A boy inherits his X chromosome from
a. his father.
b. his mother.
c. either his father or his mother.
d. both his father and his mother.
B
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Consider the structure and function of DNA. Which of the following statements is true?
A. Because DNA contains carbohydrates, it provides structural support to the cells. B. The phosphodiester bonds that stabilize the association of the two strands are easily broken and reformed. C. If the sequence of one DNA strand is known, then the sequence of the other strand can be determined. D. Since DNA is made of phosphate groups that are ionized, it could easily pass through a cell membrane.
Which one of the following is not a major plant hormone?
A. Auxins.B. Brassinosteroids. C. Ethylene. D. Cytokinins. E. Ethanol.
A heart attack or myocardial infarction is due to the sudden death of heart tissue due to lack of oxygen.
a. true b. false
Which part of the loop of the nephron actively transports salts from the filtrate to interstitial tissues?