Mock Exam Paper E Marking Scheme

Marking Scheme Mock Biology Exam L C 2015

Section A Answer any five questions

1

Any five answers.

Consists of chains of sugar units bonded together

(4)

Cellulose or chitin

(4)

Vitamin D

(4)

Rickets or Osteomalacia

(4)

Sudan III or Brown paper test

(4)

Formation of phospholipid membranes or producing steroid hormones or energy or storage

(4)

2

Where life can exist on Earth or all the ecosystems of the earth

(4)

Feeding level or energy level or position an organism occupies on the food chain

(4)

A qualitative survey records the presence or absence of a species in a habitat, a quantitative survey records the number of a certain species in a habitat.

2(2)

A=Producer, B= Primary consumer, C= Secondary consumer, D= Parasite

(4)

In contest competition, two individuals actively fight for a limited resource, with only one of the individuals getting the resource. In scramble competition, all of the individuals that are competing receive some of the limited resource.

2(2)

3

Mitosis is a form of nuclear division in which one nucleus divides to give two nuclei, each containing identical sets of chromosomes.

(4)

Anaphase

(4)

(A) Spindle fibres

(B) Centromere

(6)

Mitosis is used in reproduction of single cell organisms, and in growth and repair in multicellular organisms

(4)

Meiosis is used to produce sex cells or gametes in some human cells.

(2)

4

Antigens are structures on the surface of pathogens like bacteria and viruses that initiate an immune response. Antibodies are proteins produced by lymphocytes in response to antigens.

2(2)

Osteoclasts breakdown bones into calcium which then enters the bloodstream. Osteoblasts forms new bone tissue.

2(2)

mRNA is messenger RNA which carries the genetic transcript from the genome to the ribosome where it is translated into protein. tRNA is transfer RNA which carries amino acids to the ribosome during translation to form proteins.

2(2)

Diploid cells contain two copies of each chromosome. Haploid cells contain only one copy of each chromosome

2(2)

Geotropism is the growth of plant...

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