Which of the following is responsible for the waterproofing of skin?
A. hyaline cartilage
B. wax
C. keratin
D. mucus
E. sweat
Answer: C
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Approximately what percentage of new drugs produced via pharmaceutical research is derived from natural compounds?
a. 75% b. 50% c. 35% d. 10%
Answer the following statements true (T) or false (F)
1. DNA polymerase is a protein used in many biotechnology methods that cuts DNA sequences into fragments that can then be pasted into vectors. 2. The method of the polymerase chain reaction (PCR) is used to make enough exact copies of DNA for researchers to use in analysis. 3. Preimplantation genetic diagnosis uses DNA testing to examine the genes in sperm, egg, or embryo cells. 4. The desired outcome of human gene therapy is to find substitute genes from other organisms to cure a disease condition. 5. If farmers use glyphosate-resistant crops, they can spray their fields with a herbicides and it will not harm the plant.
What is the protein coat of a virus called?
a. envelope b. capsule c. capsid d. phage e. pilus
What do H2O, NaCl, CO2, and HCl all have in common?
A. All are inorganic. B. All are solutes. C. All are salts. D. All are gases. E. All are acids.