What factors affect the light dependent phase?
Factors that affect the light-dependent phase include light intensity / wave length / number of chloroplasts / water concentration / chlorophyll concentration.
How cyanide would affect both anaerobic and aerobic respiration?
Cyanide stops / slows aerobic respiration AND has no effect on anaerobic respiration. Cyanide / inhibitors would result in less ATP being made.
What is NCEA photosynthesis?
Photosynthesis is the process in which plants use sunlight to produce glucose. Light dependent reaction takes place in the thylakoid membrane within the chloroplast.
What is an example of light-dependent?
Calvin cycle
Light-dependent Cycle happens in the thylakoid membrane of the chloroplast. In this reaction, by using water, chlorophyll absorbs the energy from the sun and transforms it into chemical energy. Water (H2O) is split and oxygen (O2) comes out as a by-product.
What is the main purpose of the light-dependent reactions?
The light-dependent reactions convert light energy into chemical energy. The goal of the light-dependent reactions of photosynthesis is to collect energy from the sun and break down water molecules to produce ATP and NADPH. These two energy-storing molecules are then used in the light-independent reactions.
How does cyanide stop ATP production?
What effect would cyanide have on ATP synthesis? After cyanide poisoning, the electron transport chain can no longer pump electrons into the intermembrane space . The pH of the intermembrane space would increase, the pH gradient would decrease, and ATP synthesis would stop.
Why does cyanide stop respiration?
The toxicity of cyanide is linked mainly to the cessation of aerobic cell metabolism. Cyanide reversibly binds to the ferric ions cytochrome oxidase three within the mitochondria. This effectively halts cellular respiration by blocking the reduction of oxygen to water.
How does stroma Maximise the rate of photosynthesis?
Stroma is a clear fluid, which doesn’t block the light. Chloroplasts have thin membranes / large surface area for absorption of light. The combination of the cell and organelle structure and location collectively helps to keep photosynthesis at its maximum potential rate.
What factors affect the rate of mitosis?
Other factors that may affect the mitotic rate are salinity, temperature, mineral limiting factors, pH, roundworms, soil bac teria or fungus, other plant hormones, amount of light, acetaminophen, aspirin, ibuprofen, vitamins and minerals, heavy metals, antibiotics, and certain plant competitors that excrete inhibiting …
What are the 7 steps of light-dependent reactions?
Terms in this set (7)
- (1st Time) Energy is absorbed from the sun.
- Water is broken down.
- Hydrogen ions are transported across the thylakoid membrane.
- (2nd Time) Energy is absorbed from the sun.
- NADPH is produced from NADP+.
- Hydrogen ions diffuse through the protein channel.
- ADP becomes ATP.
What are the 5 steps of light-dependent reactions?
13.5: The Light-dependent Reactions
- Photosystems Absorb Light Energy.
- Electrons Move Down the Electron Transport Chain, Providing Energy to Pump Protons into the Thylakoid Lumen.
- Photophosphorylation.
- Water Photolysis.
- Reduction of NADP+
What is the example of light-dependent reaction?
What is another name for light-dependent reactions?
The light-dependent reactions; The light-independent reactions, or Calvin Cycle.
Which enzyme is inhibited by cyanide?
cytochrome c oxidase
Abstract. Acute cyanide toxicity is attributed to inhibition of cytochrome c oxidase (CcOX), the oxygen-reducing component of mitochondrial electron transport; however, the mitochondrial action of cyanide is complex and not completely understood.
How many people can smell cyanide?
The odors associated with cyanide-containing compounds can not be relied on as an adequate warning of hazardous concentrations. Between 20 and 40 percent of the population does not carry the gene needed to detect the odor of cyanide.
What is the taste of cyanide poison?
We all know that cyanide tastes like almonds.
What is stroma function?
Stroma is the fluid filling up the inner space of the chloroplasts which encircle the grana and the thylakoids. In addition to providing support to the pigment thylakoids, the stroma are now known to contain chloroplast DNA, starch and ribosomes along with enzymes needed for Calvin cycle.
Which plant has the highest rate of photosynthesis?
The C4 plants show a high rate of photosynthesis as compared to C3 plants because photorespiration does not occur in C4 plants.
Which tissue has the highest rate of mitosis?
Cell Type & Location
Skin cells, hair follicles and the cells lining our intestines (epithelial cells) all have high rates of mitosis as these tissues constantly need to be replaced. In plants growth occurs largely at the shoot and root tips. These cells have much higher rates of mitosis than the rest of the plant.
What stimulates a cell to divide?
Mitogens, which stimulate cell division, primarily by relieving intracellular negative controls that otherwise block progress through the cell cycle.
What are the 3 products of light-dependent reactions?
The three products of light reaction of photosynthesis are ATP, NADPH and O2.
What are the 3 steps of light-dependent reactions?
These reactions occur within specialised membrane discs within the chloroplast called thylakoids and involve three steps: Excitation of photosystems by light energy. Production of ATP via an electron transport chain. Reduction of NADP+ and the photolysis of water.
What is the mechanism of action of cyanide?
What is cyanide’s mechanism of action? Cyanide has a high affinity for metals like cobalt and trivalent iron, and for sulfane compounds such as sodium thiosulfate which contains a sulfur-to-sulfur bond. In large doses, cyanide quickly binds with iron in cytochrome a3, preventing electron transport in the cytochrome.
Can you build immunity to cyanide?
Some of these toxic compounds include snake venom, ricin and opiates, to name but a few. Unfortunately, cyanide isn’t one of those substances. You simply cannot build up a natural tolerance to cyanide by using this method.
What is stroma example?
Examples of stroma include:
- stroma of iris.
- stroma of cornea.
- stroma of ovary.
- stroma of thyroid gland.
- stroma of thymus.
- stroma of bone marrow.
- lymph node stromal cell.
- multipotent stromal cell (mesenchymal stem cell)