Scientific evidence suggests that Earth had cooled enough for_____ to accumulate by 4.3 billion years ago
a. carbon monoxide
b. carbon dioxide
c. oxygen
d. water
e. nuclei
ANSWER: d
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What is the name of the figure shown below that depicts the staining and photographing of an entire set of duplicated, condensed chromosomes from a single cell?
A) Cytosmear B) Cell smear C) Pap smear D) Karyotype E) Karyogram
Which statement is true?
a. Chromatin remodeling changes the order of genes between histones. b. Chromatin remodeling becomes permanent when inherited. c. DNA methylation and chromatin remodeling can cause cancer. d. DNA methylation and chromatin remodeling are independent processes.
Because carbon is able to form four covalent bonds, it can form a huge variety of structures, including linear, ________, and ________ molecules
Fill in the blank with correct word.
When a glucose molecule loses a hydrogen atom (not a hydrogen ion) as the result of an oxidation-reduction reaction, the molecule becomes
A) dehydrogenated. B) hydrogenated. C) oxidized. D) reduced. E) an oxidizing agent.