Which gas is increasing the most in the atmosphere, thereby intensifying the greenhouse effect?
A. Carbon dioxide
B. Carbon monoxide
C. Ozone
D. Nitrogen
E. Oxygen
Answer: A
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The basis of microarray analysis is:
A. cleaving double-stranded DNA from a test subject with restriction enzymes to see if the subject's DNA has varying distances between cleavage sites. B. using gel electophoresis to determine the number and position of labeled bands after probe hybridization. C. hybridization of single-stranded DNA from a test subject with immobilized singlestranded oligonucleotides of known sequence. D. determining the amino acid sequence of proteins involved in viral infection in order to identify a genotype which is resistant to infection. E. All of the answer choices are part of microarray analysis.
Which of the following is not among the first line of defenses against infection?
a. resident bacterial populations d. skin b. tears, saliva, gastric fluid e. complement c. urine flow f. lysozyme
The major site of gas exchange in the lungs is the ____
a. bronchi b. bronchioles c. larynx d. alveoli e. respiratory bronchioles
There are two divisions in meiosis resulting in four daughter cells.
a. true b. false