The nucleolus manufactures the components of ribosomes?
a. true
b. false
a. true
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During a year, plants never use 100% of the incoming solar radiation for photosynthesis. What is a reasonable explanation for this?
I) Plants cannot photosynthesize as well during winter (in cold winter climates). II) Plants cannot photosynthesize as well on cloudy days. III) The pigments that drive photosynthesis respond to only a fraction of the wavelengths that are available. A) only I B) only II C) only III D) only II and III E) I, II, and III
The disease caused by Streptococcus mutans is
A. plague. B. trachoma. C. dental decay or caries. D. atypical pneumonia.
Retroviruses are characterized by
a. an RNA core. b. integrating DNA into the host’s chromosome. c. the enzyme reverse transcriptase. d. having one strain that causes AIDS. e. all of these
Which of the following is a unique organelle found within some protists but not in higher animal cells?
A. Contractile vacuole B. Golgi apparatus C. Endoplasmic reticulum D. Mitochondrion