The difference in cell wall structure of Mycobacterium and Nocardia compared to the typical gram-positive bacterial cell wall structure is

A. the presence of more peptidoglycan.
B. the presence of lipopolysaccharide.
C. the predominance of unique, waxy lipids.
D. the rapid decolorization during staining.
E. All of these choices are correct.


Answer: C

Biology & Microbiology

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Albinism in most animals is an epistatic trait characterized by a lack of melanin pigment in the eyes, skin, and hair. If the allele for albinism is a, the allele for brown coat color is B, and the allele for red coat color is b, which of the following genotypes would result in an albino cow?

A. AaBb B. aaBB C. aabb D. Aabb E. aaBB and aabb

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Which cell organelle regulates the movement of molecules in and out of the cell?

a. the nucleus b. the ribosome c. the plasma membrane d. the cytoplasm

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The greatest number of bacteria forming the normal flora are found:

A. On the skin B. In the mouth C. in the large intestine D. in the vagina E. in the nose

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Which of the following is NOT true after a man has had a vasectomy?

A. The vas deferens still transports sperm to the urethra. B. The interstitial cells can still release hormones. C. The uterine tube will not be affected.  D. The semen will not contain sperm. E. Bulbourethral glands are not affected by the operation.

Biology & Microbiology