Griffith's experiment demonstrated transformation because a mouse injected with live R and heat-killed S strains of Streptococcus pneumoniae resulted in death of the mouse and the isolation of live R as well as live S cells. Hypothesize as to the type of cells that Griffith would have observed if transformation had NOT occurred.
A. Griffith would have isolated both live R and heat-killed S cells from the mouse host.
B. Griffith would have isolated no cells from the mouse host.
C. Griffith would have isolated only live R cells from the mouse host.
D. Griffith would have isolated only live S cells from the mouse host.
Answer: C
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__________ results in an early embryo that has two
or three primary tissue layers. Fill in the blank(s) with the appropriate word(s).
The dorsal blood vessel is the structure labeled __________ in Figure 31-6
A. 1
B. 2
C. 3
D. 5
E. 6
In the electron transport system, hydrogen ultimately combines with
A. carbohydrates. B. phosphate. C. oxygen. D. water.
What is the structure labeled B in the accompanying figure?
A. Cytoplasm B. Nucleoid C. Plasma membrane D. Capsule E. Pilus