The neurotransmitter acetylcholine ____
a. speeds heart rate
b. induces skeletal muscle contraction
c. increases anxiety
d. has a role in memory and learning
e. dilates pupils
ANSWER: b
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In early forensic applications of DNA fingerprinting, DNA was extracted from crime scene material, digested with restriction enzymes, and then used to prepare a Southern blot. Today, polymerase chain reaction (PCR) is used in the early steps of forensic
DNA analysis. Which of the following is an advantage that PCR provides over the former method? A) PCR produces many more bands for fingerprint analysis, making it a more informative technique. B) PCR can cut DNA at many more sites than can restriction enzymes. C) PCR requires much less DNA for analysis. D) PCR can analyze DNA, proteins, and carbohydrates, whereas restriction enzyme analysis is limited to DNA.
Which of the following individuals introduced the terms “aerobes” and “anaerobes”?
A) Anton van Leeuwenhoek B) Louis Pasteur C) Robert Koch D) Rudolf Virchow
Stem cells ____
a. have the property of self-renewal by division b. are the least likely to give rise to cancer c. do not have the ability to divide d. are immature cells that become nerve tissue susceptible to cancer e. are found only in cancerous tumors
Which phrase best describes "honeydew"?
a. phloem sap leaving the anus of an aphid b. phloem sap harvested as syrup c. xylem sap separated from syrup d. xylem sap forced out of the margins of leaves