What is a conjugated system?

a. a pigment region where hydrogen atoms are covalently bonded to each other with alternating single and double bonds
b. a pigment region where oxygen atoms are covalently bonded to each other with alternating single and double bonds
c. a pigment region where carbon atoms are covalently bonded to each other with alternating single and double bonds
d. a pigment region where nitrogen atoms are covalently bonded to each other with alternating single and double bonds


Ans: c. a pigment region where carbon atoms are covalently bonded to each other with alternating single and double bonds

Biology & Microbiology

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What types of antigens are most susceptible to the action of precipitins?

A. Antigens on bacterial surfaces B. Host cellular antigens C. Antigens on the surface of viral particles D. Soluble antigens

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Electrons transfer phosphorylation is represented by the letter ____. Fill in the blank(s) with the appropriate word(s)

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The disappearance of dinosaurs about 65 million years ago is an example of ____

a. adaptive radiation b. natural selection c. genetic drift d. mass extinction e. minor extinction

Biology & Microbiology

An unknown chemical is analyzed and found to contain the bases thymine and guanine. This chemical is most likely

A. mRNA. B. tRNA. C. DNA. D. rRNA.

Biology & Microbiology