What is the basic shape of a tRNA molecule?
A) A three-dimensional cloverleaf
B) A straight strand
C) A right-handed helix
D) A globular ball
E) A ?-pleated sheet
A
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The main bonds present in the C domain of antigen-binding proteins are
A) hydrogen bonds. B) intrachain disulfide bonds. C) ionic bonds. D) van der Waals forces.
One advantage of angiosperm seeds is the presence of seed ____, a nutritive tissue produced during fertilization that nourishes the developing embryo.
a. a coat b. endosperm c. ovule d. pollen sac e. ovary
Crops have been genetically modified to resist the herbicide ____
a. glyphosate b. DDT c. triazine d. 2, 4-D e. atrazine
Many polychaetes are euryhaline meaning that they
a. Can tolerate a wide range of salinity b. Must live in marine conditions c. Possess both male and female reproductive organs d. Always live in tubes e. Lack any circulatory system