When plants undergo allopatric speciation, an initial reproductive barrier is often

A) polyploidy.
B) gametic isolation.
C) temporal isolation.
D) pollinator choice.


Answer: D

Biology & Microbiology

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You are studying a trafficking protein important for secretion in helper T cells. What is the likely outcome of a defect in this protein? 

A. impaired secretion of immunoglobulins B. impaired secretion of degraded antigens C. impaired secretion of membrane attack complex D. impaired secretion of cytokines

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Which most accurately describes the expression "recombinant DNA"?

a. DNA molecule cloned from a given organism b. DNA molecule that contains genetic information from more than one organism c. DNA molecule that is moved from one tube to another in a laboratory d. DNA molecule isolated from a specific organism e. DNA molecule that has been used in a laboratory for experimental purposes

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What is the name of the model of maximum rate of population growth?

A) Logistic B) Speculative C) Factorial D) Exponential

Biology & Microbiology