BIL 150 EXAM 1 TEST QUESTIONS || WITH A+
GRADED SOLUTIONS.
Cotton-topped tamarins are small primates with tufts of long white hair on their heads. While
studying these creatures, you notice that males with longer hair get more opportunities to
mate and father more offspring. To test the hypothesis that having longer hair is adaptive in
these males you should....
a) test whether males with shaved heads are still able to mate
b) test whether other traits in these males are also adaptive
c) determine if hair length is heritable
d) look for evidence of hair in ancestors of tamarins correct answers C) Determine if hair
length is heritable
A researcher discovered a species of moth that lays its eggs on oak trees. Eggs are laid at two
distinct times of the year: early in spring when the oak trees are flowering and in midsummer
when flowering is past. Caterpillars from eggs that hatch in spring feed on oak flowers and
look like oak flowers, but caterpillars that hatch in summer feed on oak leaves and look like
oak twigs. How does the same population of moths produce such different-looking
caterpillars on the same trees? To answer this question, the biologist caught many female
moths from the same population and collected their eggs. He put at least one egg from each
female into eight identical cups. The eggs hatched, and at least two larvae from each female
were maintained in one of the four temperature and light conditions listed below.
A) The longer day lengths of summer trigger the development of twig-like caterpillars.
B) Differences in air pressure correct answers B) Differences in air pressure, due to
differences in elevation, trigger the development of different types of caterpillars.
In every case, caterpillars that feed on oak flowers look like oak flowers. In every case,
caterpillars that were raised on oak leaves looked like twigs. These results support which of
the following hypotheses?
A) The longer day lengths of summer trigger the development of twig-like caterpillars.
B) Differences in diet trigger the development of different types of caterpillars.
C) Differences in air pressure, due to elevation, trigger the development of different types of
caterpillars.D) The differences are genetic. A female will either produce all flowerlike
caterpillars or all twig-like caterpillars. correct answers B) Differences in diet trigger the
development of different types of caterpillars.
Recall that in the experiment, caterpillars born in the spring looked like flowers, and
caterpillars born in the summer looked like twigs. What is the most likely selective advantage
for this difference in body shape?
A) Looking like their food source lets the caterpillars blend into their surroundings, reducing
predation.
B) Looking like their food sources allows the caterpillars to move through their environment
more efficiently.
C) Looking like their food source will increase the caterpillars' feeding efficiency; this would
increase their growth rate and
, survival rate.
D) Development into the adult moth form is faster for caterpillars shaped like twigs than like
flowers. correct answers A) Looking like their food source lets the caterpillars blend into
their surroundings, reducing predation.
Why is a scientific topic best discussed by people of varying points of view, from different
subdisciplines, and representing diverse
cultures?
A) People need to exchange their ideas with other disciplines and cultures because everyone
has a right to an opinion in
science.
B) Scientists can coordinate with others to conduct experiments in similar ways.
C) Robust and critical discussion between diverse groups improves scientific thinking.
D) This is a way of ensuring that everyone gets the same results. correct answers C) Robust
and critical discussion between diverse groups improves scientific thinking.
A salamander relies on hydrogen bonding to stick to various surfaces. Therefore, a
salamander would have the greatest difficulty clinging to a...
A) surface of hydrocarbons
B) surface of mostly carbon-nitrogen bonds
C) surface of mostly carbon-oxygen bonds
D) slightly damp surface correct answers A) surface of hydrocarbons
Sulfur is in the same column of the periodic table as oxygen, but has electronegativity similar
to carbon. Compared to water molecules, molecules of H2S will...
A) have greater cohesion to other molecules of H2S
B) have a greater tendency to form hydrogen bonds with each other
C) not form hydrogen bonds with each other
D) have a higher capacity to absorb heat for the same change in temperature correct answers
C) not form hydrogen bonds with each other
When an ionic compound such as sodium chloride (NaCl) is placed in water, the component
atoms of the NaCl crystal dissociate into individual sodium ions (Na+) and chloride ions
(Cl-). In contrast, the atoms of covalently bonded molecules (e.g., glucose,
sucrose, glycerol) do not generally dissociate when placed in aqueous solution. Which of the
following solutions would be expected to contain the greatest number of solute particles
(molecules or ions)?
A) 1 liter of 1.0 M glucose
B) 1 liter of 0.5 M NaCl
C) 1 liter of 1.0 M NaCl
D) 1 liter of 1.0 M NaCl and 1 liter of 1.0 M glucose will contain equal numbers of solute
particles. correct answers C) 1 liter of 1.0 M NaCl
One of the buffers that contribute to pH stability in human blood is carbonic acid (H2CO3).
Carbonic acid is a weak acid that, when placed in an aqueous solution, dissociates into a
bicarbonate ion (HCO3-) and a hydrogen ion (H+).
