WorksheetsTPD ZOOLOGY - PHASE 3 ASSESSMENT
Total questions: 20
Worksheet time: 20mins
In Immunology, what is the term for the process by which a mature T Cell recognizes self-antigens and undergoes programmed cell death to maintain self-tolerance.
. Clonal Expansion
Negative Selection
Positive Selection
Allergy
What is biological evolution?
Development of amino acids from physio-chemical reactions.
Development of DNA from nucleotides.
Development of a cell from biomolecules.
Development of organism through time.
A horse has a karyotype of 64 chromosomes and a donkey has a karyotype of 62 chromosomes. The hybrid offspring of a horse-donkey cross is a mule, which has 63 chromosomes. A mule is sterile because it cannot successfully
court other mules
copulate with mules, donkeys or horses
form gametes
complete development of the zygote
Select the false statement from the following.
Darwinian variations are small and directional.
Saltation is a single large step mutation.
Branching descent and natural selection are the two key concepts of Darwinism.
Mutation is random and progressive in nature.
Which one of the following immunoglobulins is highly present in patients with asthma
IgA
IgG
IgE
IgM
Which one of the following statements about Natural Killer cell is wrong
They kill cancer cells
They release gamma interferons
They produce perforins
They kill cells that are infected by bacteria
Which one of the following statements exemplifies best about the immune system.
Memory of the previous foreign infections
Controlling the response after eliminating infectious agents.
Differentiate between self and foreign molecules
Identifying and fighting against infections
A beehive is highly contradictory to which of the following assumptions of Hardy Weinberg law?
No mutation.
Random mating
No gene flow
Huge population size
Marsupials in Australia and Placental mammals in North America provide an example for
Divergence
Saltation
Adaptive radiation
Convergence
Which one of the following pairs have professional antigen presenting cells
Neutrophils and B Cells
Dendritic cells and Macrophages
Mast cells and dendritic cells
Macrophages and mast cells
Which one of the following pairs is a part of the myeloid porogenitor
B Cells and Basophils
Eosinophils and NK cells
Dendritic cells and T Cells
Macrophages and Neutrophils
Which one of the following is a primary lymphoid organ
Payer's patches
Spleen
Bursa of Fabricius
Lymph nodes
Find the wrong statement
Adjuvants are used to enhance immunogenicity
Haptens are low molecular weight immunogens
An immunogen can elicit humoral response
Epitope is the portion of antigen recognized by antibodies
The first living organisms on earth were……
Chemohetetrophs
chemoautotrophs
photohetetrophs
Photoautotrophs
Which of the following best explains why a population is described as the evolutionary unit
Genetic changes can occur only at the population level.
The gene pool in a population remains fixed over time.
Natural selection affects individuals, not populations
Individual cannot evolve, but population can.
The antigen binding site of IgG molecules have
Light chains
Heavy Chains
Light and Heavy chains
Constant region
The organ that shrinks at adolescence and completely disappears in adulthood
Thymus
Adenoid
Tonsils
Appendix
Which of the following is a true statement?
The primitive atmosphere had 20 per cent oxygen, just like it is today.
The reducing primitive atmosphere contributed to the origin of life and the oxidizing one today would hinder it.
The primitive atmosphere was an oxidizing one and today's is a reducing one, making photosynthesis possible.
It took so long for prokaryote evolution because the primitive atmosphere screened out the ultraviolet radiation from the sun.
Which of the following statements best exemplifies about the difference between natural and artificial selection
Artificial selection is a rapid process while natural selection is a slow process
Natural selection produces huge biological diversity while artificial selection favours a few selected traits
Natural selection increases the species chance for survival in its natural environment while artificial selection may not.
The selection pressure for artificial selection is human – Environmental pressures exert selection pressure on natural selection
What prokaryotic adaptation occurred during the oxygen revolution and opened the possibility for energy demanding multicellular lifeforms?
Electron transport systems
Anaerobic fermentation
Cellular respiration
Photosynthesis
