The benefit provided by all hearts with two atria is
A. not all the blood has to pass through both sides of the heart.
B. there is an extra place to store blood when the animal is at rest.
C. that there are two muscular regions for pumping blood out of the heart to different organs.
D. that blood is pumped into body tissues at high pressure.
E. complete separation of oxygenated and deoxygenated blood.
D. that blood is pumped into body tissues at high pressure.
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The functional unit of the kidney is the
(a) renal pelvis. (b) ureter. (c) cortex. (d) nephron.
All types of internal fertilization require
A. specialized anatomical structures. B. physical joining of male and female. C. transfer of a spermatophore to the female reproductive tract. D. a terrestrial environment.
In the figure shown above, identify the bond that is cleaved when this molecule is coupled with an
endergonic reaction to drive the endergonic reaction to completion. (The molecule of water also required for this reaction is not shown.)
a. A b. B c. C d. D e. E
What is the function of the structure labeled A in Figure 25-1?
a. to adhere to surfaces or other bacteria
b. to prevent phagocytosis
c. support and protection in hypotonic conditions
d. transmission of DNA between bacteria
e. locomotion