GRADED SOLUTIONS.
Cotton-topped tamarins are small primates with tufts of long white hair on their heads. While
studying these creatures, you notice that males with longer hair get more opportunities to
mate and father more offspring. To test the hypothesis that having longer hair is adaptive in
these males you should....
a) test whether males with shaved heads are still able to mate
b) test whether other traits in these males are also adaptive
c) determine if hair length is heritable
d) look for evidence of hair in ancestors of tamarins correct answers C) Determine if hair
length is heritable
A researcher discovered a species of moth that lays its eggs on oak trees. Eggs are laid at two
distinct times of the year: early in spring when the oak trees are flowering and in midsummer
when flowering is past. Caterpillars from eggs that hatch in spring feed on oak flowers and
look like oak flowers, but caterpillars that hatch in summer feed on oak leaves and look like
oak twigs. How does the same population of moths produce such different-looking
caterpillars on the same trees? To answer this question, the biologist caught many female
moths from the same population and collected their eggs. He put at least one egg from each
female into eight identical cups. The eggs hatched, and at least two larvae from each female
were maintained in one of the four temperature and light conditions listed below.
A) The longer day lengths of summer trigger the development of twig-like caterpillars.
B) Differences in air pressure correct answers B) Differences in air pressure, due to
differences in elevation, trigger the development of different types of caterpillars.
In every case, caterpillars that feed on oak flowers look like oak flowers. In every case,
caterpillars that were raised on oak leaves looked like twigs. These results support which of
the following hypotheses?
A) The longer day lengths of summer trigger the development of twig-like caterpillars.
B) Differences in diet trigger the development of different types of caterpillars.
C) Differences in air pressure, due to elevation, trigger the development of different types of
caterpillars.D) The differences are genetic. A female will either produce all flowerlike
caterpillars or all twig-like caterpillars. correct answers B) Differences in diet trigger the
development of different types of caterpillars.
Recall that in the experiment, caterpillars born in the spring looked like flowers, and
caterpillars born in the summer looked like twigs. What is the most likely selective advantage
for this difference in body shape?
A) Looking like their food source lets the caterpillars blend into their surroundings, reducing
predation.
B) Looking like their food sources allows the caterpillars to move through their environment
more efficiently.
C) Looking like their food source will increase the caterpillars' feeding efficiency; this would
increase their growth rate and
, survival rate.
D) Development into the adult moth form is faster for caterpillars shaped like twigs than like
flowers. correct answers A) Looking like their food source lets the caterpillars blend into
their surroundings, reducing predation.
Why is a scientific topic best discussed by people of varying points of view, from different
subdisciplines, and representing diverse
cultures?
A) People need to exchange their ideas with other disciplines and cultures because everyone
has a right to an opinion in
science.
B) Scientists can coordinate with others to conduct experiments in similar ways.
C) Robust and critical discussion between diverse groups improves scientific thinking.
D) This is a way of ensuring that everyone gets the same results. correct answers C) Robust
and critical discussion between diverse groups improves scientific thinking.
A salamander relies on hydrogen bonding to stick to various surfaces. Therefore, a
salamander would have the greatest difficulty clinging to a...
A) surface of hydrocarbons
B) surface of mostly carbon-nitrogen bonds
C) surface of mostly carbon-oxygen bonds
D) slightly damp surface correct answers A) surface of hydrocarbons
Sulfur is in the same column of the periodic table as oxygen, but has electronegativity similar
to carbon. Compared to water molecules, molecules of H2S will...
A) have greater cohesion to other molecules of H2S
B) have a greater tendency to form hydrogen bonds with each other
C) not form hydrogen bonds with each other
D) have a higher capacity to absorb heat for the same change in temperature correct answers
C) not form hydrogen bonds with each other
When an ionic compound such as sodium chloride (NaCl) is placed in water, the component
atoms of the NaCl crystal dissociate into individual sodium ions (Na+) and chloride ions
(Cl-). In contrast, the atoms of covalently bonded molecules (e.g., glucose,
sucrose, glycerol) do not generally dissociate when placed in aqueous solution. Which of the
following solutions would be expected to contain the greatest number of solute particles
(molecules or ions)?
A) 1 liter of 1.0 M glucose
B) 1 liter of 0.5 M NaCl
C) 1 liter of 1.0 M NaCl
D) 1 liter of 1.0 M NaCl and 1 liter of 1.0 M glucose will contain equal numbers of solute
particles. correct answers C) 1 liter of 1.0 M NaCl
One of the buffers that contribute to pH stability in human blood is carbonic acid (H2CO3).
Carbonic acid is a weak acid that, when placed in an aqueous solution, dissociates into a
bicarbonate ion (HCO3-) and a hydrogen ion (H+).
