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.
B) The deletion prevents expression of a small RNA that regulates translation of all five genes.
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Which of the following statements is false?
A. Suspension filter feeding animals are all herbivores. B. The largest baleen whales are suspension filter feeders. C. Suspension filter feeding animals are found in both marine and freshwater environments. D. The similar feeding strategies of scallops and whales are an example of convergent evolution. E. None of these statements is false.
You have recently identified a molecule you believe to be a signal molecule associated with signal
transduction. All you know about this signal molecule is that chemically it is hydrophilic. As a result you expect it to interact with ____.
a. a receptor on the cell surface b. a receptor within the cytoplasm of the cell c. a receptor in the nucleus of the cell d. a receptor on the cytoplasmic surface of the plasma membrane e. a receptor associated with the endoplasmic reticulum
Animals that have a fluid-filled cavity that separates the gut from the muscles of the body wall and
have that cavity completely lined by the peritoneum are said to be
a. pseudocoelomate. b. mesenteries. c. acoelomate. d. indeterminate. e. coelomate.
14Cis a radioactive isotope, and it turns into ____________________ when it decays
Fill in the blank(s) with the appropriate word(s).