As urine moves through a nephron, it is modified by ions, water, and other materials either being secreted into the fluid or by efflux of substances out of the urine
However, such modifications do not occur in which one of the following regions of the nephron? A) loop of Henle
B) collecting duct
C) Bowman's capsule
D) proximal tubule
E) distal tubule
C
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Which of the following was likely the host cell during primary endosymbiosis?
a. an archaeon b. an H2-producing bacterium c. an H2-using bacterium d. a photosynthetic bacterium
Why are the data shown in Figure 17.7 below consistent, but not conclusive of runaway sexual selection?
What will be an ideal response?
In a species such as elephant seals, in which males are significantly larger than females, the most likely mating system is:
a. polyandry. b. promiscuity. c. monogamy. d. It is impossible to predict the mating system with only this information. e. polygyny.
The caplike structure that covers the head of the sperm and releases enzymes that will help the sperm penetrate the egg is the
A. epididymis. B. vas deferens. C. acrosome. D. mitochondrion. E. nucleus.