UNL LIFE 120 Final questions &
answers rated A+ updated
which of the following contains hydrolytic enzymes?
a. vacuole
b. lysosome
c. mitochondrion
d. peroxisome
e. Golgi apparatus - correct answer ✔✔ b. lysosome
mammalian blood contains the equivalent of 0.15 M NaCl. seawater contains the equivalent of
0.45 M NaCl. what will happen if red blood cells are transferred to seawater?
a. NaCl will passively diffuse into the red blood cells
b. the blood cells will expend ATP for active transport of NaCl into the cytoplasm
c. water will leave the cells, causing them to shrivel and collapse
d. NaCl will be exported from the red blood cells by facilitated diffusion
e. the blood cells will take up water, swell, and eventually burst - correct answer ✔✔ c. water
will leave the cells, causing them to shrivel and collapse
humans can digest starch but not cellulose because
a. the monomer of starch is glucose, whereas the monomer of cellulose is galactose
b. humans harbor starch-digesting bacteria in the digestive tract
c. the monomer of starch is glucose, whereas the monomer of cellulose is glucose with a
nitrogen-containing group
d. humans have enzymes that can hydrolyze the a glycosidic linkages of starch but not the B
glycosidic linkages of cellulose
,e. humans have enzymes that can hydrolyze the B glycosidic linkages of starch but not the a
glycosidic linkages of cellulose - correct answer ✔✔ d. humans have enzymes that can hydrolyze
the a glycosidic linkages of starch but not the B glycosidic linkages of cellulose
organisms interact with their environments, exchanging matter and energy. for example, plant
chloroplasts convert the energy of sunlight to
a. carbon dioxide and water
b. oxygen
c. the energy of motion
d. chemical energy
e. kinetic energy - correct answer ✔✔ d. chemical energy
which of the following is not a polymer?
a. chitin
b. DNA
c. cellulose
d. starch
e. glucose - correct answer ✔✔ e. glucose
which of the following is present in a prokaryotic cell?
a. chloroplast
b. ribosome
c. ER
d. mitochondrion
e. nuclear envelope - correct answer ✔✔ b. ribosome
the movement of potassium into an animal cell requires
,a. low cellular concentrations of sodium
b. high cellular concentrations of potassium
c. a potassium channel protein
d. an energy source such as ATP
e. a co-transport protein - correct answer ✔✔ d. an energy source such as ATP
the main source of energy for producers in an ecosystem is
a. thermal energy
b. ATP
c. light energy
d. kinetic energy
e. chemical energy - correct answer ✔✔ c. light energy
from its atomic number of 15, it is possible to predict that the phosphorus atom has
a. 15 neutrons
b. 8 electrons in the outermost electron shell
c. 15 electrons
d. 15 protons
e. 15 protons and 15 electrons - correct answer ✔✔ e. 15 protons and 15 electrons
celery stalks that are immersed in fresh water for several hours become stiff and hard. similar
stalks left in a 0.15 M salt solution become limp and soft. from this we can deduce that the cells
of the celery stalks are
a. isotonic with fresh water but hypotonic to the salt solution
b. hypotonic to both rest water and the salt solution
c. hypertonic to both fresh water and the salt solution
d. hypotonic to fresh water but hypertonic to the salt solution
, e. hypertonic to fresh water but hypotonic to the salt solution - correct answer ✔✔ e.
hypertonic to fresh water but hypotonic to the salt solution
based on the figure above, which of these experimental treatments would increase the rate of
sucrose transport into the cell?
a. decreasing cytoplasmic pH
b. decreasing extracellular sucrose concentration
c. adding a substance that makes the membrane more permeable to hydrogen ions
d. decreasing extracellular pH
e. adding an inhibitor that blocks the regeneration of ATP - correct answer ✔✔ d. decreasing
extracellular pH
all of the following are part of a prokaryotic cell except
a. ribosomes
b. a plasma membrane
c. DNA
d. a cell wall
e. an endoplasmic reticulum - correct answer ✔✔ e. an endoplasmic reticulum
why is ATP an important molecule in metabolism?
a. its terminal phosphate group contains a strong covalent bond that, when hydrolyzed, releases
free energy
b. it provides energy coupling between exergonic and endergonic reactions
c. its hydrolysis provides an input of free energy for exergonic reactions
d. it is one of four building blocks for DNA synthesis
e. its terminal phosphate bond has higher energy than the other two - correct answer ✔✔ b. it
provides energy coupling between exergonic and endergonic reactions
answers rated A+ updated
which of the following contains hydrolytic enzymes?
