Why is a reducing atmosphere conducive to the origin of life?
A. It is more favorable for the development of organic molecules.
B. It is rich in free oxygen.
C. It is very similar to today's atmosphere.
D. It is devoid of organic molecules.
Answer: A
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Mitochondria are usually inherited from
1.both parents. 2.the male parent. 3.the female parent. 4.neither parent. 5.None of the options is correct.
The first indication that HIV has entered the bloodstream is (are)
a. a rash on the arms and legs. b. a drop in the white blood cell count. c. flulike symptoms. d. Kaposi's sarcoma. e. the development of Kaposi's sarcoma.
Which of the following is an example of indirect active transport?
A) Na+/K+ ATPase B) aquaporin water transport C) CFTR Cl? transport D) Na+/glucose symport E) glucose permease transport
It has been observed that organisms on islands are different from, but closely related to, similar forms found on the nearest continent. This is taken as evidence that ____
A) island forms are descended from mainland forms B) common environments are inhabited by the same organisms C) island forms and mainland forms have identical gene pools D) the island forms and mainland forms are converging