It has been recently determined that the gene for Duchenne muscular dystrophy (DMD) is more than 2000 kb (kilobases) in length; however, the mRNA produced by this gene is only about 14 kb long. What is a likely cause of this discrepancy?
A) The introns have been spliced out during mRNA processing.
B) More amino acids are coded for by the DNA than by the mRNA.
C) The DNA represents a double-stranded structure, whereas the RNA is single-stranded.
D) When the mRNA is produced, it is highly folded and therefore less long.
E) The exons have been spliced out during mRNA processing.
A
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Eugenic laws were enacted in an attempt to
A. prevent some individuals from reproducing. B. eliminate "bad genes" from the human population. C. improve the human gene pool. D. All of these answers are true.
Consider the following two statements: 1) Animal behavior can be required for the reproductive success of plants. 2) Animal behavior can be detrimental to the reproductive success of plants. Determine which one of the options below is correct
A. Statements 1 and 2 are both true. B. Statements 1 and 2 are both false. C. Statement 1 is true; statement 2 is false. D. Statement 1 is false; statement 2 is true.
The graph above shows the temperature profile for T. aquaticus polymerase, an enzyme used by a species of bacteria that
lives in hot springs. What does the boxed region indicate?
a. The enzyme activity increases as substrates increase their kinetic energy. b. The enzyme activity decreases as substrates increase their kinetic energy.
c. The enzyme activity increases as the enzyme denatures. d. The enzyme activity decreases as the enzyme denatures. e. The enzyme activity decreases as the enzyme refolds.
Similarities between the archaea and eukarya include
A. similar tRNA. B. the same ribosomal proteins. C. that they are more closely related to each other than to the bacteria. D. similar initiation of transcription. E. All of the choices are correct similarities.