In what way do the various membranes of a cell differ?
a. Phospholipids are found only in certain membranes.
b. Certain proteins are unique to each membrane.
c. Only certain membranes are constructed from molecules with dual solubility.
d. Only certain membranes of a cell are selectively permeable.
e. Some membranes have hydrophobic surfaces exposed to the cytoplasm, while others have hydrophilic surfaces
facing the cytoplasm.
ANSWER: b
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The structure of the cartilaginous and bony fishes that detects vibrations in the water is the
(a) anal fin. (b) operculum. (c) nostrils. (d) lateral line.
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The probability of obtaining a dominant phenotype from self-fertilization of a heterozygous individual is
A. 50% B. 25% C. 100% D. 75%
The Gram-positive bacterium Streptococcus pyogenes has several virulence factors, including the presence of a hyaluronic acid capsule, M protein, streptokinase, and hyaluronidase. Discuss how these factors contribute to this bacterium's ability to cause a variety of diseases.
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