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

Biology & Microbiology

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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.

Biology & Microbiology

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

Biology & Microbiology

The molecule shown above is ____

a. a triglyceride b. an amino acid c. a steroid d. a polysaccharide e. a phospholipid

Biology & Microbiology

________ 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).

Biology & Microbiology