The prevention of infection caused by microorganisms is called ________.
A. disinfection
B. antisepsis
C. sterilization
D. sanitization
Answer: B
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Xylem sap and soil water differ in _________ because of ___________
A. solute composition; selective uptake by the endodermis B. solute composition; selective uptake by mycorrhizae C. solute composition; selective uptake by the epidermis D. pH; H+ exclusion by the endodermis
The majority of a shark's brain is devoted to processing signals of:
a. touch. b. olfaction. c. taste. d. electricity. e. vision.
If the frequency of expression of a recessive
trait in a population is 16 percent, the frequency of the recessive allele is what percent? a. 16 b. 25 c. 40 d. 50 e. 67
A viral protein needs to be expressed by Escherichia coli for vaccine production. Which of the following steps is NOT a necessary procedure for such production?
A) The Escherichia coli strain is modified to lack proteases. B) The viral protein is cloned under a specific promoter that can be turned on or off easily. C) The viral protein gene is cloned into an expression vector. D) The Escherichia coli strain is modified to express a specific RNA polymerase. E) The Escherichia coli strain is modified to produce an antibody against this vaccine.