A group of students set up an experiment to investigate a certain physiological process. The set up
|
Ions | Concentration in pond water | Concentration in cell |
Sodium | 50 | 30 |
Potassium | 2 | |
Calcium | 15 | 1 |
Chloride | 180 | 200 |
(i) Sodium ions
(ii) Potassium ions
(b) For each processes named in (a) (i) and (ii) above, state one condition necessary for the process to take place.
NUTRITION IN PLANTS AND ANIMALS
The diagram below shows chemical reactions I, and II which are controlled by enzymes respectively.
Introduction to Biology
Motor vehicles move, use energy and produce carbon dioxide and water. Similar characteristics occur in living organisms yet motor vehicles are not classified as living. List the other characteristics of living things that do NOT occur in motor vehicles.
- They reproduce
- They grow
- They respond to stimuli
K.C.S.E Biology Q & A - MODEL 2019PP2QN06
GRAPH PAPER
(b) Account for the rate of product formation for enzyme H between:
(i) pH 1.0 and 3.0
(ii) pH 3.0 and 7.0.
(c) From the graph, determine: .
(i) the pH value at which the rate of product formation of the two enzymes was the same
(ii) the value of the rate of product formation for enzymes H and J at the pH value stated in (c)(i) above
(iii) the optimum pH value for enzyme J
(d) State one variable that may lead to the change in the optimum rate of product-formation of the two enzymes.
(e) Suggest with a reason, the likely part of the human alimentary canal where enzyme H would be found.
pH 5 is the optimum pH value for activity of enzyme H; between pH 1 and 2 enzyme H/enzyme molecules are activated; Between pH 2 and 3 enzyme H (enzyme molecules) are denatured/destroyed; (. Enzyme is inactivated/ less active for denatured
(ii) Rate of product formation (sharply) decreases with increase in pH; Enzyme H is (not formed by increase in pH hence is denatured); No product forms above pH 4.0 to 7.0; because all enzymes (enzyme molecules) are denatured;
(c) (i) 4.0
(ii) 15.0 mg/hr
(iii) 7.0
(d) -Temperature
-Substrate concentration;
-Enzyme concentration;
-Cofactors
-Co-enzymes
-(Enzyme) inhibitors
(e) Stomach;
Acidic medium/Low pH
State one importance of irritability to living organisms.
Plasmodium vivax and Plasmodiuin ovale are transmitted by a mosquito. State with a reason whether the two organisms can interbreed.
They cannot interbreed; because they do not belong to the same species.
Make a diagram of a simple, bibbed leaf with a serrated margin.
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