Question:- In humans salivary amylase enzyme breaks down starch. The optimum pH for this reaction is: A. 6 B. 6.2 C. 6.4 D. 6.7
Answer:- Ans. D Explanation: Salivary amylase breaks down starch in humans at optimum pH of 6.7.
Question:- The lock and key hypothesis mechanism is related with: A. Digestion of fat in the body B. For enzyme specificity C. For the formation of vacuole D. Explosives
Answer:- Ans. B Explanation: The mechanism by which an enzyme binds with the substrate to forward the reaction of producing products can be explained by Lock and key hypothesis and Induced fit mechanism. It is very specific inter molecular interactions, “lock and key,” in biochemistry. Examples include enzyme-protein, antigen-antibody, and hormone-receptor binding.
Question:- Who discovered cell in 1665? a) Robert Hook b) Robert Crook c) David Thomson d) Marie Francois
Answer:- Ans. a) Explanation: In 1665, the cell was first discovered by Robert Hooke. The cell has a rich and interesting history that has ultimately provided the way to various scientific advancements of today.
Question:- Name an Organelle which serves as a primary packaging area for molecules that will be distributed throughout the cell? a) Mitochondria b) Plastids c) Golgi apparatus d) Vacuole
Answer:- Ans. c) Explanation: Golgi apparatus is also known as Golgi complex or Golgi body. It is an organelle that serves as a primary packaging area for molecules that will be distributed throughout the cell. It is located in the cytoplasm next to the endoplasmic reticulum and near the nucleus of the cell.
Question:- Name the outermost boundary of the cell? a) Plasma membrane b) Cytoplasm c) Nuclear membrane d) None of the above
Answer:- Ans. a) Explanation: Plasma Membrane is the outermost boundary of the cell. It is also known as the cell membrane. It is the membrane found in all cells that separate the interior of the cell from the outside environment. A cell wall is attached to the plasma membrane on its outside surface in bacterial and plant cells.
Question:- Name the process in which the ingestion of material by the cells is done through the plasma membrane? a) Egestion b) Diffusion c) Osmosis d) Endocytosis
Answer:- Ans. d) Explanation: Endocytosis is the process in which the ingestion of material by the cells is done through the plasma membrane. Or we can say that it is the process of actively transporting molecules into the cell by engulfing it with its membrane.
Question:- Which among the following sentence is not correct about the organelles? a) They are found in all Eukaryotic cells. b) They are found in multicellular organisms. c) They coordinate to produce the cell. d) They are small sized and mostly internal.
Answer:- Which among the following sentence is not correct about the organelles? a) They are found in all Eukaryotic cells. b) They are found in multicellular organisms. c) They coordinate to produce the cell. d) They are small sized and mostly internal.
Question:- Name the process in which the passage of water goes from a region of higher concentration to a region of lower concentration through a semi permeable membrane? a) