Which of the following can be used to reduce microbes in air?
A. HEPA filters
B. ethylene oxide
C. ultraviolet light
D. both HEPA filters and ultraviolet light
E. both ethylene oxide and ultraviolet light
Answer: D
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Class I biological safety cabinets:
a. sterilize the air as it passes over the ma-terial in the cabinet. b. protect the environment from contamina-tion by biological agents by filtering the air as it is exhausted from the cabinet. c. are completely enclosed and have gloves that enable the worker to manipulate the material in the cabinet. d. are often called laminar flow hoods.
In the host-parasite relationship, it is advantageous for the parasite to disable and kill its host as quickly as possible.
Answer the following statement true (T) or false (F)
________ _______ is involved in breaking hydrogen bonds during DNA replication
a) DNA Polymerase b) Peptidyl transferase c) Helicase d) RNA Polymerase
How does the vegetal pole differ from the animal pole of a zygote?
A) The vegetal pole has a higher concentration of yolk. B) The blastomeres originate only in the vegetal pole. C) The posterior end of the embryo forms at the vegetal pole. D) The vegetal pole cells undergo mitosis but not cytokinesis. E) The polar bodies bud from this region.