We would expect that a 15-nucleotide sequence that includes a stop codon at the end (as part of the 15-nucleotide sequence) will direct the production of a polypeptide that consists of
A) two amino acids.
B) three amino acids.
C) four amino acids.
D) five amino acids.
Answer: C
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A researcher lyses a cell that contains nucleic acid molecules and capsomeres of tobacco mosaic virus (TMV). The cell contents are left in a covered test tube overnight
The next day this mixture is sprayed on tobacco plants. We expect that the plants would _____.A) develop some but not all of the symptoms of the TMV infection B) develop symptoms typically produced by viroids C) develop the typical symptoms of TMV infection D) not show any disease symptoms E) become infected, but the sap from these plants would be unable to infect other plants
Carbohydrates ____
a. act as energy sources for cells b. include fats and oils c. are made of nucleic acids d. act as protein builders e. are also called steroids
Eight 10-year-olds in the community became sick within a 24-hour period with vomiting and diarrhea. Personnel from the health department interviewed the children and their families, attempting to determine the source of the illness. Which piece of information below is most suggestive of the common source?
A. All eight children attended the same birthday party two days prior to becoming ill. B. Five of the eight children ride the same school bus. C. In two of the eight families, siblings were just beginning to show signs of illness at the time of the interview. D. All eight children go to the same school. E. Six of the eight children are on the same soccer team which practices three times/week.
All of the following are actin-dependent nonmuscle motilities except
A) extension of the ER. B) cleavage furrow constriction in cytokinesis. C) chemotaxis. D) cyclosis or cytoplasmic streaming. E) amoeboid movement.