In which of the following steps of glucose metabolism is the greatest number of ATP molecules produced?
Question 4 options:
The Citric Acid Cycle
Save Question 5 (5 points)
Where does glycolysis take place in eukaryotic cells?
Question 5 options:
mitochondrial inner membrane
Plant cells produce one molecule of O2 ____.
Question 6 options:
by splitting carbon dioxide.
by splitting two molecules of water.
during cellular respiration.
by breaking down glucose.
Save Question 7 (5 points)
Plants manufacture glucose _______
Question 7 options:
for exclusive use by animals.
to function as the beginning of more complex molecules.
as a by-product produced as the plant manufactures oxygen.
during cellular respiration.
SaveQuestion 8 (5 points)
CO2 + H2O + light energy –> C6H12O6 + O2
In the chemical reaction above, what does C6H12O6represent?
Question 8 options:
A water molecule
A chlorophyll pigment
An oxygen molecule
A simple carbohydrate
Save Question 9 (5 points)
In which reaction is CO2 required?
Question 9 options:
The light reaction
Neither the light reaction nor the Calvin cycle.
The Calvin cycle
In both the light reaction and the Calvin cycle
Plant cells ______.
Question 10 options:
do not have chloroplasts because their mitochondria meet their energy needs.
use carbon dioxide but do not use oxygen.
have both chloroplasts and mitochondria.
do not have mitochondria because their chloroplasts meet their energy needs.
Save Question 11 (5 points)
You are playing a long tennis match and your muscles begin to switch to anaerobic respiration. Which of the following is NOT true?
Question 11 options:
Your cells start converting NAD+ to NADH.
Lactic acid is produced.
There is a lack of oxygen in your muscle cells.
ATP production declines.
Question 12 options:
NADH is produced
O2 is produced
NADP+ is produced.
O2 is used.
Save Question 13 (5 points)
According to the first law of thermodynamics, the total amount of energy in the universe ___________.
Question 13 options:
is always decreasing
varies up and down
is always increasing
Save Question 14 (5 points)
How do cells use the ATP cycle shown in the figure above?
Question 14 options:
Cells use the cycle primarily to generate heat.
Cells use the cycle to generate or consume water molecules as needed.
Cells use the cycle to recycle energy released by ATP hydrolysis.
Cells use the cycle to recycle ADP and phosphate.
Question 15 (5 points)
Where are the proteins of the electron transport chain located?
Question 15 options:
Mitochondrial outer membrane
Mitochondrial inner membrane
SaveQuestion 16 (5 points)
Energy that is not converted to useful energy (ability to do work) is usually given off as____.
Question 16 options:
Save Question 17 (5 points)
Question 17 options:
cannot be produced by fungi and heterotrophic organisms.
involves ATP in living organisms.
is the ability to do work.
usage is governed by the laws of thermodynamics.
all of these
Question 18 (5 points)
Why is adenosine triphosphate (ATP) important in cells?
Question 18 options:
It is assembled into long chains that make up cell membranes.
It accelerates diffusion.
It stores energy in an easily accessible form that can be used to do work.
It acts as an enzyme speeding up chemical reactions.
SaveQuestion 19 (5 points)
Why are enzymes important to humans?
Question 19 options:
Because they are proteins.
Because they can evade the laws of thermodynamics.
Because they allow reactions to occur at body temperature.
Because they increase body temperature.
Save Question 20 (5 points)
Which of the following statements is true?
Question 20 options:
An enzyme’s function depends on its three-dimensional shape.
Enzymes typically work on a broad range of substrates.
Enzymes are used up in chemical reactions.
Enzymes emerge changed from the reactions they catalyze.