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Home /
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MDCAT Past Papers /
IBA /
Biology /
Chap No 14 /
2025 /
Quiz 1

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MDCAT Past Papers - IBA - Biology - Chap No 14 - 2025 Quiz

Attempt 10 MCQs on MDCAT Past Papers - IBA - Biology - Chap No 14 (Year 2025) | Quiz 1

1. Role of mRNA in COVID-19 vaccines like Pfizer and Moderna is to:

Helps the immune system recognize the virus
Instructs cells to produce the viral spike protein
Triggers immediate antibody release from memory cells
Delivers enzymes that destroy the virus

2. Name the biomolecule essential for information storage and transmission within cells.

Carbohydrates
Lipids
Nucleic acids
Proteins

3. What is the chemical composition of chromosomes?

RNA and lipids
DNA and proteins
Carbohydrates and nucleic acids
Proteins and carbohydrates

4. Guanine - cytosine pairs enhance DNA stability due to:

Larger size
Closer pairing
More hydrogen bonds
Double ring structure in both

5. If a male with hemophilia marries a non-carrier female, what is the likelihood of their sons inheriting the condition?

50%
100%
0%
25%

6. If the disease is caused due to a defective gene located on the X chromosome, then defectives gene can only be transmitted to male offspring by the:

Female gamete
Male gamete
Bacteria
Mutation

7. If a round seeded pea plant is self-fertilized and all of its offspring are also round seeded:

Both parents and offspring must be true breed
Both parents and offspring may be true breed
Only parents but not offspring will be true breed
Only offspring but not parents will be true breed

8. If "RRYY" is crossed with "rryy", what will be the ratio of "RRYY" to "rryy" in F2 generation?

9:3:3:1
3:1
1:3
1:1

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Instructions: Select one answer per question. After submitting, you will see your score, correct answers, and explanations.

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