DNA differs from RNA in that DNA

A) is single stranded.
B) contains deoxyribose.
C) is made up of nucleotides.
D) contains cytosine.
E) contains phosphates.


B

Biology & Microbiology

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Which cells are divided into two groups: T cells and B cells?

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Which embryonic tissue is incorrectly

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If something in the environment controls a population level and is uninfluenced by the population size, it is known as 

A. a biotic factor. B. a density-dependent limiting factor. C. a density-independent limiting factor. D. None of these answers is true.

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Which of the following terms is the study of an

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