Steroid hormones are lipids made from
A) amino acids.
B) cholesterol.
C) nucleic acids.
D) carbohydrates and amino acids.
Answer: B
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Explain the role of the following components in the experiment on carbon dioxide production.
(a) germinating corn seeds: (b) ungerminated (dry) corn seeds: (c) germinating, boiled corn seeds: (d) phenol red solution:
Which of the following pairs perform essentially the same function in cells?
A. aquaporins and contractile vacuoles B. plasma membranes and cell walls C. turgor pressure and proton pumps D. electrochemical gradient and osmosis
The ability of bacteria to transfer DNA from one individual to another in the same generation is called ________
a. vertical gene transfer b. mitosis c. meiosis d. horizontal gene transfer e. binary fission
The structural features of the small intestine that enable the absorption of nutrients are the
A. capillary beds. B. rugae. C. appendix. D. microvilli.