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

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

When e-cadherin expression ___ this increases invasiveness of tumor cells.

a. increased b. decreased c. stays the same d. none of the above

Biology & Microbiology

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%

Biology & Microbiology