A researcher suspects that the food in an ecosystem has been contaminated with radioactive phosphates over a period of months. Which of the following substances could be examined for radioactive phosphate to test the hypothesis?
A) the DNA of the organisms in the area
B) the amino acids within proteins produced by organisms living in the area
C) the starch produced by plants in the area
D) All of the above are true.
Answer: A
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Which statement about the genetic code is false?
A. There is no punctuation or spacing between codons. B. Nucleotides are always read in groups of three. C. Every codon codes for one amino acid. D. Some amino acids are specified by more than one codon. E. The genetic code is almost universal, but not quite.
What are the primary chemical mediators released from mast cells during a type I hypersensitivity reaction?
A) antibodies B) interleukin I and tumor necrosis factor C) histamine and serotonin D) cytokines
Which of the following statements about the auxin indole-3-acetic acid (IAA) is false? a. It is involved in polarity and tissue patterning in the embryo
b. IAA can exert different effects at different concentrations. c. IAA is made mainly in root tips and young roots. d. It causes cells to expand by increasing activity of proton pumps.
The opisthokonts include all of the following organisms EXCEPT
A. plants. B. fungi. C. choanoflagellates. D. animals.