What is the function of digestive enzymes?
Enzymes are the organic compounds produced by the living cells to carry forward the biochemical reactions in and outside the cells of the organisms. Some chemical reactions occurs by the enzymes known as catalysis and the substances by which these chemical reactions occurs known as catalytic compounds. Enzymes are of two types- intracellular enzymes or Extracellular enzymes. Intracellular enzymes remain inside the cell also known as endoenzymes. Extracellular enzymes leaves the cells and functions outside the cell also known as exoenzymes.
Extracellular enzymes contain digestive enzymes which help in the breaking down of the food. Digestive enzymes like- salivary amylase or ptyalin secreted by salivary gland in the oral cavity, pepsin (activated from pepsinogen by HCL), rennin (activated from prorenin by HCL), gastric lipase all three produced by the gastric glands in the stomach, pancreatic lipase, pancreatic amylase, DNase, RNase, trypsin (activated from trypsinogen by enterokinase), chymotrypsin (activated from chymotrypsinogen by trypsin) secreted from pancreas in the small intestine, lysozyme in tears, intestinal amylase, maltase, isomaltase, lactase, dipeptidase, intestinal lipase, nucleotidase, nucleosidase, enterokinase they are produced from the intestinal gland in the small intestine.
Why is diffusion insufficient to meet the oxygen requirements of multi-cellular organisms like humans?
How is the amount of urine produced regulated?
What are the different ways in which glucose is oxidised to provide energy in various organisms?
What criteria do we use to decide whether something is alive?
The breakdown of pyruvate to give carbon dioxide, water and energy takes place in
(a) cytoplasm. (c) chloroplast.
(b) mitochondria. (d) nucleus.
What are the differences between autotrophic nutrition and heterotrophic nutrition?
What are the components of the transport system in highly organised plants?
What would be the consequences of a deficiency of haemoglobin in our bodies?
What are outside raw materials used for by an organism?
What advantage over an aquatic organism does a terrestrial organism have with regard to obtaining oxygen for respiration?
Did Döbereiner’s triads also exist in the columns of Newlands’ Octaves? Compare and find out.
What is a good source of energy?
What are trophic levels? Give an example of a food chain and state the different trophic levels in it.
What changes can you make in your habits to become more environment-friendly?
What is the difference between a reflex action and walking?
What is the importance of DNA copying in reproduction?
If a trait A exists in 10% of a population of an asexually reproducing species and a trait B exists in 60% of the same population, which trait is likely to have arisen earlier?
Why should a magnesium ribbon be cleared before burning in air?
Define the principal focus of a concave mirror.
You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively. If you are given only red litmus paper, how will you identify the contents of each test tube?
You are given a hammer, a battery, a bulb, wires and a switch.
(a) How could you use them to distinguish between samples of metals and non-metals?
(b) Assess the usefulness of these tests in distinguishing between metals and non-metals.
A solution turns red litmus blue, its pH is likely to be
(a) 1 (b) 4 (c) 5 (d) 10
Which of the following pairs will give displacement reactions?
(a) NaCl solution and copper metal
(b) MgCl2 solution and aluminium metal
(c) FeSO4 solution and silver metal
(d) AgNO3 solution and copper metal.
What effect does the concentration of H+(aq) ions have on the nature of the solution?
How does chemical coordination occur in plants?
How would you distinguish experimentally between an alcohol and a carboxylic acid?
Asexual reproduction takes place through budding in
(a) amoeba.
(b) yeast.
(c) plasmodium.
(d) leishmania.
What will happen if we kill all the organisms in one trophic level?
What is meant by saying that the potential difference between two points is 1 V?
What are the changes seen in girls at the time of puberty?