A viral shape that isn't classified as purely helical or icosahedral is referred to as:
a. Capsid
b. Simple
c. Prolate
d. Enveloped
e. Complex
Ans: e. Complex
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Why does E. coli shut down the trp operon if tryptophan is available in the environment?
a. Synthesizing an amino acid takes energy so it is a waste of energy to make something that is already available. b. Environmental tryptophan is of higher quality than what the E. coli can make itself. c. The trp operon encodes genes that export tryptophan from the cell; if there is already tryptophan in the environment, further export isn't necessary. d. It doesn't shut down the trp operon but only lowers the level of trp operon activity. e. E. coli actually turns the trp operon on when tryptophan is present; tryptophan is an energy source for the cell, and there is no reason to make enzymes to degrade something that is lacking in the environment.
What did comparing the sequence of the mitochondrial genome in trypanosomes with the sequence of mature mitochondrial RNAs demonstrate?
A) The RNA sequences are similar to the genome sequence, but have insertions and deletions of uracil residues. B) The RNA sequences align perfectly with the genomic DNA from which it is transcribed. C) All of the proteins necessary for translation are encoded in the mitochondrial genome. D) Translation is initiated in mitochondria only at AUG codons. E) Some mature RNAs do not have start and stop codons.
During DNA replication in E. coli, how does the cell prevent the DNA strands from following their natural tendency to seek maximum stability and reanneal?
What will be an ideal response?
In a DNA molecule, the letters, A,T,C and G represent
a. bases b. sugars c. starches d. proteins