Which types of ratios are likely to occur in crosses (F2 ) when one is dealing with two interacting, epistatic gene pairs?
What will be an ideal response?
9:7, 9:3:4, 12:3:1, 15:1
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Suppose that the osmotic response element is in a promoter joined to the coding region of luciferase,
and this composite gene is in cultured renal medulla cells. The cells should glow when they are placed in a medium that is ____ to the cells.
a. hyperosmotic b. hypoosmotic c. hypoosmotic or isoosmotic d. isotoosmotic e. hyperosmotic or isotoosmotic
Most of the body's muscle tissue is
a. smooth muscle. b. skeletal muscle. c. cardiac muscle. d. involuntary muscle. e. digestive muscle.
The smallest unit that has all of the characteristics of life is the
(a). cell. (b). tissue. (c). organ. (d). organ system. (e). organism.
Which of the following statements concerning nucleic acids is CORRECT?
A. Nucleic acid strands are held together by hydrogen bonds between adjacent carbohydrates. B. Cellular DNA is double stranded. C. All viruses have DNA genomes. D. The nucleic acid polymer is composed of peptide bonds. E. There are three naturally occurring purines in nucleic acids.