How do cells distinguish between estrogen and testosterone?
a. only male cells respond to testosterone and female cells respond to estrogen
b. estrogen is hydrophilic and binds to surface receptors, while testosterone is hydrophobic and binds to internal
receptors
c. estrogen and testosterone have similar functional groups but different basic structures that are easily
distinguished by their individual receptors
d. estrogen and testosterone have the same basic structures, but different side chains that are easily distinguished
by their individual receptors
e. estrogen and testosterone bind to different carrier proteins, which help receptors distinguish between the two
molecules
ANSWER: d
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_______________ are chemical substances produced in small quantities in one part of an organism and then transported to another part of the organism, where they bring about physiological responses.
A. Glycoproteins B. Photosynthates C. Hormones D. Heat shock proteins E. Pulvini
An enhancer is a sequence that increases transcription of a gene ____
a. when its orientation is the same as that of the gene it controls b. when it is located just downstream of the promoter c. when it is located just upstream of the promoter d. when it is distant from the gene it controls e. independently of its position, orientation, and distance from a promoter
Which vessel, A, B, C, or D, carries blood to the human lungs?
1.A
2.B
3.C
4.D
Which reaction is NOT an exergonic reaction?
a. protein synthesis b. explosion c. fire d. respiration e. movement