A controlled experiment _____________.
a) includes at least two groups, one differing from the other by
two or more variables
b) is repeated many times to ensure that the results are accurate
c) includes on group for which the scientist controls all variables
d) includes at least two groups, one of which does not receive
the experimental treatment Correct Answers d
A covalent bonds is one in which___________.
a) outer-shell electrons of two atoms are shared so as to
satisfactorily fill their respective orbitals
b) protons and neutrons are shared by two atoms so as to satisfy
the requirements of both atoms
c) outer-shell electrons of one atom are transferred to fill the
inner electron shell of another atom
d) electrons are removed from one atom and transferred to
another to another atom so that the two atoms become
oppositely charged Correct Answers a
A friend of yours calls to say that his car would not start this
morning. He asks for your help. You say that you think the
battery must be dead. If so, then jump-starting the car from a
good battery will solve the problem. In doing so, you are _____.
a) making observations to inspire a theory for why the car will
not start
b) testing a theory for why the car will not start
c) comparing multiple hypotheses for why the car will not start
d) starting a hypothesis and using that hypothesis to make a
testable prediction Correct Answers d
, All the organisms on your campus make up
A) an ecosystem.
B) a community.
C) a population.
D) a taxonomic domain. Correct Answers B
As letters are to English language, ________ is/are to genetic
information.
a) proteins
b) nucleotides
c) DNA
d) A and B Correct Answers c
Characters are transmitted from parents to offspring. _________
are the units of inheritance.
a) proteins
b) genes
c) RNA
d) DNA Correct Answers b
Cohesion, surface tension, and adhesion are the properties of
water molecules that ________.
a) increase when temperature increases
b) increase when pH increases
c) are a result of polar covalent bonding
d) are a result of hydrogen bonding Correct Answers d
In a chemical reaction, the element 13Al will most
preferably________.
a) gain three electrons and become positively charged
b) lose five electrons and become positively charged
c) gain five electrons and become negatively charged