Which of the following statements best describes ribozymes?
a. Ribozymes are proteins that aid in the production of ribosomes.
b. Ribozymes are nucleic acids that produce ribose sugars.
c. Ribozymes store enzymes in ribosomes.
d. Ribozymes process RNA molecules in eukaryotes.
Ans: d. Ribozymes process RNA molecules in eukaryotes.
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Worldwide declines in the population size of frogs have recently been linked to ____
a. overharvesting b. a fungus c. dams d. decreases in global temperatures e. increases in precipitation
How does the lactose repressor block transcription of the lactose operon?
a. by "turning off" the appropriate genes in the intron b. by regulating the activity of the enzymes that the operon codes for c. by binding allosterically to the appropriate genes d. by slowing the uptake of lactose into the cell e. by binding to the operator
When something appears blue, it is absorbing all colors except ________.
A. blue B. red C. yellow D. orange E. green
A powerful way to demonstrate that observed differences between a treatment group and a control group truly reflects the effect of the treatment is for researchers to:
A) get their study published in a scientific journal. B) use a variety of statistical tests until they find one that shows statistical significance. C) conduct the experiment over and over again. D) make more observations. E) formulate as many hypotheses as possible.