Test your Biology - MCQ in life science Answer

1. How do enzymes catalyse reactions? Your Answer: They change the activation energy. Enzymes decrease the activation energy (the energy which is needed to start off the reaction), and also increase the speed of the reaction. 45% of players have answered correctly.

2. Why does water provide a relatively stable external environment for aquatic organisms? Your Answer: Its temperature varies much less than air temperature The other three points are true of water but they do not take a part in providing a stable environment for aquatic animals. 62% of players have answered correctly.

3. CH3CH2COOH is an example of which of these molecules? Your Answer: An alkanoic (fatty) acid Tricarboxylic acids and amino acids share the same carboxyl group but have different functional groups joined to them. An example of a monosaccharide is glucose (C6H12O6). 24% of players have answered correctly.

4. The DNA of a particular cell is damaged so that the cell continues to divide uncontrollably. What is the possible result? Your Answer: Tumour Formation 81% of players have answered correctly.

5. Which of these structures is the smallest? Your Answer: A virus 51% of players have answered correctly.

6. What are enzymes in plant cells made from? Your Answer: Protein Enzymes in plant and animal cells are made from proteins. 45% of players have answered correctly.

7. Compared to a diploid cell, how much genetic material would the nucleus of a haploid cell of the same organism contain? Your Answer: Half An example of a haploid cell is an egg cell (gamete) which only contains half the genetic material of the mother's cells. A diploid cell is just a regular cell. 70% of players have answered correctly.

8. Which of these characteristics are shown by the gene controlling ABO blood groups? Your Answer: Codominance If a person has an Ai gene and a Bi gene, their blood type will be AB. This shows codominance. Codominance is where two differeent alleles both show themselves in the phenotype of a person. Another example would be in the gene for type of hair. There are two alleles: one for curly hair, and one for straight hair. Someone who is heterozygous for these alleles would have wavy hair. 43% of players have answered correctly.

9. Which function is carried out by the Golgi apparatus? Your Answer: Modification of proteins for secretion 44% of players have answered correctly.

10. A woman is heterozygous for a recessive X-linked allele that causes haemophilia. Which statement is correct? Your Answer: She is a carrier of Haemophilia She is a carrier because haemophilia is a recessive trait and she only has one of the recessive alleles. However, in the case of males, one of the recessive alleles would make them a sufferer because it is carried on the X chromosome and males only have one X chromosome. Did you know that there is a line of Haemophilia in the British Royal family? 71% of players have answered correctly.