NEX PRACTICE EXAM QUESTIONS &
UPDATED ANSWERS PASSED ALREADY
GRADED A+
The medulla oblongata has peripheral chemoreceptors in the aorta and carotid body that are
more sensitive to levels of carbon dioxide and pH than oxygen. Which of the following facts
would best support this statement?
a. About 97.5% of our oxygen is carried by hemoglobin in the blood
b. About 25% of our carbon dioxide is carried by hemoglobin
c. About 70% of our carbon dioxide exists as bicarbonate ions in the blood
d. About 2.5% of our oxygen and 5% of our carbon dioxide are dissolved gases in the blood
c. About 70% of our carbon dioxide exists as bicarbonate ions in the blood
Carbon dioxide dissolves much more readily than oxygen, and a higher percentage exists as
detectable bicarbonate ions in the blood. Most of the oxygen is bound in the hemoglobin and
harder to detect.
The phase in mitosis during which the chromatids are still attached at the centromere and lined
up on the equatorial plate is
a. Prophase
b. Metaphase
c. Anaphase
d. Telophase
b. Metaphase
two or more reactants form one product (A + B → C).
Synthesis/Combination
single compound breaks down into two or more simpler substances
(AB → A + B).
Decomposition
more active element replaces less active element (A + BC → B + AC).
,Single Replacement
two species (typically ions) are replaced (AB + CD → AD + CB).
Double Replacement
a compound (typically carbon) combines with oxygen in the air.
Combustion (burning)
Algae found on the surface of a pond or ocean would be classified as
a. Primary consumers
b. Decomposers
c. Autotrophs
d. Secondary consumers
c. Autotrophs
Autotrophs like algae and green plants manufacture their own food from carbon dioxide, water,
and the sun's energy.
An efficient way to stop the production of proteins would be to block
a. Ribosomes
b. Lysosomes
c. The Golgi apparatus
d. Mitochondria
a. Ribosomes
Ribosomes produce proteins in the cytoplasm and on the endoplasmic reticulum.
The average kinetic energy of particles is the _____________ of a substance.
a. phase
b. repulsion
c. temperature
d. density
c. temperature
The kinetic theory of matter says that: constantly moving particles make up matter. The energy
of a particle depends on its state. Gas particles have the most energy (most molecular motion),
while solid particles have the least. The average kinetic energy of the particles is the
temperature of a substance.
,Which of these compounds would be acidic as a solute in water?
a. NaCl
b. NaOH
c. HCl
d. Mg(OH)2
c. HCl
HCl is hydrochloric acid, which is found in the stomach. An acid must dissociate in water to
release hydrogen ions. NaCl is a neutral salt, and the other two compounds are bases.
Cell cycle refers to
a. Prophase, metaphase, anaphase, telophase
b. Interphase, mitosis, cytokinesis
c. Meiosis I and II
d. Nuclear division
b. Interphase, mitosis, cytokinesis
The cell spends about 76% of its time in interphase, followed by mitosis and cytokinesis.
Which of the following states of matter have the greatest molecular motion?
a. gas
b. liquids
c. solids
d. phase
a. gas
The kinetic theory of matter says that: constantly moving particles make up matter; the energy
of a particle depends on its state. Gas particles have the most energy (most molecular motion),
while solid particles have the least.
HCl + NaOH > H2O + NaCl is an example of what type of reaction?
a. Synthesis
b. Combustion
c. Neutralization
d. Double replacement
, c. Neutralization
Neutralization is another name for an acid-base chemical reaction.
The openings on the underside of a green plant leave that allow oxygen and carbon dioxide to
exchanges are known as
a. Chlorophyll
b. Chloroplasts
c. Xylem
d. Stomates
d. Stomates
Stomata or stomates are the openings that allow gas exchange and transpiration of water.
An aluminum ion contains 13 protons in the nucleus. How many electrons are in an Al+3 ion?
a. 3
b. 13
c. 10
d. 16
c. 10
An aluminum atom has 13 electrons, but is 3 are removed to form an ion with a +3 charge, it
will have 10 remaining electrons
The word cutaneous is associated with the
a. Integumentary system
b. Nervous system
c. Endocrine system
d. Skeletal system
a. Integumentary system
The hypodermis is also known as the subcutaneous layer.
