Specialized proteins called enzymes accelerate chemical reactions in living systems by ………………. the activation energy.

AVCN

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English
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University
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Easy
Na Nguyễn Thị Cẩm
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42 questions
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1.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
increasing
lowering
raising
generating
2.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
The Latin prefix "sesqui-" means: *
one
one half
double
one and a half
3.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
An ……………….. substance is a substance which consists of atoms of only one kind.
elementary
compound
molecule
impure
4.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
The products of reversible reactions can readily revert back to form the …………… reactants.
new
joined
original
combined
5.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
The bond between Na+ and Cl in the salt molecule is called …………... bond.
covalent
ionic
disulfide
hydrogen
6.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
In a synthesis reaction, atoms, ions, or molecules are ………. to form a large molecule.
broken down
combined
release
generated
7.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Chemical elements are designated by letter abbreviations called chemical ………... .
symbols
atoms
signs
molecules
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