Quiz True and False

Question 1

How do autotrophs get their energy

Answer 1

Most autotrophs use photosynthesis to convert light energy from the sun into chemical energy.

Question 2

How do heterotrophs get their energy

Answer 2

heterotrophs: they obtain food by eating other autotrophs or by eating other other heterotrophs that feed directly on autotrophs.

Question 2

Function of chlorophylls

Answer 2

Chlorophyll b helps chlorophyll a to capture light energy, so it’s called an accessory pigment. Neither a nor b absorbs much green light. Located in thylakoids. Is a pigment.
Chlorophylls a and b create pigment by absorbing colour

Question 3

Location of light reactions AND dark reactions

Answer 3

light reactions: thylakoid disks
dark reactions: stroma or liquid of chloroplasts

Question 4

Chemiosmosis - how does it work?

Answer 4

Chemiosmosis is when energy to pump protons is supplied by excited electrons as they pass along the ETC of photosystem II . The concentration of protons inside the thylakoid is higher than in the stroma. Protons move down the concentration gradient from thylakoid to the stroma, which provides energy for ATP synthase. Protein then makes ATP by adding a phosphate group to adenosine, diphosphate, and ADP.

Question 5

chemiosmosis pt 2

Answer 5

Process by which ATP is synthesized (makes more energy). It relies on a concentration gradient of protons across the thylakoid membrane. Some protons are produced from the breakdown of water molecules inside the thylakoid. Other protons are pumped from the stroma to the interior of the thylakoid. The energy required to pump these protons is supplied by the excited electrons as they pass along the ETC of photosystem 2.
Eventually, the concentration of protons inside the thylakoid is higher than in the stroma. As protons move down the concentration gradient from the thylakoid to the stroma, they provide the energy to ATP synthase, a protein which makes ATP by adding a phosphate group to adenosine diphosphate, or ADP. ATP and NADPH provide energy for the second set of reactions (dark reactions) in photosynthesis.

Question 6

Carbon fixation - what does it mean?

Answer 6

When plants fix carbon atoms in the atmosphere to create organic compounds.

Question 7

Factors that affect the rate of photosynthesis

Answer 7

Light Intensity
Temperature
CO2 Level

Question 8

ATP production of glycolysis, fermentation, cellular respiration (see chart from notes)

Question 9

Purpose of the Krebs cycle - what does it do?

Answer 9

Breaks down acetyl CoA to produce C02, hydrogen, and ATP

Question 10

Krebs cycle

Answer 10

Named after Krebs (1900-1981), a German Jew !TQ! who left Germany prior to WWll and who won the Nobel Prize in 1953
1 glucose molecule causes TWO turns of the Krebs Cycle. TWO turns produces 6 NADH, 2 FADH2, 2 ATP and 4 CO2 molecules.
Krebs cycle produces the same amount of energy as glycolysis (2 ATP)

Question 11

Diagram that shows the different paths followed, depending on the absence or presence of oxygen