CHEM AND BIO HELP AND TIPS HERE

[Moonlyte]

NOV 2006 q5c

its a an example of genetic engineering as the gene that enables de the plants to pump salt out of de root is removed 4rm one species and inserted into another plant its den allowed 2 reproduce n  de genetic engneers make this gene efficient as   b4 de plant gets modified not DAMAGED de salts are pump up it doesnt get accumulated in de plant de get used up  

Outline how enzymes can be manufactured for use in biological washing powders. de answer 4 this is
two types of microorgansiums can be used to manfacture enzymes fungi and bacteria using the fermenter it is a large sterile container with a stirrer and a  pipe to add feedstock (molasses or steep liquor) and air pipes to blow air into de mixture. the microorgansium r added n de liquid is maintained at 26*C and a ph 5-6 de enzymes produced may be extracellular( de extracted by filtering from de feedstock)or intracellular  (filtered 4rm feed stock den crushed and washed wid water. de enzymes r noe in solution

thanks!

[Syed Kazim]

No, i dont think they can absorb water by active transport. It only implys for minerals which is essential for the plant...  

Yup... exactly what I said.

[thenewkid™]

From syllabus:
'describe the advantages and disadvantages of breast-feeding compared with bottle-feeding using formula milk'

i know two advantage of breast milk is that the milk have antibodies and balnced diet, anymore advantage?

are the only disadvantage of breast-feeding are social disadvantage(e.g. its not socially acceptable to breast-feed in public places)?

advantage of breast feeding:bond between mother and baby
disadvantage of bottled milk: they might be unsterilized and the baby might get sick
can never supply the baby with the right amount of everything
might not suit the baby

[Ivo]

Can someone tell me what the role and what hormones for menstrual cycle.  

Also, stuck on this question:

[Syed Kazim]

Can someone tell me what the role and what hormones for menstrual cycle.  

Also, stuck on this question:

Oestrogen - It is from the ovary, stimulates division of cells lining uterus which thickens - its blood supply increases.
Progesterone - It is from the corpus luteum, it maintains the thickening of the lining of the uterus.

[Burhan.arshad]

please explain ether linkages and how ether is formed.....

[Syed Kazim]

Can someone tell me what the role and what hormones for menstrual cycle.  

Also, stuck on this question:

Hormonal method of birth control
A pill is consumed everyday which contains the female sex hormones oestrogen and progesterone. The hormones are like those that are made when a woman is pregnant, and stop egg production.

Chemical method of birth control
Chemicals called spermicides, which kill sperms, are used. They are best used in combination with another method.

[ambitious94]

Can someone tell me what the role and what hormones for menstrual cycle.  

Also, stuck on this question:

Fertility drugs:
LH- Luteinizing Hormone- used to stimulate ovulation, and cause multiple release of ova
FSH: causes the development of Graafian follicles in the ovaries
Chemical methods of Birht Control:
Oestrogen: prevents release of LH, hence preventing ovulation.
Progesterone: Maintains the lining of the uterus, and prevents it from shedding. Also inhibits release of FSH and hence development of follicles.

[Syed Kazim]

please explain ether linkages and how ether is formed.....

Carboxylic acids react with alcohols to form esters. Concentrated sulphuric acid is used as a catalyst in this reaction.

ethanoic acid + ethanol will give ethyl ethanoate + water. This is a reversible reaction.


For more information on esters, go to Page 283 of the Chemistry Revision Guide that I got from SF itself. The link will allow you to download the guide from The Nightdreamer Inc.

[Ivo]

Fertility drugs:
LH- Luteinizing Hormone- used to stimulate ovulation, and cause multiple release of ova
FSH: causes the development of Graafian follicles in the ovaries
Chemical methods of Birht Control:
Oestrogen: prevents release of LH, hence preventing ovulation.
Progesterone: Maintains the lining of the uterus, and prevents it from shedding. Also inhibits release of FSH and hence development of follicles.

By the way, are follicle and ovum the same thing?  Which is released every month?

[Syed Kazim]

Fertility drugs:
LH- Luteinizing Hormone- used to stimulate ovulation, and cause multiple release of ova
FSH: causes the development of Graafian follicles in the ovaries
Chemical methods of Birht Control:
Oestrogen: prevents release of LH, hence preventing ovulation.
Progesterone: Maintains the lining of the uterus, and prevents it from shedding. Also inhibits release of FSH and hence development of follicles.

I checked the Mary Jones textbook and this is the explanation given for chemical birth-control (not the exact wording):

Chemical method of birth control
Chemicals called spermicides, which kill sperms, are used. They are best used in combination with another method.

Maybe the wording used in the question was wrong? Because in the Mary Jones text book the method where hormones are used is called the Hormonal method.

[Helium]

Question:

Syntheic plant hormones behave in a similar way to auxins. Describe how synthetic
plant hormones are effective as weedkiller. Help anyone

[Raywin]

Question:

Syntheic plant hormones behave in a similar way to auxins. Describe how synthetic
plant hormones are effective as weedkiller. Help anyone

The synthetic hormones "over-grow" these weeds and eventually these weeds die. thts all..

[aangel42]

Can anyone clarify the functions of the hormones involved in the menstrual cycle?
LH, FSH, progesterone, and estrogen? It's really confusing...
Also, what's a follicle and what's a corpus luteum???

[Burhan.arshad]

Carboxylic acids react with alcohols to form esters. Concentrated sulphuric acid is used as a catalyst in this reaction.

ethanoic acid + ethanol will give ethyl ethanoate + water. This is a reversible reaction.


For more information on esters, go to Page 283 of the Chemistry Revision Guide that I got from SF itself. The link will allow you to download the guide from The Nightdreamer Inc.

i am asking about ethers.....not esters.....