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.
Individuals with three or more copies of each of their chromosomes are called ____
a. polyploids b. haploids c. aneuploids d. euploids e. diploids
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
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.