Is the group "invertebrates" a valid monophyletic group?
A. Yes, because it includes all organisms without backbones
B. No, because most animals are vertebrates
C. Yes, because only vertebrates are deuterostomes
D. No, because the common ancestor to all the invertebrates is also an ancestor of the vertebrates
Answer: D
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An allele that is dominant in one sex but recessive in the other is
A) X-linked. B) sex-limited. C) sex-influenced. D) Y-linked.
If you start with 3 double-stranded DNA fragments, after 4 cycles of PCR you will have ________ fragments.
A. 48 B. 24 C. 27 D. 12 E. 81
You have identified a 50 nucleotide deletion that is not within an open reading frame in an otherwise wild-type prokaryotic genome. You identify five mRNAs that are not translated in these mutant bacteria; the five mRNAs are transcribed from five different genes located far from the deletion. Select the most likely explanation for the effect of this deletion.
A) The deletion is within an antisense RNA that regulates translation of all five genes. B) The deletion prevents expression of a small RNA that regulates translation of all five genes. C) The deletion removes an aptamer in an RNA leader sequence. D) The deletion removes an effector molecule that regulates transcription.
When DNA sequences are compared, the closet living relative of humans is found to be the gorilla
__________________ Indicate whether the statement is true or false.