Homeostasis is maintained using negative feedback loops. Which part of a negative feedback loop detects conditions?
A. response
B. effector
C. sensor
D. integrating center
E. stimulus
C. sensor
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Frozen methane molecules are called
A) anhydrous methane. B) anoxic methane. C) methane anhydrates. D) methane hydrates.
Vitamin D includes a group of steroid compounds that are converted to the steroid calcitriol in human kidneys
Calcitriol is a circulating steroid hormone that binds to Vitamin D receptors and the hormone binding to the Vitamin D steroid hormone receptor results in heterodimerization with a retinoic acid receptor and eventual regulation of calcium and phosphate in the blood stream. Which of the following DNA sequences is a likely HRE for Vitamin D receptor binding? A. NAGAACANNNTCAGCAN B. NAGGTCNNNATTTTAN C. NNTCCAGTTGACCTNN D. NNAGGTCANNNAGGACANN
Which of the following is TRUE of phospholipids that flip-flop across the lipid bilayer?
A. The process requires energy. B. The process occurs spontaneously, requiring no energy. C. The process requires an enzyme called flippase. D. The process requires energy and the flippase enzyme. E. The process occurs spontaneously and requires the flippase enzyme.
If the complex protein assemblage of the prokaryotic flagellum arose by the same general processes as those of the complex eyes of molluscs (such as squids and octopi), then _____
A) natural selection cannot account for the rise of the prokaryotic flagellum B) ancestral versions of this protein assemblage were either less functional or had different functions than modern prokaryotic flagella C) neither eyes nor flagella could have arisen by evolution because both are too complex to have evolved D) the need for more complex structure must have driven evolution