Pollen of one plant species will not germinate on the flower of another species. This is an example of:

A) hybrid inviability. B) temporal isolation. C) gametic isolation. D) hybrid infertility.


Answer: C

Biology & Microbiology

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rRNAs are transcribed in the:

A. cytoplasm. B. nucleus. C. nucleolus. D. mitochondria. E. endoplasmic reticulum.

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Which type of signaling is blocked by the toxin, curare?

A. juxtacrine B. paracrine C. autocrine D. endocrine

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When a national park (located at twenty inches above sea level) is initially submerged, how

much would you expect the temperature to have increased?

a. 0.8 degrees Celsius b. 1.0 degrees Celsius c. 1.5 degrees Celsius d. 2.0 degrees Celsius

Biology & Microbiology

Capsules of pathogenic enteric bacteria are virulence factors because they _____.

A) Capture iron from hemoglobin and store it in the bacteria B) Release hemolysins that destroy red blood cells C) Produce fimbriae that enable the bacteria to attach to human cells D) Protect the bacteria from phagocytosis and from antibodies

Biology & Microbiology