What personal characteristics and events in Gregor Mendel's life significantly contributed to his ultimate contribution to the study of inheritance?
A. His training in physics and mathematics at the University of Vienna.
B. He failed his physics exam.
C. He failed his natural history exam.
D. He got his teaching license at the age of 21.
E. He got a job as a substitute teacher and enjoyed it.
A. His training in physics and mathematics at the University of Vienna.
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You isolate the DNA from a previously unknown virus and determine the melting point of the nucleic acid in the virus. What pattern, trace A, B, C, or D,would you expect if the virus DNA is single stranded?
A. trace A B. trace B C. trace C D. None of these traces represents the pattern forsingle-stranded DNA.
What is the photopigment in rod cells called?
A. photopsin B. rhodopsin C. opsin D. carotene E. melanin
The organisms that cause ringworm, or tinea, use keratin protein as their growth substrate. This is why these infections
A. have a high mortality rate. B. cause a discoloration of the skin by damaging skin pigment protein. C. produce a rash all over the body during an infection. D. are restricted to superficial skin layers.
Lungs absorb oxygen from inhaled air, and the small intestine move ingested material through the
digestive tract and absorbs nutrients from ingested food. Which of the following statements describes the type of epithelium you would expect to line each of these surfaces? a. They are both lined by a simple squamous epithelium. b. They are both lined by a simple cuboidal epithelium. c. The lungs are lined by a simple squamous epithelium, and the small intestine is lined by a ciliated columnar epithelium. d. The lungs are lined by a columnar epithelium, and the small intestine is lined by a simple squamous epithelium. e. The lungs are lined by a simple squamous epithelium, and the small intestine is lined by a simple cuboidal epithelium.