What would happen if the chorion failed to secrete human chorionic gonadotropin?
A) The maternal elements of the placenta would fail to develop.
B) The fetal elements of the placenta would fail to develop.
C) Neural tube formation would not occur, and the embryo would have no central nervous system.
D) The embryo would be spontaneously aborted.
Answer: D
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The vomeronasal organ detects:
a. pressure b. light c. pheromones d. pain e. sound
In __________, an anus forms first. Fill in the blank(s) with the appropriate word(s)
Although both conditions share the common characteristic of elevated body temperature, hyperthermia is technically different from fever because ______.
a. hyperthermia is a condition in which the temperature is higher than in fever b. fever is a condition in which there is a change in the body's temperature setpoint c. hyperthermia is a condition in which pyrogens act to increase body temperature d. fever is a condition in which the metabolic rate is increased to a level higher than in hyperthermia
Selenium (Se) is an element required in the human body in trace amounts. Selenium is obtained through the diet and levels of selenium found in food depend greatly on the soil where it is grown
Once ingested and absorbed as selenate, it can become incorporated into a small number of polypeptides. These selenoproteins are formed when selenium replaces an element that is found in two of the twenty "standard" amino acids. Using your knowledge of atomic structure, the periodic table in Figure 2–7, and the structure of amino acids found in Panel 2–5, deduce which two amino acids may be converted to "seleno" amino acids and used to make selenoproteins.