Organic chemicals always have a basic framework of the element ________ bonded to other atoms.
A. hydrogen
B. phosphorous
C. carbon
D. nitrogen
E. oxygen
Answer: C
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Which element functions BOTH as an enzyme cofactor and as a stabilizer of ribosomes and nucleic acids?
A) iron B) hydrogen C) zinc D) magnesium
Which of the following is true regarding a balanced polymorphism?
A. The frequency of alleles is not changing over time B. The homozygous condition for the alleles is not advantageous to the organism C. The population (or species) occupies a heterogeneous environment D. An example in humans is sickle-cell anemia E. All of the answers are correct
A warmed flask of water is analogous to the Miller-Urey experiment, which of the following is analogous to primordial Earth?
a. a strongly reducing atmosphere b. lightning c. a primeval sea d. water vapour
Which of the following is known for its swarming motility?
A. Proteus mirabilis B. Escherichia coli C. Klibsiella pneumonae D. Pseudomonas aeroruginosa