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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
none
B
one
C
as many as possible
D
at least two
2) The positively charged subatomic particles in atoms are
A
protons
B
ions
C
electrons
D
neutrons
3) A bond formed by the transfer of electrons is
A
solution
B
compond
C
ionic bond
D
covalent bond
4) Which is an example of a carbohydrate?
A
a fat or an oil
B
lipid
C
sugars or starches
D
DNA or RNA
5) The group of macromolecules that stores and transmits genetic information is
A
proteins
B
lipids
C
carbohydrates
D
nucleic acids
6) Which of the following is NOT true about water?
A
it is polar
B
hydrogen bonds form between water molecules
C
oxygen has a partial negative charge
D
hydrogen attracts the shared electrons more than oxygen
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
always contain oxygen
B
always contain carbon
C
are not present in living things
D
are always attracted to water
9) Proteins are polymers made of
A
monosaccharides
B
amino acids
C
nucleotides
D
lipids
10) Which is a well-tested explanation that unites and explains lots of different scientists' observations and hypotheses?
A
variable
B
hypothesis
C
inference
D
theory
*select an answer for all questions
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