The first step in the scientific method is to make observations about a natural phenomenon.
a. true
b. false
a. true
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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
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
The nitrogenous base found in RNA but not in DNA is
a. adenine. b. cytosine. c. guanine. d. uracil. e. thymine.
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.