Random Flashcards
Chitin
- Polymer of glucosamine
- Present in cell wall of fungi
- Exoskeleton of arthropods
Denaturation of DNA
- 95 degrees celcius or
- Strong bases (con. NaOH)
Prosthetic groups
Organic molecules tightly bound to enzymes which cannot be removed from the enzyme without damaging enzyme properties.
Act as electron or oxygen carriers in reactions.
Most of them are vitamins.
Examples of prosthetic groups
- FAD & FMN - FAD contain riboflavin (Vit B12). Recieves H+ during cellular respiration.
- Heam - Iron (Cu2+) contain. Prosthetic group of cytochrome oxidase
- Biotin/Vitamin H/coenzyme R - water soluble vit B7
Cyclic electron transport occurs in
- Photosynthetic bacteria and sulfur bacteria (only cyclic)
- Cyanobacteria and photosynthetic protists
- In bundle sheath cell chloroplast of C4 plants/
What is food chain?
Food chain is a sequence of feeding relationships through which the energy flows in the ecosystem / community
What is trophic level?
Trophic level is a step of a food chain through which energy of an ecosystem /community is transferred.
What is food web?
In an ecosystem/ community food chains are interconnected atdifferent trophic levels and form a food web.
What is gross primary productivity?
Gross primary productivity (GPP) is the total amount of light energy convertedto chemical energy by a unit area within a unit time by the primary producers(includes respiratory energy). Given by KJ m-2 yr-1 or g m-2 yr-1
What is primary production?
Primary production is the amount of light energy converted to chemical energywithin a given period by the primary producers.
What is net primary productivity?
Net primary productivity (NPP) is the amount of biomass produced by primaryproducers by a unit area within a unit time [excludes respiratory energy( R)].Given by KJ m-2 yr-1 or g m-2 yr-1
What are ecological pyramids?
Graphical / diagrammatical representation of feeding relationships of an ecosystem.
Food borne diseases are of 2 types. What are they?
- Food borne infections
2. Food intoxication
What is food borne infections?
In food borne infections the contaminating microorganisms enters the body of the person eating spoiled food, and grow inside the host, multiplying in numbers and also produce toxins which cause symptoms of the characteristic disease.
What is food intoxication?
In food intoxication, spoiled food already contains toxins which have been produced due to microbial growth. Any person who eats such contaminated food containing toxins will develop symptoms of the disease within a short time.
