A substance was added to a cell culture that inactivated the tRNA in the cell. Which is the best prediction of what will occur in this cell culture?
A) Amino acids will not form proteins.
B) Ribosomes will not form.
C) DNA will not be copied.
D) Transcription will not occur.
Ans: A) Amino acids will not form proteins.
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Which pertains to DNA but not to RNA?
A. Contains adenine B. Contains uracil C. Contains nucleotides D. Contains thymine E. Contains ribose
Some plants have cultivated a symbiotic relationship with soil bacteria capable of fixing atmospheric nitrogen. Why do plants need nitrogen?
a. to build lipids important in membranes and energy storage b. to make the saccharides used to build their cellulose cell walls c. to synthesize amino acids that are used to form proteins d. nitrogen is an important energy source to plants that cannot harvest sunlight
Based on Charles Darwin's observations in the Galapagos Islands, why did tortoises in the Galapagos Islands have longer necks than tortoises in dry lowlands?
What will be an ideal response?
Axis development is determined by a MATERNAL EFFECT gene in Drosophila. A dominant Bicoid allele is required to set up the correct axis development in flies. bb (two loss of function alleles) is LETHAL in this MATERNAL EFFECT gene
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