The post Darwinian view of the world includes which of the following idea(s)?
A. species are related by descent.
B. the age of the Earth is billions of years old.
C. an interaction of random variation and environmental conditions produce environmental adaptation.
D. All of the choices are correct.
E. Only two of the answers are correct.
Answer: D
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A catalase test was performed from a sheep blood agar plate on a colony of streptococci, and bubbling was observed. Which of the following statements explains this discrepancy?
a. Catalase is the inappropriate test to use on colonies of streptococci; therefore the re-sults are invalid. b. The colony may have been contaminated with sheep red blood cells, causing a false-positive result. c. The colony was most likely enterococci, not streptococci. d. No discrepancy is present. Streptococcus is a catalase-positive colony.
It has been difficult to generate drugs to treat AIDS for which reason?
A. HIV does not cause AIDS. B. HIV does not use any enzymes that can be targeted by drugs. C. HIV mutates rapidly. D. The only way to kill a virus is with a vaccine, not with drugs. E. People with HIV infections die rapidly, before the drugs have a chance to cure them.
Cells that release chemical mediators in both inflammation and allergy are the ____ cells
a. mast b. neutrophils c. eosinophils d. dendritic e. lymphocytes
Scientists in Scotland figured out a novel method to clone cells successfully. It involved
A. using an egg that was in cytokinesis and a nucleus that was in S stage of the cell cycle. B. using an egg that was in the S stage of the cell cycle and a nucleus that had just entered prophase. C. using an egg that was in the S stage of the cell cycle and a nucleus that just passed through telophase. D. using an egg and a nucleus that were at the same stage of the cell cycle.