Characteristics usually associated with life include all of the following except
a. motility.
b. responsiveness to stimuli.
c. reproduction.
d. lack of change from generation to generation.
e. a high degree of organization.
D
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Answer the following statements true (T) or false (F)
1. If a researcher determines that 25% of a liver cell's total genome encodes genes for metabolic enzymes, then he/she should assume that metabolic enzymes make up 25% of the total protein composition of the cell. 2. Liver and muscle cells have different sets of genes. 3. A single pre-mRNA can be alternatively spliced into more than one type of mRNA. 4. If an acetyl group is added post-translationally to a protein, it can be subsequently removed.
A research laboratory is attempting to collect the content of human red blood cells. The type of solution researchers should use to cause blood cells to lyse (burst) would be
A. hyperosmotic. B. isosmotic. C. hypoosmotic. D. osmotic.
The replication illustrated here is termed
a. dominant. b. recessive. c. semiconservative. d. conservative. e. hemiconservative.
Cells change shape during embryogenesis due to
a. altering of the microtubules in the cells. b. adhesive proteins on the surface of the cell. c. cell migration due to a chemical smell. d. physical signals from the environment. e. none of these.