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
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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
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.
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.
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