a. vacuole
b. lysosome
c. mitochondrion
d. peroxisome
e. Golgi apparatus - correct answer ✔✔ b. lysosome
mammalian blood contains the equivalent of 0.15 M NaCl. seawater contains the equivalent of
0.45 M NaCl. what will happen if red blood cells are transferred to seawater?
a. NaCl will passively diffuse into the red blood cells
b. the blood cells will expend ATP for active transport of NaCl into the cytoplasm
c. water will leave the cells, causing them to shrivel and collapse
d. NaCl will be exported from the red blood cells by facilitated diffusion
e. the blood cells will take up water, swell, and eventually burst - correct answer ✔✔ c. water
will leave the cells, causing them to shrivel and collapse
humans can digest starch but not cellulose because
a. the monomer of starch is glucose, whereas the monomer of cellulose is galactose
b. humans harbor starch-digesting bacteria in the digestive tract
c. the monomer of starch is glucose, whereas the monomer of cellulose is glucose with a
nitrogen-containing group
d. humans have enzymes that can hydrolyze the a glycosidic linkages of starch but not the B
glycosidic linkages of cellulose
,e. humans have enzymes that can hydrolyze the B glycosidic linkages of starch but not the a
glycosidic linkages of cellulose - correct answer ✔✔ d. humans have enzymes that can hydrolyze
the a glycosidic linkages of starch but not the B glycosidic linkages of cellulose
organisms interact with their environments, exchanging matter and energy. for example, plant
chloroplasts convert the energy of sunlight to
a. carbon dioxide and water
b. oxygen
c. the energy of motion
d. chemical energy
e. kinetic energy - correct answer ✔✔ d. chemical energy
which of the following is not a polymer?
a. chitin
b. DNA
c. cellulose
d. starch
e. glucose - correct answer ✔✔ e. glucose
which of the following is present in a prokaryotic cell?
a. chloroplast
b. ribosome
c. ER
d. mitochondrion
e. nuclear envelope - correct answer ✔✔ b. ribosome
the movement of potassium into an animal cell requires
,a. low cellular concentrations of sodium
b. high cellular concentrations of potassium
c. a potassium channel protein
d. an energy source such as ATP
e. a co-transport protein - correct answer ✔✔ d. an energy source such as ATP
the main source of energy for producers in an ecosystem is
a. thermal energy
b. ATP
c. light energy
d. kinetic energy
e. chemical energy - correct answer ✔✔ c. light energy
from its atomic number of 15, it is possible to predict that the phosphorus atom has
a. 15 neutrons
b. 8 electrons in the outermost electron shell
c. 15 electrons
d. 15 protons
e. 15 protons and 15 electrons - correct answer ✔✔ e. 15 protons and 15 electrons
celery stalks that are immersed in fresh water for several hours become stiff and hard. similar
stalks left in a 0.15 M salt solution become limp and soft. from this we can deduce that the cells
of the celery stalks are
a. isotonic with fresh water but hypotonic to the salt solution
b. hypotonic to both rest water and the salt solution
c. hypertonic to both fresh water and the salt solution
d. hypotonic to fresh water but hypertonic to the salt solution
, e. hypertonic to fresh water but hypotonic to the salt solution - correct answer ✔✔ e.
hypertonic to fresh water but hypotonic to the salt solution
based on the figure above, which of these experimental treatments would increase the rate of
sucrose transport into the cell?
a. decreasing cytoplasmic pH
b. decreasing extracellular sucrose concentration
c. adding a substance that makes the membrane more permeable to hydrogen ions
d. decreasing extracellular pH
e. adding an inhibitor that blocks the regeneration of ATP - correct answer ✔✔ d. decreasing
extracellular pH
all of the following are part of a prokaryotic cell except
a. ribosomes
b. a plasma membrane
c. DNA
d. a cell wall
e. an endoplasmic reticulum - correct answer ✔✔ e. an endoplasmic reticulum
why is ATP an important molecule in metabolism?
a. its terminal phosphate group contains a strong covalent bond that, when hydrolyzed, releases
free energy
b. it provides energy coupling between exergonic and endergonic reactions
c. its hydrolysis provides an input of free energy for exergonic reactions
d. it is one of four building blocks for DNA synthesis
e. its terminal phosphate bond has higher energy than the other two - correct answer ✔✔ b. it
provides energy coupling between exergonic and endergonic reactions
