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7 science EXAM 2024QUESTIONS WITH CORRECT DETAILED AND VERIFIED ANSWERSA GRADE
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7 science EXAM 2024/QUESTIONS WITHCORRECT DETAILED AND VERIFIED ANSWERS/
A+ GRADE
1). 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
excessive protons (h+) in the blood?
a. h2co3 --> co2 + h20
b. co2 + h20 --> h2co3
c. hco3- + h+ --> h2co3
d. h2co3 --> hco3- + h+
Ans: C. HCO3- + H+ --> H2CO3
2). 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+
Ans: D. H2CO3 --> HCO3- + H+
3). 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
Ans: B. Sublimation
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, 4). 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.
Ans: 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
5). 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.
Ans: 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.
6). 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.
Ans: 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)
7). 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
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, Ans: 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
8). 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.
Ans: D. Tendons attach skeletal muscles to bones.
ligaments is bone to bone
9). Which of the following is used to indicate mass?
a. mg
b. μm
c. cm^3
d. ml
Ans: A. mg
μm = length
cm^3 = volume
mL = volume
10). Histones are proteins associated with which of the following?
a. sperm cells
b. blood
c. dna
d. hair follicles
Ans: C. DNA
condenses the DNA into chromatin
11). 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
Ans: D. Myosin and Actin
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, 12). Which of the following bases is found in rna but is absent from dna?
a. adenine
b. uracil
c. cytosine
d. thymine
Ans: B. Uracil
13). 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.
Ans: 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
14). 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
Ans: 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)
15). 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
Ans: D. From lle-Gly-Phe to Leu-Gly-Phe
16).
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