Which of the following changes shape after it binds to a CD4 receptor of a T cell?
A) gp 41
B) gp 120
C) p17
D) p24
B
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One of the problems with genetically modified food crops is that if pollen released from the plants spreads among non-engineered plants it will reduce the natural genetic ____________________ of wild strains
Fill in the blanks with correct word
Canada lagged behind the United States through the early 1900's economically due to
A. lack of natural resources B. restrictions from its colonial ties to Britain C. lack of good ports D. small labor force
An uplifted erosional remnant of a floodplain that formed when a stream was flowing at a higher level
is called a(n) ____________________. Fill in the blank(s) with the appropriate word(s).
Which biome is dominated by grasses and shrubs and experiences cold temperatures and relatively low levels of precipitation?
A) Savanna B) Grasslands C) Desert D) Tundra