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1. Bacteria A and Bacteria B are considered hardy bacteria and can survive in extreme environments when grown individually. However, when they are grown together in a closed environment (on an agar plate), Bacteria A thrives, while Bacteria B eventually dies off.
Assume the population of Bacteria B completely dies off. Bacteria A are now transferred to an open environment where they have lots of room for growth and a continual supply of food. Over the course of three days, the population of bacteria steadily increases as follows:
Day 1: 1500 bacteria
Day 2: 3000 bacteria
Day 3: 7000 bacteria
Day 4: 13,000 bacteria
Is this population of bacteria r-selected or k-selected? Explain how you arrived at your answer. Hint: Review your definitions of “r” and “k.” (2 marks)
The importance of the Krebs cycle in cellular respiration lies in:
A) Release of oxygen
B) Formation of the Acetyl group
C) Movement of electrons towards the respiratory chain
D) CO2 removal
Yogurt is the result of lactic fermentation
A) True
B) false
It is the general equation of cellular respiration
A) Glucose = CO2 + O2
B) 6CO2 +6 H2O + solar energy = 6O2 + glucose
C) Glucose + O2 = CO2 + H2O + energy
In the Krebs cycle, carbons are lost, which are eliminated as
from:
A) CO2
B) Enzymes
C) H2O
D) Carbon
If pyruvic acid is NOT in the presence of O2, it follows a process called
A) Krebs cycle
B) Cellular respiration
C) Glycolysis
D) Fermentation
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