Which structure acts like an "invisibility cloak" and protects bacteria from being phagocytized?
A) slime layer
B) fimbriae
C) capsule
D) cell membrane
E) cell wall
C
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The epidermis of a nematode is derived from the:a
endoderm b. mesoderm c. ectoderm d. epithelium e. mesenchyme
Suppose that your father is heterozygous for a recessive disorder. Also suppose that you know your mom has two "good" alleles. What is the probability that you will have the disorder?
a. 75% b. 50% c. 25% d. 0%
Select the best response to the question. ? ?Which of the following is NOT a method of classifying antibacterial medications?
A) broad spectrum versus narrow spectrum B) mechanism of action C) bacteriostatic versus bactericidal D)aerobic versus anaerobic
Why do freshwater fish excrete a large amount of very dilute urine?
a. Because they live in a hypoosmotic solution, their cells take up excess water that must be excreted. b. Because they live in a hypoosmotic solution, their cells tend to accumulate a lot of solute that must be excreted. c. Because they live in a hyperosmotic solution, their cells take up an excess of water that must be excreted. d. Because they live in a hyperosmotic solution, their cells tend to accumulate a lot of solute that must be excreted. e. Because animals must live in an isoosmotic solution, they excrete solutes to make the concentration of solutes in the water equal to the concentration of solutes in their cells.