The basis of heredity was the direct result of critical and logical thinking. After considering alternative scientific explanations to explain the data he obtained, Gregor Mendel laid the foundation for genetics. His conclusions were based on carefully planned investigations. What organism did Mendel select to carry out his investigations?
A) snapdragon plants
B) fruit flies
C) mice
D) pea plants
Ans: D) pea plants
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Blood returning to the mammalian heart in a pulmonary vein will drain first into the
A. vena cava. B. left atrium. C. right atrium. D. left ventricle. E. right ventricle.
Which fossil would you expect to be found in
the deepest layers of the Earth?
a. dinosaur b. monkeys c. frogs d. bacteria e. all of these would be at the same level
Which of these provides evidence of the common ancestry of all life?
A) near universality of the genetic code B) structure of the nucleus C) structure of cilia D) structure of chloroplasts
Why does a DNA strand grow only in the 5? to 3? direction?
A) because DNA polymerases can only add nucleotides to the 3? end of the growing molecule B) because DNA polymerases can only add nucleotides to the 5? end of the growing molecule C) because the DNA molecule only unwinds in the 5? to 3? direction D) because DNA polymerase requires the addition of a starter nucleotide at the 5? end