SINDH MDCAT 2019

1. Cell permeability and transport processes of Cell Membrane depend upon its _____ component.

Carbohydrates

Phospholipid

Cellulose

Polysaccharide

2. Which disorder among the following CANNOT be detected by amniocentesis?

Haemophilia

Tay-Sachs disease

Heart defects

Cystic fibrosis

3. What is phenomenon shown in the following picture ?

Senescence

Apical dominance

Ripening

Abscission

4. In a laboratory while working on a new species of fish, it is found that the fish has two varieties, red and brown. It was determined by another group of scientists in another laboratory that brown is a dominant color in this species. If we have brown fish with Us in the laboratory, how can we determine whether they are homozygous or heterozygous for the trait?

Breed this fish with a red fish and check F2 generation

Breed this fish with a brown fish and check F2 generation

Breed this fish with a red fish and check F1 generation

Breed this fish with a brown fish and check F1 generation

5. Which one is NOT true for co-ordination in animals?

Transmission by the nervous system is short-lived, whereas transmission by the hormonal system is long-lasting

In nervous system, secretory chemicals arc released in blood while in hormonal system; secretory chemicals are released in extracellular

The nervous system uses electrical impulses to send signals through neurons, whereas the hormonal coordination uses chemical messengers transported into blood

Responses are often permanent in the hormonal system, but temporary and reversible in the nervous system

6. Plant pigments responsible foe red, yellow and orange colors in many fruits and vegetable’s are:

Chlorophyll a

Carotenoids

Chlorophyll b

Cellulose

7. What does the following picture show?

Nerve

Motor Neuron

Sensory neuron

Inter neuron

8. As a result of competition among friends, Ahmed eats a lot of pakoras, resulting in rise of salts in blood, to compensate, _____ mechanism will be triggered in the body.

Positive feed back

External feed back

Internal feed back

Negative feed back

9. Due to the presence of _____ the reabsorption of water is increased in the collecting ducts

High pH

Kidney stones

ADH

10. When a color blind male marries a normal female, what will be the chances of colorblindness in his grandsons, if his daughter marries to a normal male?

100%

25%

50%

10%

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