Photosynthetic organisms are essential for limiting the damage done by global warming because they ____
a. move carbon from the atmosphere to living organisms
b. move carbon from the soil to the atmosphere
c. move carbon from the atmosphere to the soil
d. produce oxygen
e. sequester carbon in geologic sediments
ANSWER: a
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Changing a single amino acid in a protein consisting of 325 amino acids would _____
A) alter the primary structure of the protein but not its tertiary structure or function B) cause the tertiary structure of the protein to unfold C) always alter the biological activity or function of the protein D) always alter the secondary structure of the protein and disrupt its biological activity E) always alter the primary structure of the protein, sometimes alter the tertiary structure of the protein, and sometimes affect its biological activity
When DNA fragments are sealed together by DNA ligase, the process is referred to as ____
a. transformation b. gene remodeling c. the polymerase chain reaction d. restriction cloning e. ligation
In a defined medium, _____.
a. the exact chemical composition of the medium is known b. agar is available for microbial nutrition c. blood may be included d. organic chemicals are excluded
Blood agar plates are an example of ________ medium
A) differential B) selective C) reducing D) defined E) transport