More than ____________________ percent of processed foods in supermarkets contain ingredients from transgenic crops
Fill in the blank(s) with correct word
70
seventy
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The polypeptide-making organelles, which consist of protein combined with RNA, are called
A. ribosomes. B. Golgi bodies. C. lysosomes. D. centrosomes. E. mitochondria.
How would a mutation allowing a heterocyte to synthesize more chlorophyll affect the process of nitrogen fixation?
A. There will be a decrease in the amount of ammonia converted to nitrogen gas. B. There will be a decrease in the amount of nitrogen gas converted to ammonia. C. There will be an increase in the amount of ammonia converted to nitrogen gas. D. There will be an increase in the amount of nitrogen gas converted to ammonia. E. There will be no effect because photosynthesis and nitrogen fixation are not directly related.
The relatively high percentage of individuals in West Africa who are heterozygous for the sickle cell
trait is an example of _______________. A. natural selection D. heterozygote disadvantage B. genetic drift E. more than one of these C. spontaneous mutational spread
All of the following are characteristic of Corynebacterium diphtheriae EXCEPT
A. Gram-positive club-shaped rods with metachromatic granules B. Humans are the only known reservoir C. It produces a single "A-B" exotoxin that inhibits eukaryotic protein synthesis D. Avirulent stains acquire their virulence factors from virulent strain through plasmids E. Avirulent strains acquire their virulence factors from virulent strain through lysogenic phages