Grade 11 Biology practice questions – Lebanese curriculum

Q: Where do these Grade 11 Biology questions come from?

They are a sample from EduRise's Grade 11 Biology question bank (1,144 questions across 11 chapters), written to follow the Lebanese curriculum. Each chapter on EduRise has its own practice set and a timed exam.

Q: Are the answers explained?

Yes. Every question on EduRise shows the correct answer and an explanation after you answer, in practice mode and in the exam review.

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Question 1

A graft taken from and placed on the same individual is called:

Accepted Answer

an autograft. An autograft carries only self markers: it is accepted.

Question 2

A cell with no nucleus, whose DNA lies free in the cytoplasm, is:

Accepted Answer

a prokaryotic cell. Prokaryotic cells (bacteria) have DNA but no nuclear envelope.

Question 3

The point where the two chromatids of a chromosome are joined is the:

Accepted Answer

centromere. The centromere joins the sister chromatids until anaphase.

Question 4

DNA replication takes place during:

Accepted Answer

the S phase of interphase. S = synthesis of DNA.

Question 5

RNA contains uracil instead of thymine.

Accepted Answer

True. True: U pairs with A.

Question 6

A codon is made of:

Accepted Answer

three bases of the mRNA. Each codon of 3 bases corresponds to an amino acid or to stop.

Question 7

Every substitution of a nucleotide changes an amino acid.

Accepted Answer

False. False: the code is redundant, so a substitution can be silent.

Question 8

A//O and A//A individuals have the same phenotype [A].

Accepted Answer

True. True: A is dominant over O.

Question 9

The labelled precursor used to follow DNA synthesis is:

Accepted Answer

³H-thymidine. Thymidine is found in DNA only.

Question 10

Most amino acids from broken-down proteins are reused.

Accepted Answer

True. True: they return to the pool and are recycled.

Question 11

The RQ of glucose oxidation is:

Accepted Answer

1. C₆H₁₂O₆ + 6 O₂ → 6 CO₂ + 6 H₂O: 6/6 = 1.

Question 12

The RQ of lipid oxidation is about:

Accepted Answer

0.7. Lipids are poor in oxygen: they need more O₂ per CO₂ released.

Question 13

The number of ATP formed per glucose by cellular respiration is about:

Accepted Answer

38. Glycolysis gives 2 ATP and the mitochondrion about 36.

Question 14

Alcoholic fermentation releases CO₂.

Accepted Answer

True. True: 2 CO₂ per glucose; this CO₂ makes bread dough rise.

Question 15

Slow (type I) fibres are rich in mitochondria.

Accepted Answer

True. True: they work aerobically.

Grade 11 Biology Questions and Answers

15 Grade 11 Biology practice questions

1. A graft taken from and placed on the same individual is called:

2. A cell with no nucleus, whose DNA lies free in the cytoplasm, is:

3. The point where the two chromatids of a chromosome are joined is the:

4. DNA replication takes place during:

5. RNA contains uracil instead of thymine.

6. A codon is made of:

7. Every substitution of a nucleotide changes an amino acid.

8. A//O and A//A individuals have the same phenotype [A].

9. The labelled precursor used to follow DNA synthesis is:

10. Most amino acids from broken-down proteins are reused.

11. The RQ of glucose oxidation is:

12. The RQ of lipid oxidation is about:

13. The number of ATP formed per glucose by cellular respiration is about:

14. Alcoholic fermentation releases CO₂.

15. Slow (type I) fibres are rich in mitochondria.

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