In order to fit within a cell, DNA becomes more compact by
A.) breaking apart into separate genes
B.) extending to form very long, thin molecules
C.) wrapping tightly around histones
D.) being enzymatically changed into a protein
Ans: C.) wrapping tightly around histones
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The ________ is the entire set of proteins expressed by a genome.
Fill in the blank(s) with the appropriate word(s).
_______ is the ability of a pathogen to overcome the body defenses.
A. virucidence B. virulence C. transmissibility D. infectiousness
Which of the following statements about transgenic plants is CORRECT?
a) Transgenic plants require many years to be produced. b) Intermediate species are required for transgenic plants to be produced. c) Transgenic plants have been shown to have no detrimental effect on the environment. d) Transgenic plants contain genes from more than one species. e) Transgenic plants have been used successfully for insect resistance but not herbicide resistance.
Considering the age of the various segments of an annelid such as an earthworm,
a. They are born with all segments present and these merely grow in size; this allows segment count to be a major feature in their identification b. New segments are added just behind the prostomium, so the oldest segments are at the posterior end c. New segments are added just in front of the pygidium, so the oldest segments are at the anterior end d. Each segment doubles several times in life so all of the segments are half or one-fourth "new" at any one time e. Segments grow and duplicate in a haphazard fashion preventing their use in identification