Which of the following is a difference between a purine and a pyrimidine?

a. Purines have a single ring structure.
b. Pyrimidines cannot bind phosphate.
c. Pyrimidines are smaller in size.
d. Purines are only found in RNA.


c. Pyrimidines are smaller in size.

Biology & Microbiology

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If a set of genes is induced in the presence of the controlling substance, it is referred to as ________ control.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

In the above figure, which of the following

would have a haploid number of chromosomes? a. A b. B c. C d. D e. C and D

Biology & Microbiology

What is the gelatinous matrix inside chloroplasts that contains ribosomes, DNA, and enzymes?

A. granum B. chlorophyll C. thylakoid D. stroma E. mitochondria

Biology & Microbiology

The diameter of most animal and plant cells ranges from

A) 0.1 to 1.0 micrometers. B) 1.0 to 10 micrometers. C) 10 to 100 micrometers. D) 100 to 1,000 micrometers.

Biology & Microbiology