Chapter 4 Homework Questions
Question 1
• Autotrophs – make their own food- cactus
• Heterotrophs – consume their food - you
Question 2
• ATP is the fuel for our cells.
• Adenosine triphosphate
– Adenine
– Ribose
– 3 phosphates
– The energy is in the bonds.
Question 3
• ATP
ADP + P + Energy
• Energy is the result.
Question 4
ATP has one more phosphate than ADP.
ATP has more energy because it has more bonds
and energy is in the bonds.
Question 5
• Hydrolysis is when a water molecule breaks a
bond. For example, making a polysaccharide a
monosaccharides.
• Dehydration synthesis is when a water
molecule is removed and combines molecules
together.
Question 6
• Photosynthesis is turning light energy into
chemical energy (glucose) with the use of
chloroplast.
Question 7
• 6 CO2 + 6 H2O + Light
C6H12O6 + 6 O2
Question 8
• The scientist that discovered the exact process
of photosynthesis in 1950. He earned a nobel
prize for his research. He used radioactive
isotopes in Carbon and Oxygen to discover the
process.
Question 9
• Chlorophyll is a green pigment found in
chloroplast that is the primary catalyst of
photosynthesis. Chlorophyll is a molecule that
absorbs light energy and the chlorophyll
molecule loses electrons.
• Chlorophyll “a” molecule is responsible for
converting most of the energy to chemical
energy.
Question 10
• Between 500 to 600 nm .
• Reflect green light.
Question 11
• Light reaction- takes place on the thylakoid
membrane. Input is H2O and Light. The
output is NADPH and ATP. O2 is released as
waste.
• Calvin Cycle – Takes place in the Stroma, input
is NADH and ATP from the light reaction.
Need CO2 from the atmosphere and output is
2 PGAL molecules (sugar). ADP +P and NADP
is released back for the light rxn.
Question 12
• PGAL is phosphoglyceraldehyde is a 3 carbon
molecule (sugar) that is produced in the calvin
cycle. 2 of these make a glucose molecule.
• RuBP is Ribulose Bisphosphate and it is the
compound that is found in the calvin cycle. It
is found at the beginning and end of the calvin
cycle.
Question 13
•
•
•
•
Correct temperature
Right wavelengths and intensity of light
Sufficient CO2
Enough H2O
Question 14
• C3 Pathway the normal pathway and called
this because a 3 carbon molecule is produced
(PGAL)
• C4 Pathway is the pathway of plants that open
their stomata partially during the day. They
make a 4 carbon molecule instead of the 3
carbon molecule. Ex. corn or crabgrass
• CAM – Open their stomata at night and close
during the day. Ex. Pineapples and Cactus