Demonstrates Helicobacter pylori:
a) Gram
b) Giemsa
c) both
d) neither
Answer: b) Giemsa
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Why did most scientists assume that the bases of DNA should be on the outside of the helix?
a. the bases were easily digested by DNA cutting enzymes b. the hydrogen bonding between sugar and phosphate would form a helix as well c. the bases needed to be accessible for replication d. a single-stranded DNA molecule would not be able to support the bases on the interior e. the bases were hydrophobic
Mutations in genes that affect __________ may
cause morphological shifts in a lineage. Fill in the blank(s) with the appropriate word(s).
An ionic bond forms when
A. an electrical attraction occurs between two atoms of different charge. B. a nonpolar attraction is formed between two atoms. C. a valence electron is shared between two atoms. D. two atoms have similar attraction for electrons.
In the citric acid cycle, succinate is oxidized to form
A. citrate. B. malate. C. oxaloacetate. D. fumarate. E. succinate.