Please answer questions 16-23. Thank you! Denaturation of an enzyme (a protein)
ID: 166734 • Letter: P
Question
Please answer questions 16-23. Thank you!
Denaturation of an enzyme (a protein) by heating does which of the following? a. renders it ineffective by changing its natural shape b. enhances its performance c. reduces its energy of motion d. nothing, all remains the same When carbon atoms are lost from molecules during respiration, they are given off in the form of: a. methane gas b. carbon dioxide c. carbon atoms d. pyruvic acid e. molecular oxygen In order for life to exist on earth, even today, entropy (the tendency for molecules to become disordered) must be overcome. The ultimate source of energy to keep the molecules of living things ordered, and therefore alive, comes from: a. fossil fuels b. heat in the earth's core c. wind energy d. heterotrophic organisms e. the sun 6CO_2 + 6H_2O rightarrow C_6H_12O_6 + 6O_2 is the general equation for: a. photosynthesis b. respiration ATP is used to: a. code messenger RNA b. couple exergonic to endergonic reactions c. transport phosphorus in the cell d. lower activation energy c. raise activation energies In the visible spectrum, the light of highest energy is: a. the light with the shortest wavelengths b. red light c. fluorescent light d. both a and b The most common molecules in cells are: a. Carbohydrates b. Water c. Proteins d. Lipids e. Salts The most important result of the light-independent (or Calvin Cycle) reactions is: a. the addition of phosphate to sugar to form sugar phosphate b. the synthesis of sugar from CO_2. c. the change of chlorophyll from green to colorless d. the transfer of electrons to glucose molecules e. the rearrangement of sugar molecules to form O_2 from H_2OExplanation / Answer
Ans 16: a) Denaturation by heat increases the kinetic energy which leads to change in the shape of an enzyme (it's active site ) which makes the enzyme inactive.
Ans 17: b) carbon atom of intermediate metabolic products during respiration are converted to carbon dioxide (CO2).
Ans18: e) The ultimate source of energy energy for living things comes from the sun.
Ans19: a) photosynthesis is a process by which plants and some bacteria use light energy (sunlight) to synthesize food from carbon dioxide and water and gives out oxygen as a byproduct.
Ans20: b) ATP is used to couple exergonic reaction to endergonic reactions.
Ans21: a) The light with the shortest wavelength i.e the violet light within visible spectrum has the highest energy.
Ans22: b) The most common molecules in the cell are water accounting for 70% or more of the total cell mass.
Ans 23: b) Calvin cycle is light dependent reaction which results in the synthesis of organic molecules like sugar from CO2.