Oxygen will diffuse across gill membranes into the blood because _____
a. oxygen is in higher concentration in the blood compared to the water
b. oxygen is in lower concentration in the water compared to the blood
c. oxygen is in higher concentration in the water than in the blood
d. oxygen is in equal concentration in both the blood and the water
e. the gills attract oxygen chemically
ANSWER: c
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In the accompanying figure, the structure labeled “D” is the ____
a. muscle fiber b. sarcoplasmic reticulum c. mitochondria d. myofibril e. Z line
The letter “C” in the figure above represents
a. root apical meristem. b. dermal tissue. c. vascular tissue. d. ground tissues. e. ground, dermal, and vascular tissues.
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Which of the following is a special binding substance that enhances immugenicity and prolongs antigen retention at the injection site?
A. antibodies to toxin B. gamma globulin C. booster D. adjuvant E. "Trojan horse" recombinant vaccine