Which of the following is TRUE regarding plasmids?
A. Plasmids are small, usually a few thousand to ten thousand base pairs.
B. Plasmids are linear.
C. Plasmids are contained within the bacterial chromosome.
D. Plasmids are rarely found in prokaryotes.
E. Plasmids dominate in eukaryotes.
A. Plasmids are small, usually a few thousand to ten thousand base pairs.
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In gene regulation and control, repression is defined as the:
a. internal change in the original nucleotide sequence of a gene or genes within an or-ganism's genome. b. mechanism of genetic control in which genes are induced only when the substrate to be degraded by enzymatic action is present. c. change of the bacterial genotypes through the exchange of DNA from one cell to another. d. mechanism of genetic control in which genes are not transcribed and therefore are not expressed in the presence of those target products in sufficient supply.
Four of the following are true about water molds. Which one is the exception?
a. Water mold is responsible for the Irish potato famine. b. Some species are aquatic parasites. c. Most act as decomposers. d. Their filaments are composed of haploid cells. e. They are heterotrophs.
The energy difference between the reactant glucose and oxygen molecules and the product water and carbon dioxide is 686 kilocalories, yet the 36 ATP molecules produced are only storing 263 kilocalories in their outermost phosphate bond. The rest of the energy went
What will be an ideal response?
As a by-product of photosynthesis, what percentage of the Earth's atmosphere is oxygen?
A) 31 percent B) 21 percent C) 10 percent D) 41 percent E) 50 percent