Which statement best describes the relationship that exists among proteins, DNA, and cells?
a. Proteins combine to produce cells, which produce DNA
b. Proteins are made up of DNA, which determines the cells that are produced.
c. DNA is made up of proteins, which tell a cell how to function.
d. Cells contain DNA, which controls the production of proteins.
Ans: d. Cells contain DNA, which controls the production of proteins.
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When measuring the age of a fossil using Carbon dating, what ratio is considered?
Uranium-235, with a half-life of 713,000,000 years, decays to lead-207
If a rock sample is determined to have one-quarter of the uranium-235 content it had when it formed, the age of the rock sample can be estimated to be approximately ________ years old. A) 178 million B) 713 million C) 28.5 billion D) 1.4 billion
A type of connective tissue, called ________, stores fat.
A. cartilage B. blood C. plasma D. adipose tissue
The first question in this dichotomous key addresses
a. oxygen tolerance. b. bacterial morphology. c. metabolic characteristics. d. Gram stain differences.