Sindh MDCAT 2019 Paper

21- Why some vegetables lose water when salt is applied to them ?

A. Due to less negative water potential of external environment than the cell
B. Due to more negative water potential of external environment than the cell
C. Due to less positive water potential of external environment than the cell
D. Due to more positive water potential of external environment than the cell  

Answer : B. Due to more negative water potential of external environment than the cell

22- What type of protein is present in eukaryotic DNA but NOT in prokaryotic DNA?

A. Receptor protein  
B. Glycoprotein
C. Chromatid protein
D. Histone protein

Answer : D. Histone protein

23- Whenever a muscle contracts, a sarcomere can be shorten up to ______% of its total length.

A. 15
B. 25
C. 35
D. 45

Answer : C. 35

24- The second stage of the Prophase of Meiosis, following Leptotene, during which homologous chromosomes begin to pair is called:

A. Anaphase
B. Zygotene
C. Diplotene
D. Pachytene

Answer : B. Zygotene

25- Formation of ______ will be greater with the faster break down of glucose and glycogen to compensate energy requirements in anaerobic respiration.

A. Fat
B. Enzymes
C. Hormones
D. Lactic acid

Answer : D. Lactic acid

26- A strand, almost ______ nucleotides long is wrapped around a core of ______ histone proteins to form a structure called a Nucleosome.

A. 200-4
B. 200-8
C. 200-16
D. 2000-4

Answer : B. 200-8

27- A group of biologically active molecules formed from amino acids which interact with the surface of the lipid bilayer of cell membranes are called ______.

A. Integral Proteins  
B. Peripheral proteins
C. Cell wall 
D. Plasmodesmata

Answer : B. Peripheral proteins

28- Transport of three protons through the ATPase complex are required for the production of one ______.

A. Sugar molecule  
B. NADP molecule  
C. ATP molecule
D. NADPH molecule 

Answer : C. ATP molecule

29- Which one of the following options is NOT an example of genetic engineering?

A. Insulin producing bacteria  
B. Oil eating bacteria
C. Photosynthetic bacteria
D. Metal extracting bacteria  

Answer : C. Photosynthetic bacteria

30- In a forest there are a lot of plants, trees, shrubs and herbs. What will the Palm trees face if they grow in the same forest?

A. Intra specific competition
B. Inter specific competition
C. Environmental competition
D. All of the above

Answer : D. All of the above

32- While working in a laboratory, before studying sample under microscope, it was immersed in a dye solution to obtain ______.

A. Magnification
B. Image
C. Match
D. Contrast

Answer : D. Contrast

34- A is an organism that makes ATP by aerobic respiration if oxygen is present, but is capable of switching to fermentation, if oxygen is absent.

A. Cellular anaerobe
B. Respiratory anaerobe  
C. Obligate anaerobe  
D. Facultative anaerobe

Answer : D. Facultative anaerobe

35- Choose the best group from the following to produce transgenic plants in the laboratory:

A. Group a
B. Group b
C. Group b & c 
D. Group c 

Answer : A. Group a

36- Which one of the following is NOT a mode of transmission of AIDS?

A. Through unsterilized needles  
B. Through contact with open wounds
C. Through blood transfusion
D. Through holding hands

Answer : D. Through holding hands

38- An enzyme called is responsible for copying a DNA sequence into an RNA sequence.

A. Restriction enzyme
B. Reverse transcriptase
C. RNA polymerase
D. DNA polymerase  

Answer : C. RNA polymerase

40- When plant cell receives a signal for death, it commits suicide by rupturing:

A. Nucleus
B. Cell membrane
C. Tonoplast
D. Chloroplast

Answer : C. Tonoplast

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