Human Biology

MCQ

Unit 1

1. What is the name of this cell

structure?

A. Golgi body

B. Mitochondrion

C. Lysosome

D. Ribosome

2. Which of the following tissues is rich in both actin and myosin

A. Muscle tissue

B. Liver tissue

C. Nerve tissue

D. Adipose tissue

3. Endocytosis is best described as:

A. The uptake of a substance by a cell by active transport

B. The export of a substance through a cell membrane

C. The uptake of a substance in a vesicle formed by the cell membrane

D. The diffusion of a substance along a concentration gradient

4. The specificity of an enzyme is determined by the

A. Presence of an inhibitor

B. Substrate concentration

C. State of equilibrium of the reaction

D. Molecular structures of substrate and enzyme

5. Which of the following cells secretes antibodies?

A. Bacteria

B. Macrophages

C. T lymphocytes

D. B lymphocytes

6. In a human liver cell the mass of DNA is 6.6 units. A human cell with 3.3 units

of DNA could be:

A. A kidney tubule cell

B. An ovum

C. A mature red blood cell

D. A nerve cell

7. In a human liver cell the mass of DNA is 6.6 units. A human cell with 0 units of

DNA could be

A. A sperm

B. An ovum

C. A mature red blood cell

D. A nerve cell

8. Haploid gametes are produced during meiosis as a result of:

A. The separation of homologous chromosomes

B. The independent assortment of chromosomes

C. The separation of chromosomes into chromatids

D. The crossing over of chromatids

9. Red-green colour blindness is a sex- linked recessive trait. A woman whose father is colour

blind marries a man with normal vision. If they have a daughter what are the chances that

she will be colour blind?

A. 0%B. 25%C. 33%D. 50%

10. Identical twins can result from:

A. Two haploid eggs fertilised by two identical sperm

B. A haploid egg fertilised by two identical sperm

C. A diploid egg fertilised by a single sperm

D. A haploid egg fertilised by a single sperm

11. The cell shown is magnified 300x. What is the actual size of the cell?

A. 6 m

B. 60 m

C. 54 m

D. 540 m

18mm

12. In respiration the sequence of reactions resulting in the conversion of

glucose to pyruvic acid is called:

A. The cytochrome system

B. The TCA cycle

C. The Krebs cycle

D. Glycolysis

13. A DNA molecule could be formed from a molecule of phosphate together

with:

A. Ribose sugar and guanine

B. Ribose sugar and uracil

C. Deoxyribose sugar and guanine

D. Deoxyribose sugar and uracil

14. If a DNA molecule contains 8000 nucleotides of which 20% are adenine, then the number of guanine nucleotides

present is:

A. 1600

B. 2000

C. 2400

D. 3200

15. A section of DNA has the sequence:AATCGCTTC

Identify the 3 anticodons complementary to the mRNA molecule transcribed from

this DNA

A. AAU CGC UUC

B. AAT CGC TTC

C. TTA GCG AAG

D. UUA GCG AAG

16. The cell organelle shown is magnified ten thousand times.

What is its real size?

A. 0.04 m

B. 0.4 m

C. 4 m

D. 40 m

40mm

17. A sperm with a chromosome complement of 23+X fertilises a normal haploid egg. The resulting zygote would:

A. Be female with a chromosome number of 24

B. Be female with a chromosome number of 46

C. Be male with a chromosome number of 46

D. Be female with a chromosome number of 47

18. The cell membrane is chiefly composed of:

A. Carbohydrates and lipids

B. Carbohydrates and proteins

C. Proteins and lipids

D. Carbohydrates and nucleic acids

19.Which of the following must be

present for glycolysis to occur?

A. Glucose and oxygen

B. ATP and oxygen

C. Glucose and ATP

D. ATP and pyruvic acid

20. Glycolysis takes place in the:

A. Nucleus

B. Cristae of the mitochondria

C. Matrix of the mitochondria

D. cytoplasm