In the placenta, nutrients move from mother to baby by ____.

A. activated transport
B. the Rh factor
C. transport proteins
D. simple diffusion
E. HCG


Answer: C

Biology & Microbiology

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A "point mutation" refers to mutations involving

A) a base-pair substitution. B) the gain of a base pair (microinsertion). C) the deletion of a base pair (microdeletion). D) a substitution, deletion, or addition of one base-pair.

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In this diagram of a negative feedback system, what

labeled box represents an effector? a. A b. B c. C d. A and B e. None of these

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Vectors such as pUC18 and others of the pUC series contain a large number of restriction enzyme sites clustered in one region. Which term describes this advantageous arrangement of restriction sites?

A) multiple cloning site B) ?-galactosidase C) complementation D) palindrome E) consensus sequence

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Which member(s) of the Romanov family shared DNA sequences with England's Prince Philip?

A) both the tsar and the tsarina B) only the tsar C) only the tsarina D) neither the tsar nor the tsarina

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