Some viruses can be crystallized and their structures analyzed. One such virus is yellow mottle virus, which infects beans. This virus has a single-stranded RNA genome containing about 6300 nucleotides. Its capsid is 25-30 nm in diameter and contains 180
If the yellow mottle virus begins its infection of a cell by using its genome as mRNA, which of the following would you expect to be able to measure?
A) replication rate
B) transcription rate
C) translation rate
D) accumulation of new ribosomes
E) formation of new transcription factors
Answer: C
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Compared with the interstitial fluid that bathes active muscle cells, blood reaching these muscle cells in arteries has a _____
A) higher B) higher C) greater bicarbonate concentration D) lower pH E) lower osmotic pressure
The hydrocarbons found in the membranes of archaea are identical to those found in bacteria.
Answer the following statement true (T) or false (F)
After transcription and before translation, eukaryotic mRNA is modified by adding
A) tRNAs and amino acids. B) amino acids and a poly-A tail. C) a cap of modified nucleotides and a poly-A tail. D) an AUG at one end and a poly-U tail at the other.
All of the following would have been energy sources on primitive Earth EXCEPT
A. ultraviolet light. B. heat. C. oxidation of organic molecules. D. sunlight.