________ are a type of connective tissue cell that secrete proteins, especially collagen, and are active in wound healing.
A. Bone cells
B. Cartilage cells
C. Fibroblasts
D. Erythrocytes
Answer: C
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Diphtheria is caused by a member of which of the following genera?
A. Propionibacterium B. Mycobacterium C. Corynebacterium D. Nocardia
A closed-circular DNA in its relaxed form has a linking number (Lk) of 500 . What will happen to the linking number of this molecule if the DNA is denatured by heat?
A. Lk will increase. B. Lk will decrease. C. Lk will stay the same. D. Lk becomes undefined. E. None of these choices is correct.
If a virus-injected gene interrupts a growth control gene, ____ could result
a. diabetes b. cancer c. hemophilia A d. sickle-cell anemia e. heart attack
Which of the following gases was the least abundant in the earth's atmosphere 3.5 billion years ago?
a. carbon dioxide b. oxygen c. water vapor d. hydrogen e. nitrogen