In the human genetic disease sickle cell anemia, a single change in the genetic sequence of the hemoglobin-beta gene results in the amino acid valine being substituted for the amino acid glutamic acid in the beta chain of the hemoglobin protein. Which
level(s) of the protein structure will be affected?
A) primary structure
B) secondary structure
C) tertiary structure
D) quaternary structure
E) primary, secondary, tertiary, and quaternary structures
Answer: E
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Does ADP contain the capacity to provide energy for the cell?
A. No. ADP does not contain any bonds that can be broken to provide energy for the cell. B. Yes. ADP has the same capacity to provide energy for the cell as ATP. C. Yes. Cleaving the bond between the ribose sugar and the two phosphate groups can provide energy for the cell. D. Yes. Cleaving the bond between the terminal phosphate and the phosphate attached to the ribose sugar can provide energy for the cell.
Two of the main ingredients in plant fertilizer are phosphorus and nitrogen. These elements are required for the synthesis of __________________, respectively, in the cells of the plants
A. DNA and proteins B. proteins and complex carbohydrates C. complex carbohydrates and DNA
A group of chemicals that at low doses reduces
fatigue and heightens awareness but at high doses elicits anxiety and irritability are a. depressants. b. stimulants. c. analgesics. d. hallucinogens. e. antipsychotics.
At which one of the following stages of the cell cycle does a chromosome develop into two sister chromatids?
A) mitotic phase B) S phase C) G1 phase D) G2 phase E) G0 phase