How many covalent bonds do noble gases form in nature?
a. Noble gases may form as many as three covalent bonds.
b. Noble gases may form up to eight covalent bonds.
c. Noble gases do not form covalent bonds with other atoms.
d. Noble gases only form single bonds with other noble gases.
c. Noble gases do not form covalent bonds with other atoms.
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What type of vector is typically used in gene therapy?
a. a virus b. a bacterium c. a plasmid d. both a virus and a bacterium
Which of the following chromosome combinations will produce male birds?
a. XY b. YY c. ZZ d. ZW
One disadvantage of hydroelectric energy as a renewable power source is that ____
a. it causes disease-causing organisms to remain in the stream b. it contributes to acid rain c. it produces greenhouse gases d. its dams block salmon from returning to streams to breed e. it pollutes streams downriver from the dams
"Before you just dump that enzyme-active presoak into the washing machine, be sure to ____________ so it will do a better job."
A. rub it into the stained area to increase enzyme-substrate contact B. turn up the water temperature to boiling to get the enzyme molecules moving faster C. add chlorine bleach to the enzyme D. dilute the enzyme with water