more than one of these
Your neighbor tried to lift a propane tank onto the back of his pickup truck and ruptured the cartilaginous disk between two of his vertebrae. What is most likely to happen to him?
A) He will have bloody stools. B) He will suffer pain from a compressed spinal nerve. C) He might have severe brain damage. D) His spinal nerve cord will enlarge.