Get premium membership and access questions with answers, video lessons as well as revision papers.
-The Krebs Cycle describes how living cells generate the energy used by the body. It is associated with the process of aerobic respiration which, in animal cells, refers to the cellular conversion of one substance to another substance. Most commonly, this transformation refers to changing adenosine diphosphate (ADP) to adenosine triphosphate (ATP).
- The Kreb's cycle undergoes the following steps:
a)Before beginning the Krebs Cycle, pyruvic acid, a substance commonly found in fruits, undergoes a process called glycolysis, in which it is either converted into a carbohydrate or stored in fat cells. In technical terms, this carbohydrate is called acetyl-coenzyme A (acetyl-CoA). It is acetyl-CoA that undergoes the Krebs Cycle.
b)Acetyl-CoA combines with a molecule called oxaloacetic acid. Together, acetyl-CoA and oxaloacetic acid form what is commonly known as citric acid.
c)Acetyl-CoA loses its carbon atoms when combining with oxaloacetic acid. The lost carbon atoms from acetyl-CoA combine with oxygen and create CO2 molecules. These molecules are the first products of the Krebs Cycle. They are identical to those the catalysts, or initiators of glycolysis, and prepare the body to undergo glycolysis again.
d)Citric acid undergoes a series of reactions that change its molecular shape. During these reactions, citric acid releases hydrogen (H) molecules. These H molecules readily attach to two other molecules, nicotinamide-adenine-dinucleotide (NAD) and flavin-adenine-dinucleotide (FAD), creating NADH and the FADH2. These are the second products of the Krebs Cycle. They assist in electron transport.
e) The reactions that create NADH and FADH2 usually release ATP. While technically a “waste” product, ATP is nonetheless a product of the Krebs Cycle.
f)The acetyl-CoA eventually breaks completely down, leaving only NADH, FADH2, ATP, and oxaloacetic acid. Oxaloacetic acid is the final product of the Krebs Cycle. Like CO2, it prepared the body to undergo the Krebs Cycle a second time.
franco crick answered the question on January 31, 2018 at 15:55
- Differentiate between active immunity and passive immunity.(Solved)
Differentiate between active immunity and passive immunity.
Date posted: January 31, 2018. Answers (1)
- Define the term Serum as used in biological sciences.(Solved)
Define the term Serum as used in biological sciences.
Date posted: January 31, 2018. Answers (1)
- Define the term Chemiosmosis as used in biology.(Solved)
Define the term Chemiosmosis as used in biology.
Date posted: January 31, 2018. Answers (1)
- Describe the several applications of anthropometry in Kenya today.(Solved)
Describe the several applications of anthropometry in Kenya today.
Date posted: January 31, 2018. Answers (1)
- Outline the specialized anthropometric tools used in anthropometric measurements stating the measurements obtained after using them.(Solved)
Outline the specialized anthropometric tools used in anthropometric measurements stating the measurements obtained after using them.
Date posted: January 31, 2018. Answers (1)
- Define the term anthropometry as used in genetics.(Solved)
Define the term anthropometry as used in genetics.
Date posted: January 31, 2018. Answers (1)
- Define the following terms: a)Scientific name. b)Species. c)Taxonomy.(Solved)
Define the following terms: a)Scientific name. b)Species. c)Taxonomy.
Date posted: January 31, 2018. Answers (1)
- Describe in details the four types of dichotomous keys.(Solved)
Describe in details the four types of dichotomous keys.
Date posted: January 31, 2018. Answers (1)
- Define dichotomous key and give three functions performed by it.(Solved)
Define dichotomous key and give three functions performed by it.
Date posted: January 31, 2018. Answers (1)
- How do bacteria reproduce?
A. Sexual reproduction
B. Horizontal gene transfer
C. Binary fission
D. Mitosis(Solved)
How do bacteria reproduce?
A. Sexual reproduction
B. Horizontal gene transfer
C. Binary fission
D. Mitosis
Date posted: January 31, 2018. Answers (1)
- Which is not one of the three main shapes of bacteria?
A. Coccus
B. Bacillus
C. Spiral
D. Star(Solved)
Which is not one of the three main shapes of bacteria?
A. Coccus
B. Bacillus
C. Spiral
D. Star
Date posted: January 31, 2018. Answers (1)
- Define the following: (a) Prokaryote. (b)Binary fission. (c)Probiotic. (d)Horizontal gene transfer.(e) Eukaryotes.(Solved)
Define the following: (a) Prokaryote. (b)Binary fission. (c)Probiotic. (d)Horizontal gene transfer.(e) Eukaryotes.
Date posted: January 31, 2018. Answers (1)
- Outline the characteristics of insect-pollinated flowers.(Solved)
Outline the characteristics of insect-pollinated flowers.
Date posted: January 31, 2018. Answers (1)
- Describe in details the eleven organ systems found in a human body.(Solved)
Describe in details the eleven organ systems found in a human body
Date posted: January 31, 2018. Answers (1)
- Discuss the below cells under the following subheadings: (a)cell adaptations. (b)cell functions. (i)Skin cell (ii)Nerve cell (iii)Muscle cell (iv)Red blood cell (v)Root hair cell (vi)Sperm cell(Solved)
Discuss the below cells under the following subheadings: (a)cell adaptations. (b)cell functions.
i)Skin cell
ii)Nerve cell
iii)Muscle cell
iv)Red blood cell
v)Root hair cell
vi)Sperm cell
Date posted: January 29, 2018. Answers (1)
- Describe the adaptations of a mammalian ear to its functions.(Solved)
Describe the adaptations of a mammalian ear to its functions.
Date posted: January 29, 2018. Answers (1)
- Describe the adaptations of a mammalian eye to its functions.(Solved)
Describe the adaptations of a mammalian eye to its functions.
Date posted: January 29, 2018. Answers (1)
- What chemical compound is found in cassava 'root' present at the center making it unrawful.(Solved)
What chemical compound is found in cassava 'root' present at the center making it unrawful.
Date posted: January 29, 2018. Answers (1)
- State the post fertilization changes that occur in a vertebrate ovum (Solved)
State the post fertilization changes that occur in a vertebrate ovum
Date posted: January 26, 2018. Answers (1)
- Describe how a mammalian heart is structurally adapted to its
function(Solved)
Describe how a mammalian heart is structurally adapted to its
function
Date posted: January 26, 2018. Answers (1)