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Ch 1-2 Review
Test Description: 8 Characteristics of life, scientific method, chemistry of life.
Instructions: Answer all questions to get your test result.
1) In a controlled experiment, how many variables are changed at a time?
A
as many as possible
B
one
C
none
D
at least two
2) The positively charged subatomic particles in atoms are
A
electrons
B
ions
C
protons
D
neutrons
3) A bond formed by the transfer of electrons is
A
solution
B
ionic bond
C
covalent bond
D
compond
4) Which is an example of a carbohydrate?
A
DNA or RNA
B
sugars or starches
C
lipid
D
a fat or an oil
5) The group of macromolecules that stores and transmits genetic information is
A
nucleic acids
B
proteins
C
lipids
D
carbohydrates
6) Which of the following is NOT true about water?
A
hydrogen bonds form between water molecules
B
oxygen has a partial negative charge
C
hydrogen attracts the shared electrons more than oxygen
D
it is polar
7) A higher pH means
A
a more acidic solution
B
a higher concentration of OH- ions
C
a higher concentration of H+ ions
D
more easily dissolved in water
8) Compounds that are organic
A
are always attracted to water
B
always contain oxygen
C
are not present in living things
D
always contain carbon
9) Proteins are polymers made of
A
nucleotides
B
monosaccharides
C
lipids
D
amino acids
10) Which is a well-tested explanation that unites and explains lots of different scientists' observations and hypotheses?
A
theory
B
inference
C
variable
D
hypothesis
*select an answer for all questions
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