Which of the following is a reactant of the Calvin cycle?

a. carbon dioxide
b. glucose
c. oxygen
d. water


a. carbon dioxide

Biology & Microbiology

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Small circular, extrachromosomal DNA segments are known as _______.  

A.  vectors B.  plasmids C.  clones D.  RNA

Biology & Microbiology

A special structure on certain cyanobacteria for nitrogen fixation is called a(n):

a. ammonia cyst. b. homocyst. c. heterocyst. d. nematocyst. e. pneumatocyst.

Biology & Microbiology

Which of the following types of muscles are striated?

A. Skeletal and smooth B. Skeletal and cardiac C. Cardiac only D. Skeletal, smooth, and cardiac E. Triceps and biceps only

Biology & Microbiology

Which of the following countries has the most

extensive family-planning program? a. United States b. Brazil c. China d. Japan e. Pakistan

Biology & Microbiology