In any DNA molecule, the number of thymine bases will:

A) always be equal to the number of cytosine bases.
B) always be equal to the number of adenine bases.
C) always be equal to the number of uracil bases.
D) sometimes be equal to the number of cytosine bases and sometimes equal to the number of adenine bases.
E) sometimes be equal to the number of guanine bases and sometimes equal to the number of cytosine bases.


D) sometimes be equal to the number of cytosine bases and sometimes equal to the number of adenine bases.

Biology & Microbiology

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David has just been told by his doctor that he has a malignant growth. Which of the following

is true?

a. He has a noncancerous tumor. b. The tumor cells are spreading through his body. c. He has a single mutation in one of his oncogenes. d. both (b) and (c)

Biology & Microbiology

Given the diagram below, assume that a G1 chromosome (left) underwent one round of replication in 3H-thymidine and the metaphase chromosome (right) had both chromatids labeled

Which of the following replicative models (conservative, dispersive, semiconservative) could be eliminated by this observation?

Biology & Microbiology

Extreme thermophiles belong in what group?

A. domain Archaea B. domain Bacteria C. kingdom Fungi D. domain Eukarya

Biology & Microbiology

In alternation of generations in all plants, the multicellular haploid (1n) organism is referred to as the:

A) sporophyte. B) gamete. C) gametophyte. D) zygote.

Biology & Microbiology