Free MCQs & Online Quiz Practice for Exams

Q: Cell wall is present in the cells of

A) Fungi only

B) Plants only

C) Plants and prokaryotes only

D) All of the above

Q: Which organelles are covered with a double membrane?

A) Ribosomes

B) Vacuoles

C) Centrioles

D) Mitochondria

Q: All of the following is true for meiosis, EXCEPT

A) There is no DNA synthesis between the divisions

B) The result is four cells with haploid number of chromosomes

C) Meiosis does not contribute to the genetic diversity in populations

D) Fusion of two products of meiosis produces a zygote

Q: If 2n = 8 for a particular cell, then the chromosome number in egg cell after meiosis would be

A) 12

B) 10

C) 8

D) 4

Q: During which stage of meiosis does the chromosome have the least amount of DNA?

A) Prophase-I

B) Prophase-II

C) Telophase-I

D) Telophase-II

Q: Which statement concerning both mitosis and meiosis is correct?

A) Meiosis produces 4 haploid cells while mitosis produces 2 diploid cells

B) Meiosis produces 4 diploid cells while mitosis produces 2 haploid cells

C) Meiosis maintains the number of chromosomes, while mitosis reduces it

D) Prophase-I of mitosis results in the formation of a tetrad but not in prophase-I of meiosis-I

Q: During which phase of meiosis, crossing over occurs?

A) Prophase-I

B) Metaphase-I

C) Metaphase-II

D) Anaphase-I

Q: Which of the following occurs during meiosis-I but not during mitosis?

A) The chromatids of each chromosome are separated

B) Synapsis and crossing over occurs

C) The nuclear envelope breaks down

D) None of these

Q: Meiosis takes place in which of the following organs?

A) Testes

B) Lungs

C) Heart

D) Stomach

Q: Two sister chromatids are collectively called

A) Chromosome

B) Centromere

C) Multichromatid

D) Homologous pair

Q: During the process of regeneration, the type of cell division is

A) Only 1st meiotic division

B) Both meiotic divisions

C) Mitosis

D) All of them

Q: Which of the following statements are true about homologous chromosomes?

A) They are identical

B) They pair up during meiosis

C) One partner of homologous pair moves to each daughter cell

D) All of them

Q: The chemicals which are involved as catalysts inside the living bodies are

A) Carbohydrates

B) Fats

C) Proteins

D) None of these

Q: Enzymes are biological catalysts which

A) Allow new chemical reactions to occur

B) Are used up during chemical reaction

C) Alter the direction of chemical reaction

D) Alter the rate of chemical reactions

Q: What is true about enzymes?

A) All parts of enzyme molecule take part in reaction

B) Enzymes lower the activation energy of reaction

C) An enzyme can act upon any kind of substrates

D) They are needed in large quantities

Q: What is true about cofactors?

A) Take part in reactions

B) Help enzymes in their activity

C) Increase activation energy

D) Are composed of proteins

Q: One of the following may function as coenzymes for the enzymes

A) Proteins

B) Carbohydrates

C) Vitamins

D) DNA

Q: Increase or decrease in temperature beyond the optimum temperature will

A) Increase the rate of reaction

B) Decrease the rate of reaction

C) Not affect the rate of reaction

D) Denature the enzyme

Q: Trypsin, an enzyme, works at

A) Alkaline pH

B) Acidic pH

C) Neutral pH

D) pH does not affect

Q: Change in environmental factors will affect enzyme activity and therefore may affect

A) Metabolism

B) Respiration

C) Digestion

D) All of them