Peptide hormones ______.

a. are hydrophilic
b. cannot enter the target cell
c. bind to a receptor on the cell surface
d. all of these


Answer: d. all of these

Biology & Microbiology

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Harmful amounts of ________ may be absorbed by the leaf cuticle as well as by carotenoids and flavonoids.

A. carbon dioxide B. blue and red light waves C. chlorophyll D. xanthophylls E. UV radiation

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Growth hormone

What will be an ideal response?

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Most of the electrons removed from glucose by cellular respiration are used for which of the following processes?

a. reducing NAD+ to NADH in glycolysis and the citric acid cycle b. producing a proton gradient for ATP synthesis in the mitochondria c. driving substrate-level phosphorylation in glycolysis d. the first 2 choices are correct e. the 2nd and 3rd answers are correct

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In humans, the number of sperm cells required to produce a pair of identical twins is

A. 1 B. 2 C. 3 D. 4

Biology & Microbiology