Question

Ans all the ques plz. Don't leave any of them.

1.) calculate the molecular mass of i) glucose ( C6 H12 O6 ) ii) ammonium oxide ( NH4OH )
2.) Differentiate between Amphibia and Reptilia on the basis of their characters
3.) Why does a person earlier infected with Cowpox, not get infected with Smallpox when exposed to it?
4.) Why is it difficult to make drugs against virus?
5.) Why is it easier to swim in sea water than in river water?

Points : 50

Answer 1

2.) Reptiles and amphibians are distantly related to each other but in spite of some similarities, they can be distinguished by their physical appearance and different stages of life.

Amphibians live "double lives" — one in water with gills and the other on land by growing lungs as they age. They are vertebrates and cold blooded (ectothermic). Early amphibians, a crucial link from fish to terrestrial reptiles, were the first animals to leave the sea and venture onto the land.

Reptiles (meaning "to creep stealthily under cover of darkness") are a group of animals that have scales (or modified scales), breathe air, and usually lay eggs. Most reptiles live on land and reproduce by laying eggs. Crocodiles, snakes, lizards, and turtles are all examples of reptiles.  

3.) Cowpox is an infectious disease caused by the cowpox virus. The virus, part of the orthopoxvirus family, is closely related to the vaccinia virus. The virus is zoonotic, meaning that it is transferable between species, such as from animal to human. The transferral of the disease was first observed in dairymaids who touched the udders of infected cows and consequently developed the signature pustules on their hands. Cowpox is more commonly found in animals other than bovines, such as rodents. Cowpox is similar to, but much milder than, the highly contagious and often deadly smallpox disease.

4.) Virus - genes on the move • Virus - poison or venom (latin) • acellular entities with genome enclosed in a protein coat (sometimes with membrane) • reproduce only within living cells • contain RNA or DNA, not both • cultured in living host or cell cultures.

5.) The salts dissolved in sea water make it more dense than fresh water. This means you float higher, making it easier to swim. The Dead Sea in Israel is extremely salty which provides so much buoyancy that you don't have to swim on water. 

Answer 2

1. 6*12+12*1+6*16(glucose)
=72+12+96
=180
1*14+4*1+1*16+1*1(NH4OH)
=14+4+16+1
=35
2.amphibians have moist skin whereas reptiles have dry skin.
amphibians have pigmentation on their body while reptiles doesn't have any pigmentation.
5.sea water have more salts than river water and thus helps us swim easily
4. viruses are acellular... they have their own machinery,they enters as host cell and therefore to kill these viruses we have to kill some of our cells.