The male and female reproductive systems of an adult each include
A) gonads, tubes, gametes, hormones and secretions.
B) ambiguous structures that give rise to male or female structures at puberty.
C) spermatids, polar bodies, and oocytes.
D) 200 to 600 million spermatocytes and a few thousand oocytes.
A) gonads, tubes, gametes, hormones and secretions.
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The cells that secrete the acidic components of stomach juices _____
A) are the chief cells of the stomach B) are the parietal cells of the stomach C) are not needed for the transformation of pepsinogen to pepsin D) are in the lumen of the stomach E) add secretions along the esophagus
Which of the following statements is true regarding CO2 capture and the Calvin cycle in CAM plants? Select all correct choices
A. CO2 capture occurs at night and the Calvin cycle takes place in the day. B. CO2 is captured in mesophyll cells and the Calvin cycle occurs in bundle-sheath cells. C. CO2 capture and the Calvin cycle both occur in the same cell. D. CO2 capture and the Calvin cycle both occur during the day (in sunlight).
In order to prove that a bacterium is pathological according to Koch’s postulates, the ____
a. bacteria must be present in most cases of the disease b. bacteria must be isolated from the infected host and grown in mixed culture c. specific disease must be induced when a pure culture of the bacteria is introduced into a healthy host d. bacteria must be isolated from a transfer host e. bacterium must produce spores that can be transmitted from one individual to another
Four of these five choices are substances that release ozone-destroying chemicals. Select the exception
a. evaporating fossil fuels b. coolants c. solvents d. plastic foam e. propellants in aerosol cans