1- Which of the following is a physical basis of life?
A. Nucleus
B. Protoplasm
C. Ribosome
D. Mitochondria
View Answer
Answer : B. Protoplasm
Description
2- A plasmid is:
A. A component of the cell wall
B. A part of the plasma membrane
C. A vesicle full of digestive enzymes
D. An extra-chromosomal genetic element
View Answer
Answer : D. An extra-chromosomal genetic element
Description
3- Oncogenes are:
A. Genes inhibiting cell division
B. Ancestral genes
C. Tumor inducing genes
D. Genes present in prokaryotic cells
View Answer
Answer : C. Tumor inducing genes
Description
4- Cork cells are impervious to water because of the presence of:
A. Suberin
B. Cutin
C. Lignin
D. Cellulose
View Answer
Answer : A. Suberin
Description
5- The chemical symbol for Gold is:
A. Au
B. Ag
C. Fe
D. Pb
View Answer
Answer : A. Au
Description
6- A mature mammalian cell without nucleus is:
A. Erythrocyte
B. Lymphoblast
C. Spermatozoa
D. Trophoblast
View Answer
Answer : A. Erythrocyte
Description
7- DNA molecule is a unique biological entity because it:
A. Forms a strand
B. Forms a loop
C. Is self-replicating
D. Contains nucleotides
View Answer
Answer : C. Is self-replicating
Description
8- Which of the following cell organelles are known as the suicidal bags, since they liberate such enzymes that can cause breakdown of the cell?
A. Ribosomes
B. Phagocytes
C. Lysosomes
D. Dictyosome
View Answer
Answer : C. Lysosomes
Description
9- The scientist who first recognized and named the nucleus was:
A. Robert Brown
B. Robert Hooke
C. Theodore Schwann
D. Thomas Morgan
View Answer
Answer : A. Robert Brown
Description
10- Chromosomes are:
A. Visible in all cells at every time
B. Present only in the nucleus of a cell
C. The biggest in number in human cells
D. Made up of DNA as a main component
View Answer
Answer : D. Made up of DNA as a main component
Description
11- Which of the following organelles is present in bacteria or prokaryotic cell?
A. Vacuoles
B. Mitochondria
C. Ribosomes
D. Golgi bodies
View Answer
Answer : C. Ribosomes
Description
12- When a cell neither shrinks nor swells when kept in a fluid, then the fluid in the cell in relation to ambient fluid is called:
A. Isotonic
B. Hyalotonic
C. Hypotonic
D. Hypertonic
View Answer
Answer : A. Isotonic
Description
13- Which of the following organic compounds constitute about 45% of the dry protoplasm of a cell?
A. Fats
B. Proteins
C. Enzymes
D. Carbohydrates
View Answer
Answer : B. Proteins
Description
14- In which one of the following types of cell divisions does crossing over of chromosomes take place?
A. Amitosis
B. Mitosis
C. Meiosis
D. Cytokinesis
View Answer
Answer : C. Meiosis
Description
15- Energy transfers of Krebs cycle and electron transport chain take place in:
A. Lysosomes
B. Chloroplasts
C. Cytoplasm
D. Mitochondria
View Answer
Answer : D. Mitochondria
Description
16- Kilowatt-hour is a unit of:
A. Time
B. Power
C. Electric current
D. Energy
View Answer
Answer : D. Energy
Description
17- A scientist was treating pathogenic bacteria with different chemicals to see which of them would stop the activity of their ribosomes. Which one of the following processes is the target?
A. DNA synthesis
B. Digestion of proteins
C. Protein synthesis
D. Production of ATP
View Answer
Answer : C. Protein synthesis
Description
18- Which of the following pigments is water soluble?
A. Carotene
B. Chlorophyll
C. Xanthophyll
D. Anthocyanin
View Answer
Answer : D. Anthocyanin
Description
19- An organelle involved in the transformation and turnover of membranes within a cell is:
A. Golgi bodies
B. Plasma membrane
C. Nucleus
D. Endoplasmic reticulum
View Answer
Answer : A. Golgi bodies
Description
20- A molecule of glucose on complete oxidation yields _____ ATP molecules in case of aerobic respiration.
