When is preimplantation diagnosis performed?
a. before in vitro fertilization takes place
b. when the embryo has at least 100 cells
c. when the embryo is at the 8 cell stage
d. when the embryo becomes a fetus at 8
weeks
e. shortly after birth
C
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Sensory adaptation
a. increases one's sensitivity to changes in environmental stimuli. b. increases one's sensitivity to constant stimuli. c. is primarily associated with pain receptors. d. functions the same way in all types of sensory receptors. e. is unique to predator animals.
Which of the following is the major sign or symptom of mumps?
A) diarrhea B) nausea and vomiting C) deafness D) parotitis E) difficulty in breathing
Lederberg and Tatum's experiments demonstrated that
A. the genetic transfer occurred when the bio+, met+ phe-thr- strain transferred DNA to the bio-met- strain. B. bacteria must be in physical contact in order for bacteria to exchange genetic material. C. bacteria do not release DNA into the environment for other bacteria to take up. D. bacteria can acquire genetic material from each other. E. All of these observations were made by Lederberg and Tatum.
Microbes that dominate environments where organic matter is sparse are called what?
a. oligotrophs b. chemolithotrophs c. autotrophs d. hypoorganotrophs