Photosynthetic organisms are ________
A) producers that make all of their organic matter from organic molecules that they take in
B) consumers that obtain organic molecules from other living organisms
C) producers that make all their own organic matter from inorganic molecules
D) decomposers that obtain nutrients from the soil
C
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Which of the following cofactors is very important in the synthesis of purines?
A. Acetyl-CoA B. Folic acid C. Cytidine diphosphate D. Glutathione
A gene may consist of thousands of nucleotides.
a. true b. false
The end product of a gene's expression blocks additional transcription of the gene. This is an example of:
A) positive control. B) activation energy. C) negative control. D) mutation. E) natural selection.
Atmospheric nitrite, produced from the reaction of ________ and ________, combines with water to form acid rain containing nitric acid (HNO3)
a. NO / O2 b. NO / O3 c. NO2 / NO3 d. N2 / O2