Search found 11 matches

by nigel123
Fri May 04, 2007 4:07 pm
Forum: General Discussion
Topic: Carbon-14 isotope used in translocation
Replies: 1
Views: 3551

Carbon-14 isotope used in translocation

hi i have a question :

What are the advantages of using 14C as an isotope in translocation experiments? What are the advantages / usefulness of other carbon isotopes?
by nigel123
Tue Sep 13, 2005 3:39 pm
Forum: General Discussion
Topic: Respiration
Replies: 1
Views: 1898

Respiration

Dscribe what happens to the percentage of (a) water vapour (b) oxygen (c) Carbon dioxide in the air during breathing. What are the possible causes fro the change in percentage of (a) Water vapour (b) oxygen (c) carbon dioxide in the air during breathing? During breathing, what effects does the chang...
by nigel123
Sat Jul 16, 2005 2:00 pm
Forum: Botany Discussion
Topic: Type of Fertilization
Replies: 9
Views: 16324

Type of Fertilization

1. Which type of fertilization (self fertilization or cross fertilization) will improve genetic variability of plants? Give reasons.

2. Why do most flowering plants tend to overproduce seeds?
by nigel123
Thu May 26, 2005 3:53 am
Forum: General Discussion
Topic: digestion
Replies: 22
Views: 17918

digestion

Explain some ways in which your digestive system helps protect you against many pathogenic bacteria that may have contaminated the kinds of food you eat.
by nigel123
Wed May 25, 2005 1:21 pm
Forum: Human Biology
Topic: A Digestion Question
Replies: 20
Views: 14068

just curious..
in the mouth.. enzyme amylase is secreted to digest starch into maltose

The milk contains lactose a dissacharide. so is the lactose digested in the mouth by the amylase?
by nigel123
Wed May 25, 2005 12:54 pm
Forum: Human Biology
Topic: A Digestion Question
Replies: 20
Views: 14068

A Digestion Question

A glassful of whole milk contains lactose, proteins, butterfat (mostly triglycerides), vitamins and minerals. Explain what will happen to each component in your digestive tract.
by nigel123
Sat Apr 23, 2005 3:19 pm
Forum: Botany Discussion
Topic: Green Light in photosynthesis
Replies: 3
Views: 28484

Green Light in photosynthesis

Why is it significant that Photosynthesis does not occur in green light?
by nigel123
Fri Apr 08, 2005 1:35 pm
Forum: Botany Discussion
Topic: Mineral Nutrition In Plants
Replies: 8
Views: 18381

Mineral Nutrition In Plants

Which metallic element is most esential for plants?

A. Potassium
B. Calcium
C. Magnesium
D. Iron
by nigel123
Thu Apr 07, 2005 1:18 pm
Forum: Molecular Biology
Topic: Rennin and Pepsin
Replies: 2
Views: 15578

Rennin and Pepsin

The food in the stomach stimulates the gastric glands to secrete gastric juice into the stomach cavity. Gastric juice is made up of HCl and Rennin and Pepsin. These gastric enzymes are produced as inactive pepsinogen and prorennin which are converted by the HCl into active enzymes - pepsin and renni...
by nigel123
Sun Apr 03, 2005 7:09 am
Forum: General Discussion
Topic: Digestive Systems of Sheep, Koala & Humans
Replies: 1
Views: 20709

Digestive Systems of Sheep, Koala & Humans

The diet of koala consists eucalyptus leaves The diet of sheep consists of fibrous plants The diet of human consists of a wide range of plants, animals and animal products. 1. Humans have the shortest digestive system compared to its body length. how does this relate to its diet. 2. Sheep has the lo...
by nigel123
Thu Mar 17, 2005 5:27 am
Forum: General Discussion
Topic: Denaturation of enzymes
Replies: 3
Views: 109312

Denaturation of enzymes

When an enzyme is placed in temperatures too high or unfavourable pH, it denatures.

Can someone explain to me the changes in shape and tertiary structure of the enzyme during denaturation, and the breaking of hydrogen bonds part?

thanks.