Four of the five substances listed below are
potentially toxic waste products of metabolism.
Select the exception.
a. urea
b. water
c. uric acid
d. carbon dioxide
e. ammonia
Answer: b
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Answer the following statements true (T) or false (F)
1. Restriction enzymes bind to specific sequences of DNA to seal them together. 2. Most plasmids used in biotechnology contain a selectable marker such as an antibiotic-resistance (ampR) gene. 3. A DNA library is known as a genomic library when it is derived from mRNA. 4. If a large protein is run on a gel slab and subjected to electrophoresis, one would expect to find its band towards the top of the gel.
The risk for Down syndrome increases ____
a. when the mother is over thirty-five years old b. when the father is over thirty-five years old c. when the father is over fifty years old d. for dizygotic twins e. for monozygotic twins
The code is nonoverlapping, meaning that, assuming "standard translation," a given base participates in the specification of one and only one amino acid
Indicate whether the statement is true or false
Jams, jellies, preserves, honey, and other foods with high sugar content hardly ever become contaminated by bacteria, even when the food containers are left open at room temperature. This is because bacteria that encounter such an environment ____
A) undergo death as a result of water loss from the cell B) are unable to metabolize the glucose or fructose, and thus starve to death C) are obligate anaerobes D) are unable to swim through these thick and viscous materials