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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
as many as possible
C
at least two
D
one
2) The positively charged subatomic particles in atoms are
A
electrons
B
neutrons
C
protons
D
ions
3) A bond formed by the transfer of electrons is
A
solution
B
covalent bond
C
compond
D
ionic bond
4) Which is an example of a carbohydrate?
A
sugars or starches
B
a fat or an oil
C
DNA or RNA
D
lipid
5) The group of macromolecules that stores and transmits genetic information is
A
carbohydrates
B
proteins
C
lipids
D
nucleic acids
6) Which of the following is NOT true about water?
A
hydrogen attracts the shared electrons more than oxygen
B
hydrogen bonds form between water molecules
C
oxygen has a partial negative charge
D
it is polar
7) A higher pH means
A
a higher concentration of H+ ions
B
more easily dissolved in water
C
a more acidic solution
D
a higher concentration of OH- ions
8) Compounds that are organic
A
always contain carbon
B
are always attracted to water
C
are not present in living things
D
always contain oxygen
9) Proteins are polymers made of
A
monosaccharides
B
amino acids
C
lipids
D
nucleotides
10) Which is a well-tested explanation that unites and explains lots of different scientists' observations and hypotheses?
A
variable
B
theory
C
hypothesis
D
inference
*select an answer for all questions
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