All living organisms have evolved from a single common ancestor. The existence of which molecule lends the greatest support to this statement?
a. phospholipids
b. ribosomal RNA
c. transfer RNA
d. DNA
e. messenger RNA
Ans: b. ribosomal RNA
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Which of the following statements concerning the microbial loop is not true?
A. Microbes consume dissolved organic matter. B. Microbes constitute particulate organic matter for zooplankton consumption. C. Marine viruses contribute to the production of dissolved organic matter. D. All of the choices are correct.
Several lineages of extinct ____ were jawless fishes with bony plates and scales and three brain regions (forebrain,
midbrain, and hindbrain).
a. acanthodians b. conodonts c. osteolepiforms d. placoderms e. ostracoderms
The molecule shown above is ____
a. a triglyceride b. an amino acid c. a steroid d. a polysaccharide e. a phospholipid
________ measured the cognitive style of first-year university students and characterized them as high risk or low risk for depression. The high-risk students who exhibited a negative thinking style proved to be much more vulnerable to depression.
Fill in the blank(s) with the appropriate word(s).