Transgenic Bt crops have been genetically modified to _____
a. resist common herbicides
b. have increased protein content
c. produce an insecticide
d. be tolerant of salt in the soil
e. grow faster
c
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The fluid mosaic model proposed by Singer and Nicolson in 1972 explained that
A. the cell membrane was composed of lipids and proteins. B. the cell membrane was composed of a phospholipid bilayer between two layers of globular proteins. C. the cell membrane was composed of a phospholipid bilayer with globular proteins actually inserted into the bilayer. D. the cell membrane was composed of a phospholipid bilayer but the polar ends of the phospholipid molecules were reversed.
Prions are created when normal proteins in the body ____
a. combine with large ribosomal subunit and become infectious b. exchange several long sections of amino acids with other infected proteins c. refold into a different and infectious three-dimensional shape that kills cells in the brain and nervous system d. undergo mutation and create hundreds of copies of themselves e. invade the immune system, causing it to mistakenly destroy the body's healthy tissue
A virus with a capsid with twenty triangular faces is called:
a. icosahedral. b. helical. c. binal. d. filamentous. e. dodecahedral.
In garden peas, one pair of alleles controls the height
of the plant, and a second pair of alleles controls flower color. The allele for tall (D) is dominant to the allele for dwarf (d), and the allele for purple (P) is dominant to the allele for white (p). A tall plant with purple flowers crossed with a dwarf plant with white flowers produces 1/4 tall purple, 1/4 tall white, 1/4 dwarf purple, and 1/4 dwarf white. What is the genotype of the parents? What will be an ideal response?