In the polymerization of DNA, a phosphodiester bond is formed between a phosphate group of the nucleotide being added and which of the following atoms or molecules of the last nucleotide in the polymer?
a) the 3' OH
b) a nitrogen from the nitrogen-containing base
c) C6
d) the 5' phosphate
Ans: a) the 3' OH
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Marine microbes inhabit sediments on the ocean floor at a depth of up to at least ________.
A. one foot B. 100 feet C. 0.6 kilometers D. ten feet
A urine specimen obtained from a patient went to the microbiology lab for a bacterial culture and antibiotic sensitivity testing. The specimen sat out on the processing counter for a couple of hours before being cultured. Twenty fours hours later, the lab report goes into the computer---over 100,000 bacterial cells per milliliter of urine. Which statement is an accurate assessment of these results?
A. Urine samples have to be taken from the kidney in order to get a true bacterial count. B. Not all bacteria will grow on bacteriological media, so the total count is grossly underestimated. C. Urine is a sterile fluid as it leaves the body, so it is likely that the specimen was mishandled by the nursing staff when the sample was obtained. D. The bacterial count is not accurate since the culture sat without refrigeration.
In photosystem II of photosynthesis, the H2O molecules are split to form a proton gradient and put electrons in the electron transport chain. This step indicates H2O is initially
A. respired. B. reduced. C. energized. D. broken down. E. oxidized.
Place each of the following terms with the correct statement.
coevolution defensive coloration camouflage secondary chemical compounds Batesian mimicry 1. Organisms that possess this property are poisonous, sting, or are otherwise harmful; commonly black, yellow, and red in color. 2. Is the process by which different kinds of organisms adjust to one another by genetic change over long periods of time. 3. It is a situation in which a palatable organism resembles another kind of organism that is distasteful or toxic. 4. Adaptation that enables organisms to blend into their environment thereby avoiding predation. 5. Chemical compounds produced by plants that are not components of major metabolic pathways.