By definition, if the DNA of a cell undergoes a spontaneous mutation, is was NOT due to
A. exposure to radiation.
B. insertion of transposons.
C. errors in DNA replication.
D. spontaneous depurination of nucleotides.
Answer: A
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The wobble hypothesis states that:a
more than one ribosome can bind to an mRNA molecule. b. some amino acids are coded for by more than one codon. c. there is more than one stop codon in the genetic code. d. a particular amino acid may be linked to more than one type of tRNA molecule. e. certain tRNA anticodons can pair with more than one codon sequence.
The FtsZ protein is present in prokaryotes and in chloroplasts. The protein is structurally and functionally similar to tubulin proteins of eukaryotic cells. Which of the following is a likely conclusion to draw from this information?
(A) FtsZ and tubulin proteins were both present in a common ancestor. (B) Microtubules are involved in the mechanics of photosynthesis. (C) Tubulin genes are evolutionarily derived from the gene that codes for the FtsZ protein. (D) The sequences of the genes encoding the FtsZ and tubulin proteins are identical.
Three (3) eggs are boiled and all weigh 2g. The eggs are placed in a 15% solution of NaCl and reweighed after 30 minutes.
When compared to the solution, the egg that gained weight was ________.
A. hypotonic B. isotonic C. hypertonic
During transcription, at the point where the DNA strand being copied has an adenine, _______________ is added to the mRNA.
a thymine a uracil a guanine a cytosine an adenine