The major virulence factor of Corynebacterium diphtheriae that causes serious systemic effects is its ________.
A. endospores
B. capsule
C. exotoxin
D. metachromatic granules
E. endotoxin
Answer: C
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Which of the following statements about the sodium-potassium pump is false?
a. Most cells of the body have sodium-potassium pumps b. The sodium-potassium pump moves sodium ions from inside the cell to outside, while importing potassium ions from the extracellular fluid. c. The sodium-potassium pump is a form of gated passive transporter. d. The transporter changes shape in response to binding of its target molecules.
The cell walls of plant cells and prokaryotic cells are structurally identical
a. true b. false
Karyotyping involves taking pictures of chromosomes during
a. prophase. b. telophase. c. metaphase. d. interphase. e. anaphase.
How does DNA move during gel electrophoresis?
A) The DNA moves toward the negative electrode. B) Larger pieces of DNA move at a faster rate. C) DNA moves at a constant rate, regardless of fragment size. D) Smaller pieces of DNA move faster toward the positive electrode.