Nitrogenous wastes are primarily produced by
A. breakdown of amino acids.
B. breakdown of carbohydrates.
C. production of proteins.
D. breakdown of fats.
E. production of nucleic acids.
Answer: A
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A. Triglycerides B. Nucleotides C. Polypeptides D. Polysaccharides
Skin color is coded for by several different genes which results in a range of skin colors from very dark to very light. This is an example of
a. polygenic inheritance b. multifactorial trait. c. pleiotropy. d. incomplete dominance
Some organisms obtain their energy from preexisting chemical compounds and get their carbon from the atmosphere. Which of the following terms describes these organisms?
a. photoheterotrophs b. chemoautotrophs c. photoautotrophs d. chemoheterotrophs
Enzymes that cleave DNA at specific sites are called ________. Cutting by some of these enzymes results in single-stranded, complementary tails called ________.
A. endonucleases; sticky B. peptidases; lagging C. vectors; blunt D. DNases; leading