Which one of the following steps of the scientific method should come only after a hypothesis has been formed?
A. question formulation
B. resource exploration
C. experimentation
D. observation
C. experimentation
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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
Researchers introduce DNA into plants by using ____
I. bacteria II. electric shocks III. chemical shocks
a. I only b. II only c. III only d. II and III e. I, II, and III
When e-cadherin expression ___ this increases invasiveness of tumor cells.
a. increased b. decreased c. stays the same d. none of the above
Assume that in a Hardy-Weinberg population, 9% of the individuals are of the homozygous recessive phenotype. What percentage are homozygous dominant?
A) 51% B) 9% C) 91% D) 49%