Which of the following factors would tend to increase membrane fluidity?
A) a greater proportion of unsaturated phospholipids
B) a greater proportion of saturated phospholipids
C) a lower temperature
D) a relatively high protein content in the membrane
E) a greater proportion of relatively large glycolipids compared with lipids having smaller molecular masses
Answer: A
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Why does the pyramidal cell, above, illustrate the concept of information integration in the nervous system?
A. It has many dendrites and a single axon. B. It has a cell membrane. C. It is an excitable cell. D. It has a nucleus, in which transcription and translation occur. E. It has many dendrites and a single axon; it has a cell membrane; it is an excitable cell; and it has a nucleus, in which transcription and translation occur. F. All of these are parameters of the pyramidal cell that illustrate the concept of information integration.
The information in DNA is copied into molecules of ____
a. lipid b. carbohydrates c. hydrogen peroxide d. oxygen e. RNA
A gene that affects, prevents, or masks the expression of a gene at another locus is a(n) ____ gene
a. recessive b. dominant c. epistatic d. codominant e. pleiotropic
In many ways, the regulation of the genes of a particular group of viruses will be similar to the regulation of the host genes. Therefore, which of the following would you expect of the genes of a bacteriophage?
A) regulation via acetylation of histones B) positive control mechanisms rather than negative C) control of more than one gene in an operon D) reliance on transcription activators