A retrovirus is a virus that has _______________ as its genetic material.
A. DNA
B. RNA
Ans: B. RNA
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Rat-bite fever caused by S. minus can be differentiated from that caused by S. moniliformis by:
a. chills, fever, headache, vomiting, and of-ten severe joint pains. b. a granulomatous lesion. c. septic arthritis. d. endocarditis.
Unlike plants, fungi, and bacteria, animal cells
cannot resist volume increases in hypotonic environments. This is because unlike those other organisms, animal cells
a. do not have central vacuoles. b. do not have cell walls. c. do not have pumps that can actively pump out excess fluid. d. are smaller than those other cells and thus cannot handle large increases in volume. e. have relatively more solutes
Once an amino acid has been attached to the appropriate tRNA, the tRNA is called a(n) ________, and the amino acid is said to be ________
Fill in the blank with correct word.
The site of communication between a neuron and a muscle fiber is called a
A) Z disc. B) myofibril. C) sarcomere. D) neuromuscular junction.