Cellular Respiration Quiz

Name_________________________________

[1] Lactic acid fermentation is an aerobic process. true / false

Answer: false (anaerobic)

[1]Anaerobic fermentation is a more efficient process than aerobic respiration because it breaks glucose completely and releases lots more ATP. true / false

Answer: false (reverse is true)

[3]. In one part of our lab today, we plan to study aerobic respiration in _______ seedlings. In this process, oxygen and _________ are converted into carbon dioxide and ________. We cannot directly assess how much oxygen is taken up in this process, because the process generates ________ volumes of oxygen and carbon dioxide. To overcome this problem, we use the chemical _____________________ because it reacts with the carbon dioxide and converts it to a solid. Thus, as the reaction proceeds and the oxygen is used up, a lower pressure environment is created, causing ______________ enter the vial, allowing us to indirectly determine how much oxygen has been consumed by the seedlings.

Answers: pea / glucose / water / equal / KOH / water

[2.5] In a second part of our experiment today, we plan to study anaerobic respiration in _________. This process produces ___________________, energy, and carbon dioxide. Today, to roughly test the efficiency of this respiratory activity, we shall measure the volume of ____________ bubbles formed during the process. Later on, we shall examine the inhibition of this process with the chemical _____________ and the reversing of this inhibitory effect with the chemical ________________

Answer: yeast / ethanol / carbon dioxide / sodium fluoride (NaF) / magnesium sulfate (MgSO₄)

[2 correct ranks and explanations=1/2; 3=1; 4=1.5; 4=2] The effects of the following chemical combinations on the initial speed of alcoholic fermentation will be tested today. Please number each combination on a scale of 0-4 (0=no reaction; 4=most immediate reaction):

Abbr	Chemicals	Comparative Speed	Brief explanation in words
A	glucose and yeast
B	sucrose and yeast
C	water and yeast
D	starch and yeast
F	glucose and NaF and yeast

Answer:

Abbr	Chemicals	Comparative Speed	Brief explanation in words
A	glucose and yeast	4	Glucose readily enters cells, enzyme need not be induced
B	sucrose and yeast	2?	Enzymes goes out of cell, breaks it down, then mono-saccharide enters—this takes some time
C	water and yeast	0	This is a control—no raw materials, no respiration
D	starch and yeast	0	This species of yeast cannot use starch
F	Glucose and NaF and yeast	0-2?	NaF inhibits alcoholic fermentation by uptaking Mg, which is required by some of the enzymes that facilitate the reaction