Which of the following enzymes is most active at an acidic pH?
A. amylase
B. lipase
C. trypsin
D. pepsin
E. chymotrypsin
D
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How does the heater organ of a swordfish produce heat?
A) The muscle contracts very rapidly, producing large quantities of heat. B) The myosin binds very weakly to the actin, utilizing large amounts of ATP that ultimately produces heat, but no tension. C) The sarcoplasmic reticulum releases and recovers large amounts of Ca2+, releasing heat as a by-product of these processes. D) The muscle fibers are rapidly generated and degraded, which produces large quantities of heat as a by-product.
The gallbladder is located on the posterior side of the:
A) spleen. B) pancreas. C) liver. D) stomach.
Following damage to axons nearby, oligodendrocytes
A. grow their own fibers to occupy the space. B. secrete growth-inhibitory molecules. C. do not secrete any chemicals. D. secrete growth factors.
Which sex cell determines the gender of the offspring?
A. Egg B. Sperm C. Neither sperm nor egg D. Sperm or egg