Which of the following lacks a cell wall?
A) Borrelia
B) Mycoplasma
C) Mycobacterium
D) Clostridium
E) Nocardia
B
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The most general of the pituitary hormones, in that it may affect almost any cell in the body, is
a. the adrenocorticotropic hormone. b. the thyroid-stimulating hormone. c. gonadotropin. d. somatotropin. e. prolactin.
Which sentence describes the width of a DNA double helix?
a. The width is greater where purines are present than where pyrimidines are present. b. The width is narrower where adenine is present than where cytosine is present. c. The width is constant. d. The width varies randomly.
Staphylococcus aureus toxin is
A. heat-stable. B. an exotoxin. C. an endotoxin. D. heat-sensitive. E. heat-stable AND an exotoxin.
The prokaryotic chromosome is comprised of a ____
a. highly folded mass of a single, linear molecule of DNA b. loosely folded mass of a single, linear molecule of DNA c. highly folded mass of a double, circular molecule of DNA d. highly folded mass of a single, circular molecule of DNA e. loosely folded mass of a single, circular molecule of DNA