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teas 7 science exam 2024 Questions with verified correct answers
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teas 7 science examThe following diagram summarizes the carbonic acid-bicarbonate ion buffer system
of the blood.
CO2 + H20 < > H2CO3 < > HCO3- + H+
Which of the following equations show the reaction that takes place when there are
excessive protons (H+) in the blood?
A. H2CO3 --> CO2 + H20
B. CO2 + H20 --> H2CO3
✅✅
C. HCO3- + H+ --> H2CO3
D. H2CO3 --> HCO3- + H+ - -C. HCO3- + H+ --> H2CO3
The following diagram summarizes the carbonic acid-bicarbonate ion buffer system
of the blood.
CO2 + H20 < > H2CO3 < > HCO3- + H+
Which of the following equations show the reaction that takes place when there are
very little protons (H+) in the blood?
A. H2CO3 --> CO2 + H20
B. CO2 + H20 --> H2CO3
✅✅
C. HCO3- + H+ --> H2CO3
D. H2CO3 --> HCO3- + H+ - -D. H2CO3 --> HCO3- + H+
which of the following describes the process by which solid carbon dioxide (dry ice)
turns directly into carbon dioxide gas?
A. Evaporation
B. Sublimation
✅✅
C. Deposition
D. Condensation - -B. Sublimation
which of the following describes why water has a concave, or
downward-curving, meniscus when poured in a glass beaker?
A. The adhesive forces with the glass are greater than the cohesive forces.
B. Glass has a higher density than water.
C. Water has a higher density than glass.
✅✅
D. A. The cohesive forces with the glass are greater than the adhesive forces. -
-A. The adhesive forces with the glass are greater than the cohesive forces.
concave meniscus is when molecules are attracted more to the container then
themselves = adhesive forces = downward curving
concave meniscus is when molecules are attracted more to each other then the
container = cohesive forces = upward curving
,Which of the following actions does a hydrophilic hormone take to activate a target
cell?
A. The hormone binds to cell-surface receptors of the target cell.
B. The hormone passes through the plasma membrane of a target cell.
✅✅
C. The hormone binds to a cytosolic receptor in the target cell.
D. The hormone enters a target cell through a transport protein. - -A. The
hormone binds to cell-surface receptors of the target cell.
hydrophilic = water loving hormones can just bind to the receptors on the outside of
the cell which that binding can change the permeability of the cell making it more
open to activate this target cell (usually its a second messenger system). This is
action is when the endocrine system sends hormones to target cells.
Which of the following best describes adaptive immunity?
A. The initiation of internal defenses, such as phagocytes and natural killer cells.
B. The body's barrier defenses, such as mucous membranes and secretions.
✅✅
C. A response to specific traits of specific pathogens
D. The initation of the inflammatory response. - -C. A response to specific traits
of specific pathogens
adaptive immunity = specific and targeted
immune immunity = nonspecific and general
(the other three are innate immunity)
Permanent damage to which of the following types of tissues in the spinal cord will
cause paralysis?
A. Bone tissue
B. Nervous tissue
✅✅
C. Muscle tissue
D. Connective tissue - -B. Nervous tissue
nervous system is all about messages so if you cant send messages you cant move
your muscles since they need the command from the nervous system
Which of the following describes the function of tendons?
A. Tendons attach two bones.
B. Tendons attach bones to ligaments.
✅✅
C. Tendons attach skeletal muscles to ligaments.
D. Tendons attach skeletal muscles to bones. - -D. Tendons attach skeletal
muscles to bones.
ligaments is bone to bone
Which of the following is used to indicate mass?
A. mg
B. μm
✅✅
C. cm^3
D. mL - -A. mg
,μm = length
cm^3 = volume
mL = volume
Histones are proteins associated with which of the following?
A. Sperm cells
B. Blood
✅✅
C. DNA
D. Hair follicles - -C. DNA
condenses the DNA into chromatin
The shortening of a sacromere in skeletal muscle is directly due to the interaction of
which of the following?
A. Acetylcholine and acetylcholinesterase
B. Dynein and Kinesine
✅✅
C. Pepsin and pepsinogen
D. Myosin and Actin - -D. Myosin and Actin
Which of the following bases is found in RNA but is absent from DNA?
A. Adenine
B. Uracil
✅✅
C. Cytosine
D. Thymine - -B. Uracil
Which of the following occurs during inhalation?
A. The volume of the thoracic cavity decreases.
B. Air moves from areas of low pressure to areas of high pressure.
✅✅
C. The ribcage lowers.
D. The diaphragm moves downward. - -D. The diaphragm moves downward.
at the same time the ribs move upward and when the thoracic cavity volume
increases then pressure decreases so air moves from high to low
When an ionic salt dissolves in water, the ions CO3^2- and K^+ are formed. Which of
the following is the formula for the salt?
A. K3CO2
B. KCO3
✅✅
C. K(CO3)2
D. K2CO3 - -D. K2CO3
CO3 HAS A NEGATIVE 2 CHARGE = meaning two more electrons then protons
K^+ HAS A POSTIVE 1 CHARGE = meaning it has one more proton then electrons
and is missing one electron
to make this a neutral salt you need two K ions for every one carbonate ion (CO3)
K2CO3 +H2O = K+(aq) + CO3^2-(aq)
, A mutation of a portion of a DNA molecule changed the resulting mRNA sequence
from AUU-GGG-UUC to CUU-GGG-UUC. Using the table, predict the resulting
amino acid sequence.
A. From Met-Gly-Leu to Leu-Gly-Phe
B. From Leu-Gly-Phe to Met-Gly-Leu
✅✅
C. From lle-Gly-Ser to Leu-Gly-Phe
D. From lle-Gly-Phe to Leu-Gly-Phe - -D. From lle-Gly-Phe to Leu-Gly-Phe
Which of the following statements correctly describes the change in coat coloring of
an Arctic fox from brown in summer to white in winter?
A. The fox's phenotype changes, but the genotype does not.
B. Neither the phenotype nor the genotype of the fox changes.
✅✅
C. The fox's genotype changes, but the phenotype does not.
D. Both the phenotype and genotype of the fox changes. - -A. The fox's
phenotype changes, but the genotype does not.
Genotypes can never change you either have it or dont
but phenotypic plasticity means that a genotype can make different variations of
phenotypes depending on the environmental conditions
Which of the following structures is a flap of cartilage that prevents the movement of
food into the trachea?
A. Glottis
B. Pharynx
✅✅
C. Epiglottis
D. Larynx - -C. Epiglottis
If a portion of a strand of DNA bases read 5' AGCTAGCGT 3', what would the
sequence of bases on the complementary strand read?
A. 5' TCGUTCGCU 3'
B. 5' UCGAUCGCA 3'
✅✅
C. 3' AGCTAGCGT 5'
D. 3' TCGATCGCA 5' - -D. 3' TCGATCGCA 5'
complementary is DNA to DNA (so A=T , T=A, C=G, G=C) also its 3' to 5' for a 5' to
3' prime DNA
if its DNA to RNA then replace any A with U as the complementary RNA also its 3' to
5' for a 5' to 3' prime DNA
How many times larger is the volume of a cube that is 4 mm on all sides compared
✅✅
to the volume of a cube that is 2 mm on all sides (Round the answer to the nearest
whole number) - -volume of a cube is side times side times side or side^3
4 times 4 times 4 or 4^3 = 64 mm^3
2 times 2 times 2 or 2^3 = 8 mm^3
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