To break a polymer down into monomers you would use what type of reaction?
a. hydrolysis
b. dehydration synthesis
c. ionic bonding
d. hydrogen bonding
a. hydrolysis
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Which of the following describes most
accurately the process of DNA cloning?
a. set of laboratory procedures that consist of cutting a segment of DNA with restriction enzymes b. set of laboratory procedures that consist of isolation of a DNA fragment from a living organism and insertion of it into a plasmid c. set of laboratory procedures that uses living cells to make many identical copies of a DNA fragment d. set of laboratory procedures by which a DNA fragment is transferred from a living organism to a SNP chip e. the manipulation of DNA fragments in a laboratory using modern techniques of molecular biology
Four of the five actions listed below are responses to
cold temperatures. Select the exception. a. vasoconstriction of peripheral blood vessels b. uncontrolled muscular contraction c. thermoreceptors send messages to the hypothalamus d. enhanced secretion of sweat glands e. increased metabolic reactions
The sinoatrial node
A) is located in the left atrium. B) sends out a signal for contraction once every two minutes. C) regulates the rate of heart contraction. D) is also known as the atrioventricular node. E) receives signals from the atrioventricular node.
Water is most dense and thus heaviest at 4°C. At 0°C, ice forms and can float on liquid water. Suppose ice were most dense at 0°C. What would happen in a lake at this temperature?
A. Ice would not form because solids are always less dense than liquids. B. The ice would cover the bottom of the aquatic system and would build up in layers over time. C. The cold temperatures and the subsequent ice formation would prevent hydrogen bonds from forming between the water molecules, thus causing the existing ice crystals to become disassociated from each other. D. The ice would cover the surface of the aquatic system and would never melt.