Photosynthesis (5.1) Flashcards
State what all living organisms require
Constant supply of energy
State what photosynthesis begins with
Absorption of light energy by chlorophyll
State the word overall inputs of photosynthesis
carbon dioxide + water
State the word overall outputs of photosynthesis
glucose + water + oxygen
Provide the balanced equation of photosynthesis
6CO2 + 12H20 -> C6H12O6 + 6H2O + 6O2
State what a series of biochemical reactions is referred to as
Metabolic pathway
Provide 3 possible uses of glucose formed in photosynthesis
- immediate energy source
- storage as starch
- chemical starting point for the synthesis of complex compounds
State what the oxygen formed in photosynthesis may be used for
Aerobic cellular respiration
State the types of membranes present within the eukaryotic chloroplast
- outer membrane
- inner membrane
State in what part of a cell photosynthesis occurs in eukaryotic autotrophs
Chloroplasts
State what the outer and inner membranes of chloroplast regulate
Movement of materials into and out of the organelle
Provide 1 example of a photosynthetic prokaryotes
Cyanobacteria
Describe endosymbiosis and its’ relationship to chloroplasts
Proposes that chloroplasts are the descendants of cyanobacteria and were engulfed by eukaryotic cells two billion years ago (lived symbiotically)
State the first stage of photosynthesis
Light-dependent phase
State where light-dependent photosynthetic reactions occur
Thylakoid membrane of the granum within the chloroplast
State whether or not the light-dependent photosynthetic reactions require light
Reactions can only take place in the presence of light
State where the outputs of the light-dependent photosynthetic reactions end up
Released in the stroma of the chloroplast
State the second stage of photosynthesis
Light-independent phase
State how the coenzymes produced in the light-dependent stage of photosynthesis are involved in the light-independent stage
Provide energy required to drive biochemical pathway
State whether or not the second stage of photosynthesis requires light
Reactions can take place in the absence of light
State what is required in the second stage of photosynthesis
NADPH and ATP of the light-dependent reactions
State what is reduced to GAP in the Calvin cycle
Carbon dioxide
State what carbon dioxide is reduced to form in the Calvin cycle
GAP
State what happens once the GAP molecules are formed in the Calvin cycle
Leave chloroplast and move into cell cytosol
State what occurs when two GAP molecules join together
One glucose unit
State 2 phases of photosynthesis
- light-dependent
2. light-independent
Describe photosynthesis
The process in which nutrients are produced from carbon dioxide and water using light energy
Describe chlorophyll and outline its’ location within a cell
Green pigment found within the thylakoid membrane
Describe autotrophs
Living organism capable of synthesising all of its own food by photosynthesis or chemosynthesis
Describe heterotrophs
Living organism incapable of synthesising its own food (sources nutritional requirements from organic substances)
Provide 3 evidence-based statements supporting the bacterial origins of chloroplast
- Chloroplasts divide by binary fission like bacteria
- Both bacteria and chloroplasts have a set of single circular DNA
- Chloroplast ribosomes are more similar to bacterial ribosomes than cytoplasmic ribosomes
Describe the reaction of the light-dependent stage
Hydrolysis
Describe the reaction of the light-independent stage
Calvin cycle
State the enzyme involved in the catalysis of photosynthesis
Rubisco
Describe absorption spectrum
Set of wavelengths absorbed by a pigment
State the 5 types of chlorophylls
- chlorophylls a, b, c, d
- bacteriochlorophyll (prokaryotes)