The primary plant organ for conducting photosynthesis is the
A. stoma.
B. chlorophyll.
C. leaf.
D. bark.
E. stem.
C. leaf.
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Answer the following statements true (T) or false (F)
1. If lithium has an atomic number of 3 then it will have 1 valence electron. 2. The electronegativity of an atom is a measure of its ability to attract electrons to its outer shell from another atom. 3. Table salt forms from sodium and chloride via hydrogen bonding. 4. Molecules are generally rigid structures and rarely change shape.
The apparatus in the figure was used by Stanley Miller and Harold Urey to study the origin of life on Earth. What compound was excluded from the apparatus so that it would form a reducing atmosphere?
A. CO2
B. O2
C. NH3
D. H2
E. H2O
The term used to describe bacteria that are intermediate in shape between spherical and rod-shaped is
A. bacilli. B. coccobacilli. C. vibrio. D. cocci.
Each DNA strand serves as a _____during DNA synthesis
a. replicate b. substitute c. template d. source of nucleotides e. primer