The history of life on Earth spans nearly ____
a. 1 million years
b. 100 million years
c. 1 billion years
d. 4 billion years
e. 10 billion years
ANSWER: d
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Procedures such as grinding, mincing, vortexing, and preparing smears:
a. are hazardous and should be performed while wearing gloves and gown protec-tion. b. create aerosol droplets and should be per-formed only in an approved biosafety cabinet. c. should be avoided with specimens known to contain infectious agents. d. produce a spill hazard and should be per-formed over an absorptive mat.
Nitrogen has a higher electronegativity than hydrogen. As a result you would expect that ammonia (NH3 ) molecules can form ____ with each other.
A. ionic bonds B. hydrophilic bonds C. hydrogen bonds D. cohesive bonds E. covalent bonds
Individuals with three or more copies of each of their chromosomes are called ____
a. polyploids b. haploids c. aneuploids d. euploids e. diploids
An Arabidopsis plant that contains a mutant mp gene would most likely:a
lack roots. b. develop into callus. c. produce buds but not leaves. d. produce flowers but not fruits. e. lack a stem.