Distinguish between observational and experimental research
What will be an ideal response?
ANSWER: In experimental research, a scientist compares data from an experimental treatment group
to data from a control (untreated) group, to test a hypothesis. In observational research,
scientists gather descriptive information (observations) that serve as the background for
more analytical (experimental) studies.
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When a eukaryotic gene is expressed in a bacterium, the eukaryotic regulatory sequences should be maintained in order to achieve maximum expression of the gene.
Answer the following statement true (T) or false (F)
Which of the following represents
xenotransplantation?
a. cows resistant to mad cow disease b. goats that produce spider silk c. corn with Bt genes d. pigs carrying human livers e. more than one of these represents xenotransplantation
Excitatory neurotransmitters encourage the generation of new electrical impulses by which one of the following?
A) stimulating saltatory conduction B) stimulating depolarization of postsynaptic neurons C) inhibiting postsynaptic neurons from repolarizing D) inhibiting presynaptic neurons from depolarizing E) stimulating depolarization of presynaptic neurons
Autoimmune diseases occur when
a. autoantibodies are not destroyed and target self antigens. b. T cells that react with self antigens are not destroyed and react with self antigens. c. antibodies target T cells. d. both a and b occur.