Which of the following is the signal that functions to begin transcription and consists of a sequence on the DNA?
A) mRNA B) vector C) exon D) promoter
Answer: D
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Hormones are chemical substances produced in one organ that are released into the bloodstream and affect the function of a target organ. For the target organ to respond to a particular hormone, it must _____
A) modify its plasma membrane to alter the hormone entering the cytoplasm B) be from the same cell type as the organ that produced the hormone C) experience an imbalance that disrupts its normal function D) have receptors that recognize and bind the hormone molecule
In the late 1870s, Charles Darwin and his son, Francis, discovered that if the tip of the grass was covered, phototropism did not occur, even though the rest of the grass was exposed to light. However, if the rest of the plant was covered and only the tip exposed to light, the grass bent a few centimeters below the tip. Which of the following was sensing the light?
A. auxin-detecting cells in the tip of the grass B. auxin-producing cells in the tip of the grass C. auxin-producing cells a few centimeters below the tip of the grass D. auxin-detecting cells a few centimeters below the tip of the grass
Constitutive genes code for proteins that are needed for survival
__________________ Indicate whether the statement is true or false.
The ultimate electron acceptor from complex II is ________.
A) Q B) QH2 C) cytochrome c D) O2 E) FMN