Which of the following classification methods relies on the morphology of organisms?
A. phage typing
B. physical characteristics
C. biochemical tests
D. analysis of nucleic acids
E. serological tests
Answer: B
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During normal human embryonic development, if ____, then the SRY gene switches development toward ____
a. a Y chromosome is present; maleness b. an X chromosome is present; femaleness c. two X chromosomes are present; femaleness d. the X chromosome is absent; maleness e. a Y chromosome is present; femaleness
Which functional group is polar and a key component of alcohols?
a. carbonyl group b. hydroxyl group c. phosphate group d. amino group e. carboxyl group
The fact that approximately 80% of the six codons that encode the amino acid leucine in yeast are UUG is an example of codon bias
Indicate whether the statement is true or false
If there are 1,000 metric tons of producers in an ecosystem, about how much of the energy in those producers will be available to secondary consumers in this ecosystem?
A) 100% B) 50% C) about 10% D) about 1% E) about 0.1%