If you placed a human nerve cell in distilled water, the direction of osmosis will cause the cell
a. To shrink
b. To swell
c. There will be no osmosis
d. To shrink and swell the same amount
UPDATED ANSWERS PASSED ALREADY
GRADED A+
The medulla oblongata has peripheral chemoreceptors in the aorta and carotid body that are
more sensitive to levels of carbon dioxide and pH than oxygen. Which of the following facts
would best support this statement?
a. About 97.5% of our oxygen is carried by hemoglobin in the blood
b. About 25% of our carbon dioxide is carried by hemoglobin
c. About 70% of our carbon dioxide exists as bicarbonate ions in the blood
d. About 2.5% of our oxygen and 5% of our carbon dioxide are dissolved gases in the blood
c. About 70% of our carbon dioxide exists as bicarbonate ions in the blood
Carbon dioxide dissolves much more readily than oxygen, and a higher percentage exists as
detectable bicarbonate ions in the blood. Most of the oxygen is bound in the hemoglobin and
harder to detect.
The phase in mitosis during which the chromatids are still attached at the centromere and lined
up on the equatorial plate is
a. Prophase
b. Metaphase
c. Anaphase
d. Telophase
b. Metaphase
two or more reactants form one product (A + B → C).
Synthesis/Combination
single compound breaks down into two or more simpler substances
(AB → A + B).
Decomposition
more active element replaces less active element (A + BC → B + AC).
,Single Replacement
two species (typically ions) are replaced (AB + CD → AD + CB).
Double Replacement
a compound (typically carbon) combines with oxygen in the air.
Combustion (burning)
Algae found on the surface of a pond or ocean would be classified as
a. Primary consumers
b. Decomposers
c. Autotrophs
d. Secondary consumers
c. Autotrophs
Autotrophs like algae and green plants manufacture their own food from carbon dioxide, water,
and the sun's energy.
An efficient way to stop the production of proteins would be to block
a. Ribosomes
b. Lysosomes
c. The Golgi apparatus
d. Mitochondria
a. Ribosomes
Ribosomes produce proteins in the cytoplasm and on the endoplasmic reticulum.
The average kinetic energy of particles is the _____________ of a substance.
a. phase
b. repulsion
c. temperature
d. density
c. temperature
The kinetic theory of matter says that: constantly moving particles make up matter. The energy
of a particle depends on its state. Gas particles have the most energy (most molecular motion),
while solid particles have the least. The average kinetic energy of the particles is the
temperature of a substance.
,Which of these compounds would be acidic as a solute in water?
a. NaCl
b. NaOH
c. HCl
d. Mg(OH)2
c. HCl
HCl is hydrochloric acid, which is found in the stomach. An acid must dissociate in water to
release hydrogen ions. NaCl is a neutral salt, and the other two compounds are bases.
Cell cycle refers to
a. Prophase, metaphase, anaphase, telophase
b. Interphase, mitosis, cytokinesis
c. Meiosis I and II
d. Nuclear division
b. Interphase, mitosis, cytokinesis
The cell spends about 76% of its time in interphase, followed by mitosis and cytokinesis.
Which of the following states of matter have the greatest molecular motion?
a. gas
b. liquids
c. solids
d. phase
a. gas
The kinetic theory of matter says that: constantly moving particles make up matter; the energy
of a particle depends on its state. Gas particles have the most energy (most molecular motion),
while solid particles have the least.
HCl + NaOH > H2O + NaCl is an example of what type of reaction?
a. Synthesis
b. Combustion
c. Neutralization
d. Double replacement
, c. Neutralization
Neutralization is another name for an acid-base chemical reaction.
The openings on the underside of a green plant leave that allow oxygen and carbon dioxide to
exchanges are known as
a. Chlorophyll
b. Chloroplasts
c. Xylem
d. Stomates
d. Stomates
Stomata or stomates are the openings that allow gas exchange and transpiration of water.
An aluminum ion contains 13 protons in the nucleus. How many electrons are in an Al+3 ion?
a. 3
b. 13
c. 10
d. 16
c. 10
An aluminum atom has 13 electrons, but is 3 are removed to form an ion with a +3 charge, it
will have 10 remaining electrons
The word cutaneous is associated with the
a. Integumentary system
b. Nervous system
c. Endocrine system
d. Skeletal system
a. Integumentary system
The hypodermis is also known as the subcutaneous layer.
If you placed a human nerve cell in distilled water, the direction of osmosis will cause the cell
a. To shrink
b. To swell
c. There will be no osmosis
d. To shrink and swell the same amount
