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PSB Natural Science Exam Questions and Answers
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PSB Natural Science Exam Questions and Answers
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PSB Natural Science Exam Questionsand Answers
What is the name for any substance that stimulates the production of antibodies? -
Answers -antigen
List the cellular hierarchy from the simplest to the most complex structure.
(organism, organ, organ system, cell, tissue) - Answers -cell, tissue, organ, organ
system, organism
If a cell is placed in a hypertonic solution what will happen to the cell? - Answers -it will
shrink
Which group of major parts and organs make up the immune system? - Answers -
lymphatic system, spleen, tonsils, thymus, and bone marrow
The rate of a chemical reaction depends on all the following except
a. temperature
b. surface area
c. presence of catalyst
d. amount of mass loss - Answers -d. amount of mass loss
Which of the answer choices provided best defines the following statement? For a given
mass and constant temperature, an inverse relationship exists between the volume and
pressure of a gas.
a. Ideal Gas Law
b. Boyle's Law
c. Charles' Law
d. Stefan-Boltzmann Law - Answers -b. Boyle's Law
Which of the following statements correctly compares prokaryotic and eukaryotic cells?
a. Prokaryotic cells have a true nucleus, eukaryotic cells don not.
b. Both prokaryotic and eukaryotic cells have a membrane.
c. Prokaryotic cells do not contain membrane-bound organelles, eukaryotic cells do.
d. Prokaryotic cells are more complex than eukaryotic cells. - Answers -c. Prokaryotic
cells do not contain membrane-bound organelles, eukaryotic cells do.
What is the role of ribosomes?
a. make proteins
b. waste removal
c. transport
,d. storage - Answers -a. make proteins
If an organism is AaBb, which of the following combinations in the gametes is
impossible?
a. AB
b. aa
c. aB
d. Ab - Answers -b. aa
What is the oxidation number of hydrogen in CaH2?
a. +1
b. -1
c. 0
d. +2 - Answers -b. -1
Which hormone stimulates milk production in the breasts during lactation? - Answers -
Prolactin
What is the typical result of mitosis in humans? - Answers -two diploid cells
Which of the following does NOT exist as a diatomic molecule?
a. boron
b. fluorine
c. oxygen
d. nitrogen - Answers -a. boron
Which of the following structures has the lowest blood pressure?
a. arteries
b. arteriole
c. venule
d. veins - Answers -d. veins
How does water affect the temperature of a living thing? - Answers -Water keeps
temperature stable
What is another name for aqueous HI?
a. hydroiodate acid
b. hydrogen monoiodide
c. hydrogen iodide
d. hydriodic acid - Answers -d. hydriodic acid
Which of the heart chambers is the most muscular?
a. left atrium
b. right atrium
c. left ventricle
d. right ventricle - Answers -c. left ventricle
, Which of the following is not a product of the Krebs cycle?
a. carbon dioxide
b. oxygen
c. adenosine triphosphate (ATP)
d. energy carriers - Answers -b. oxygen
What is the name for the reactant that is entirely consumed by the reaction?
a. limiting reactant
b. reducing agent
c. reaction intermediate
d. reagent - Answers -a. limiting reactant
Which part of the brain interprets sensory information?
a. cerebrum
b. hindbrain
c. cerebellum
d. medulla oblongata - Answers -a. cerebrum
What kind of bond connects sugar and phosphate in DNA?
a. hydrogen
b. ionic
c. covalent
d. overt - Answers -c. covalent
Which of the following proteins is produced by cartilage?
a. actin
b. estrogen
c. collagen
d. myosin - Answers -c. collagen
How are lipids different than other organic molecules?
a. they are indivisible
b. they are not water soluble
c. they contain zinc
d. they form long proteins - Answers -b. they are not water soluble
Which of the following orbital is the last to fill?
a. 1s
b. 3s
c. 4p
d. 6s - Answers -d. 6s
Which component of the nervous system is responsible for lowering the heart rate?
a. central nervous system
b. sympathetic nervous system
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