1
BSC 215 UNIT 1 Questions with Answers
(100% Correct Answers)
If blood pressure is too high, what should homeostatic regulation do?
1) There will not be any homeostatic regulation.
2) Maintain the elevated blood pressure until a new set point is established.
3) Lower blood pressure back to the normal range.
4) Increase blood pressure so it can reach the desired set point. Answer: 3)
Lower blood pressure back to the normal range.
When you breathe, the pressure inside the lungs is different than the pressure
outside the lungs. This is an example of a(n) __________.
1) electrical gradient
2) concentration gradient
3) temperature gradient
4) pressure gradient Answer: 4) pressure gradient
The homeostatic mechanism, in which a stimulus changes the regulated
variable in one direction but the response changes the variable in the opposite
direction, is called a __________.
1) cell-cell communication
2) positive feedback loop
3) negative feedback loop
4) dynamic equilibrium Answer: 3) negative feedback loop
Positively charged subatomic particles are called __________.
,2
neutrons
nuclei
protons
electrons Answer: protons
Sodium has an atomic number 11 and 12 neutrons. Its mass number is
__________.
1
11
12
23 Answer: 23
Which of the following is NOT one of the four major elements found in the
human body?
carbon
nitrogen
oxygen
calcium Answer: calcium
Atoms that have the same number of protons but a different number of
neutrons are called __________.
trace elements
elements
,3
isotopes
isomers Answer: isotopes
Involve the transfer on electrons, which creates a positively charged ion and a
negatively charged ion. The two oppositely charged ions attract each other, and
this attraction is called __________. Answer: ionic bond
C2H8 is a(n) __________.
polar covalent molecule
nonpolar ionic molecule
nonpolar covalent molecule
ionic compound Answer: non-polar covalent molecule
The chemical properties of an atom--in other words how likely it is to form
bonds and what types of bonds it will form--depend on its __________.
valence electrons
mass number
total number of neutrons
number of protons Answer: valence electrons
Blood is a mixture that contains insoluble particles that are large enough to be
visible, such as blood cells and platelets. Blood is a __________.
solution
suspension
, 4
colloid
solvent Answer: suspension
Which of the following molecules contains polar covalent bonds?
CH4
H2O
H2
NaCl Answer: H2O
Neon has 10 electrons. Which of the following statements is true about neon?
It has 8 valence electrons and is unstable.
It has 10 valence electrons and is stable.
It has 8 valence electrons and is stable.
It has 2 valence electrons and is unstable. Answer: It has 8 valence electrons
and is stable.
A reaction in which the energy of the reactants exceeds the amount of energy
required for the reaction to proceed is called __________.
endergonic
anabolic
exchange
exergonic Answer: exergonic
BSC 215 UNIT 1 Questions with Answers
(100% Correct Answers)
If blood pressure is too high, what should homeostatic regulation do?
1) There will not be any homeostatic regulation.
2) Maintain the elevated blood pressure until a new set point is established.
3) Lower blood pressure back to the normal range.
4) Increase blood pressure so it can reach the desired set point. Answer: 3)
Lower blood pressure back to the normal range.
When you breathe, the pressure inside the lungs is different than the pressure
outside the lungs. This is an example of a(n) __________.
1) electrical gradient
2) concentration gradient
3) temperature gradient
4) pressure gradient Answer: 4) pressure gradient
The homeostatic mechanism, in which a stimulus changes the regulated
variable in one direction but the response changes the variable in the opposite
direction, is called a __________.
1) cell-cell communication
2) positive feedback loop
3) negative feedback loop
4) dynamic equilibrium Answer: 3) negative feedback loop
Positively charged subatomic particles are called __________.
,2
neutrons
nuclei
protons
electrons Answer: protons
Sodium has an atomic number 11 and 12 neutrons. Its mass number is
__________.
1
11
12
23 Answer: 23
Which of the following is NOT one of the four major elements found in the
human body?
carbon
nitrogen
oxygen
calcium Answer: calcium
Atoms that have the same number of protons but a different number of
neutrons are called __________.
trace elements
elements
,3
isotopes
isomers Answer: isotopes
Involve the transfer on electrons, which creates a positively charged ion and a
negatively charged ion. The two oppositely charged ions attract each other, and
this attraction is called __________. Answer: ionic bond
C2H8 is a(n) __________.
polar covalent molecule
nonpolar ionic molecule
nonpolar covalent molecule
ionic compound Answer: non-polar covalent molecule
The chemical properties of an atom--in other words how likely it is to form
bonds and what types of bonds it will form--depend on its __________.
valence electrons
mass number
total number of neutrons
number of protons Answer: valence electrons
Blood is a mixture that contains insoluble particles that are large enough to be
visible, such as blood cells and platelets. Blood is a __________.
solution
suspension
, 4
colloid
solvent Answer: suspension
Which of the following molecules contains polar covalent bonds?
CH4
H2O
H2
NaCl Answer: H2O
Neon has 10 electrons. Which of the following statements is true about neon?
It has 8 valence electrons and is unstable.
It has 10 valence electrons and is stable.
It has 8 valence electrons and is stable.
It has 2 valence electrons and is unstable. Answer: It has 8 valence electrons
and is stable.
A reaction in which the energy of the reactants exceeds the amount of energy
required for the reaction to proceed is called __________.
endergonic
anabolic
exchange
exergonic Answer: exergonic
