Where does the C4 cycle get its name?
A) It is a four-step process.
B) The first product in the cycle has four carbons.
C) PEP is a four-carbon molecule.
D) Only four carbons are used in the cycle.
E) Four CO2 molecules are released.
B
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In the geologic timescale, the sequence of eons and eras beginning with the earliest era and proceeding forward to the most recent era is
A. Cenozoic - Archean - Mesozoic - Paleozoic - Proterozoic. B. Mesozoic - Cenozoic - Paleozoic - Proterozoic - Archean. C. Paleozoic - Proterozoic - Archean - Mesozoic - Cenozoic. D. Archean - Paleozoic - Proterozoic - Cenozoic - Mesozoic. E. Archean - Proterozoic - Paleozoic - Mesozoic - Cenozoic.
The enzyme that breaks down ethanol is
alcohol
a. dehydrogenase. b. oxidase. c. peroxidase. d. catalase. e. protease
Many factors control the activity of genes. The array of chemicals that is responsible for turning a gene "on" is known as the ________
A) epigenome B) fingerprint C) genetic engineer D) recombinant gene
When there is a well-established segment of heterochromatin on an interphase chromosome, there is usually a special barrier sequence that prevents the heterochromatin from expanding along the entire chromosome
Gene A, which is normally expressed, has been moved by DNA recombination near an area of heterochromatin. None of the daughter cells produced after this recombination event express gene A, even though its DNA sequence is unchanged. What is the best way to describe what has happened to the function of gene A in these cells? (a) barrier destruction (b) heterochromatization (c) epigenetic inheritance (d) euchromatin depletion