How old was the world thought to be when Darwin began his voyage?
a. 6 million years old
b. 6 thousand years old
c. 3.5 million years old
d. 2 billion years old
e. 4.5 billion years old
What will be an ideal response?
Answer: b
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When a gamete that is lacking a sex chromosome due to nondisjunction has fused with a gamete carrying an X chromosome, this type of abnormality leads to the _________ .
A. Triple X syndrome B. Down Syndrome C. Edward Syndrome D. the Turner syndrome E. Klinefelter Syndrome
The technique known as ________ relies on the fact that although the PCR fragments are about the same ________, they differ in ________. The DNA denaturing rate on a gel then varies with the ________ content, DNA sequence, and chemical gradient. Hence, similar fragments can be separated and identified.
What will be an ideal response?
When experimenting with Streptococcus pneumoniae in the 1920s, Griffith concluded that some substance from the dead S strain bacteria passed to the R strain bacteria, imparting virulence and the ability to form a capsule. Avery and others continued the search for the substance that "transformed" the R strain into the S strain.Hypothesis I:Genetic material or "transforming substance" is protein.Hypothesis II:Genetic material or "transforming substance" is RNA.Hypothesis III:Genetic material or "transforming substance" is DNA.An experiment was performed that demonstrated that the addition of a protein-degrading enzyme did not prevent transformation. This finding
A. supports Hypothesis I. B. supports Hypothesis II. C. supports Hypothesis III. D. rejects Hypothesis I only. E. rejects Hypothesis II only. F. rejects Hypothesis III only. G. does not support any of these hypotheses.
Which of the following processes within viral replication is the greatest source of genetic variation in RNA virus populations?
A) High mutation rate due to lack of proofreading of RNA genome replication errors. B) Transcription from the host cell RNA polymerase introduces numerous mutations. C) Capsid proteins from the host cell can replace the viral capsid. D) Viral RNA is translated by host cell ribosomes.