★ Skeleton and Muscles Quiz
When a muscle contracts, it _______
A. gets longer
B. gets shorter
C. gets thinner
D. grows hair
Select your answer:
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Genetics: Viruses and Bacteria › ViewTransformation occurs when ________________.
A. None of these.
B. a virus injects DNA into the bacterium.
C. a plasmid is transferred from one bacteria to another.
D. bacteria take up DNA from the environment.
Heredity and Living Cells › View
Which type of microscope made it possible to see the smaller organelles of cells?
A. stereo microscope
B. electron microscope
C. compound microscope
D. light microscope