Burning of carbon-based fuels can produce which one of the following, an odorless gas that competes with oxygen for binding to hemoglobin.
A) carbon monoxide.
B) hydrogen peroxide.
C) sulfuric acid.
D) methane.
Answer: A) carbon monoxide.
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The origin of a skeletal muscle is
(a) attached to the less mobile portion of the skeleton. (b) attached to the portion of the skeleton that moves when the muscle contracts. (c) never attached to the skeleton. (d) its belly.
Answer the following statements true (T) or false (F)
1. You could observe saltatory conduction in a crayfish. 2. The exposed, unmyelinated gaps between glia on myelinated axons are also sites of voltage-gated Na+ channels. 3. Electrical synapses transmit signals using neurotransmitters. 4. A given neurotransmitter can produce either excitatory or inhibitory effects on postsynaptic neurons depending on the specific receptor type it binds.
Genetic diversity in bacteria is created by mutation and __________.
Fill in the blank(s) with the appropriate word(s).
Which of the following forms of genetic information has direct contact with amino acids and therefore, directly impacts the specific type of protein product being produced? Select the best choice.
A. DNA, mRNA, and tRNA B. DNA and mRNA C. DNA and tRNA D. rRNA E. tRNA