The figure above illustrates one possible ____
structure of ____.
a. primary; proteins
b. primary; carbohydrates
c. primary; lipids
d. secondary; proteins
e. tertiary; proteins
D
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During sexual arousal, the _____ secrete a small amount of a clear alkaline fluid, which appears as droplets at the tip of the penis before ejaculation occurs.
A. vas deferens B. seminal vesicles C. Cowper's glands D. interstitial cells.
For each acetyl CoA molecule that enters the citric acid cycle, two CO2 molecules are produced
__________________ Indicate whether the statement is true or false.
Many vitamins are important ________ of enzymes.
A. protein cofactors B. coenzymes C. allosteric inhibitors D. competitive inhibitors E. activators
In which period of evolution, in the Cenozoic era, would you find Homo sapiens?
A. Cretaceous B. Neoprene C. Jurassic D. Quarternary E. Paleogene