The world human population has increased dramatically during the past few centuries due to:

a. increased immigration.
b. increased emigration.
c. decreased death rates.
d. increased birth rates.
e. decreased birth rates.


C

Biology & Microbiology

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Which of the boxes marked 1-4 correspond to plants that will be true-breeding?

A) 1 and 4 only B) 2 and 3 only C) 1, 2, 3, and 4 D) 1 only E) 1 and 2 only

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In the diagram of a root tip shown above, the item labeled "2" is the

a. quiescent center. b. zone of cell division. c. zone of elongation. d. root cap. e. zone of maturation.

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Transcription produces which of the following?

a. mRNA b. rRNA c. tRNA d. mRNA and tRNA e. mRNA and rRNA f. mRNA, tRNA, and rRNA are all produced by transcription.

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The basic structure of a virus includes the:

A. Inner nucleus and outer capsid B. Outer capsid and outer cell membrane C. Inner core and outer cell membrane D. Outer capsid and inner core

Biology & Microbiology