The layer of the eye where photoreceptors are
located is the
a. lens.
b. cornea.
c. pupil.
d. iris.
e. retina.
Answer: e
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Which statement is TRUE regarding protein synthesis?
A) Ribosomal proteins catalyze peptide bond formation in the growing polypeptide chain. B) The 23S rRNA catalyzes peptide bond formation in the growing polypeptide chain. C) Transfer RNAs catalyze peptide bond formation in the growing polypeptide chain. D) Messenger RNA catalyzes peptide bond formation in the growing polypeptide chain.
Which of the following is true of the actinomycetes?
A. Some are photosynthetic. B. They closely resemble the fungi in morphology. C. They divide by budding. D. They are unique among prokaryotes in producing sexual spores.
What type of flower should you plant in your garden if you are particularly interested in attracting butterflies?
A. White day-blooming flowers with abundant pollen and a strong floral scent. B. Pendulous red flowers that are open day and night with no scent. C. Yellow flowers with abundant pollen and nectar and a strong floral scent. D. White, night-blooming flowers with a strong floral scent. E. Purple, tubular-shaped flowers with a light floral scent.
Imagine that you have two people using breathing gear under water. Diver 1 is using an old style "rebreather" that removes carbon dioxide before the mixture is "rebreathed" and therefore decreases overall carbon dioxide concentrations in the blood. Diver 2 is using regular SCUBA gear and is breathing air with the normal amount of carbon dioxide that does not lower blood levels of carbon dioxide. Which diver would have a higher blood pH and which would feel more an "urge to breathe"?
A. There would be no difference in blood pH or breathing between the two divers. B. Diver 1 would have higher blood pH and would feel the "urge to breathe" sooner. C. Diver 1 would have higher blood pH, while Diver 2 would feel the "urge to breathe" sooner. D. Diver 2 would have higher blood pH, while Diver 1 would feel the "urge to breathe" sooner. E. Diver 2 would have higher blood pH and feel the "urge to breathe" sooner.