Which of the following traits is NOT characteristic of the genus Ignicoccus?
a. presence of ester-linked lipids in the cell membrane
b. absence of an S-layer
c. presence of a periplasm
d. presence of ATPase in an outer membrane
Answer: A
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The geological timescale was first developed using the fossil record, but this provided only a system of relative dating; absolute dates weren't established until the discovery of ____
Fill in the blank with the appropriate word.
With regard to translation in prokaryotes, the gene products are often encoded on polycistronic mRNAs. As a result, the quantities of each of the proteins are often graded, such that the first gene has a great deal of protein translated, whereas the last gene has very little. Which of the following features of prokaryotic translation may account for increased production of some products and
decreased production of others? A) The different messages have sequences with more or less homology to the Shine?Delgarno sequence; fewer ribosomes binding results in less product. B) Feedback regulation of ribosomes tells the cell that enough product is made, and ribosomes from such mRNAs dissociate. C) Because transcription and translation in prokaryotes are essentially coupled, there is no gradation in the amount of individual proteins made from a polycistronic message. D) There is no termination sequence at the end of each gene, so one long protein is made, resulting in equal amounts of products. E) all of the above
The process that discriminates between phenotypes with respect to their ability to produce offspring is known as
a. natural selection. b. gene flow. c. genetic drift. d. migration.
Which of the following is needed as a reactant for the first step of the citric acid cycle?
a. Malic acid b. Succinyl CoA c. Oxaloacetic acid d. Citric acid