The filtrate formed by the nephrons in the kidney is NOT urine. The filtrate is first refined and concentrated by the processes of __________, which form the urine that leaves the body.
a. filtration and secretion
b. reabsorption and secretion
c. reabsorption and excretion
d. filtration and reabsorption
e. secretion and excretion
Ans: b. reabsorption and secretion
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"Plan B", the most widely used emergency contraceptive, delivers a large dose of which hormone?
a. estrogen b. luteinizing hormone c. oxytocin d. progesterone e. prolactin
Companion cell assisted loading of organic compounds is indicated by letter ____
a. A b. B c. C d. D
e. EThe prediction, during the early 1800s, that our human population would eventually reach a point where we cannot sustain ourselves has not occurred. Why?
A) The two world wars and the AIDS crisis caused such massive mortality that the human population has stabilized. B) The prediction was wrong; human populations can grow indefinitely. C) Technological advances unforeseen at that time increased the carrying capacity to a greater extent and faster than predicted. D) Humans continue to find ways to enhance environmental quality, thus enabling more people to be supported. E) Dramatic reductions in fertility rates ended population growth before the crisis point was reached.
Which of the following would be a monohybrid cross?
a) aa x Aa b) AA x aa c) Aa x Aa d) Aa x aa