The first amino acid of a new polypeptide chain is:
A) phenylalanine.
B) cysteine.
C) variable.
D) serine.
E) methionine.
Answer: E
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Which process produces a gaseous product that can be used as fuel to provide heat or power for a wastewater treatment plant?
A) trickling filter secondary wastewater treatment B) aerobic secondary wastewater treatment C) anaerobic secondary wastewater treatment D) primary wastewater treatment
Which one of the following incorrectly pairs a vertebrate group with its major evolutionary innovation?
A. Amphibians—paired lateral fins B. Dinosaurs—bipedalism C. Placoderms—jaws D. Sharks—teeth E. Ostracoderms—cartilaginous endoskeleton
The most abundant gas in the earth’s atmosphere is
a. oxygen. b. water vapor. c. argon. d. nitrogen. e. carbon dioxide.
Which of the following statements about fungi is true?
a. All are prokaryotic. b. All are multicellular. c. All require organic material for growth. d. All grow using sunlight and carbon dioxide. e. All are plants.