The first step in the scientific method is to make observations about a natural phenomenon.

a. true
b. false


a. true

Biology & Microbiology

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Which of the following cannot be addressed directly using biotechnology?

a. determining DNA profiles from a crime scene b. inserting a gene into a person to replace a defective gene c. examining the moral implications of inserting pesticide genes into crop plants d. using bacteria to produce products such as insulin and human growth hormone

Biology & Microbiology

Each tier of the biomass pyramid depicts the

__________ of all the organisms in an ecosystem. a. size b. number of species c. dry weight d. total weight e. total utilization of materials

Biology & Microbiology

The nitrogenous base found in RNA but not in DNA is

a. adenine. b. cytosine. c. guanine. d. uracil. e. thymine.

Biology & Microbiology

Consider the case of X-linked inheritance of a recessive mutant allele. Among progeny from a cross of an unaffected male and a heterozygous female carrier,

A: all male offspring of would show the trait. B: all female offspring who receive the recessive mutant X would show the trait. C: all male offspring who receive the recessive mutant X chromosome would show the trait. D: all female offspring would be carriers. E: roughly half of the female offspring would show the trait.

Biology & Microbiology