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BLG1501 solution for assignment 2

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BLG1501 solution for assignment 2
BLG1501/201/S2/2012

DEPARTMENT OF LIFE AND CONSUMER SCIENCES

BLG1501
SEMESTER 2
TUTORIAL LETTER 201/2012

ASSIGNMENT 02
MEMORANDUM

2
BLG1501/201/S2/2012

Dr Monde Nyila 011 471 2294 e-mail: nyilama@unisa.ac.za

Question 9.1: What is the summarised equation for cellular respiration?

(6)

Answer:
Organic compounds + Oxygen → Carbon dioxide + Water + Energy
OR
C6H12O6 + 6O6 → 6C02+ 6H20 + Energy (ATP + heat)

Question 9.6: Explain why ATP is required for the preparatory steps of glycolysis.(2)
Answer:
ATP is used to phosphorylate the fuel molecules.
Question 9.12: Compare in tabulated form the processes of fermentation and cellular respiration.

(6)

Answer:
Fermentation
The final electron acceptor is an

Cellular respiration
The final electron acceptor is oxygen

organic molecule pyruvate ( lactic acid fermentation) or acetaldehyde (alcohol fermentation) Harvests less energy

Harvests more energy

Yields 2 ATPs

Yields 38 ATPs

Anaerobic conditions

Aerobic conditions

3
BLG1501/201/S2/2012

Question 10.3: Make labelled drawings to illustrate the different phases of mitosis in an animal cell with two chromosomes.

(20)

Answer

Question 11.6: Tabulate the key differences between mitosis and meiosis.

(14)

Answer:
Mitosis

Meiosis

DNA replication occurs during

DNA replication occurs during

interphase before mitosis begins

interphase before meiosis 1 begins

One division

Two divisions

Synapsis does not occur

Synapsis occurs during prophase 1

Two daughter cells, each 2n and

Four haploid cells, each containing half

genetically identical to parent cell

as many chromosomes as the parent cell

Effects growth and repair

Produces gametes

4
BLG1501/201/S2/2012

Question 12.5: A purple flower with an unknown genotype is crossed with a white flower. Determine the genotype of the purple flower if purple (P) is dominant and white (p) is recessive.

(20)

Answer:
P-generation:
The purple flower must have the P-allele because purple is dominant. We do not know
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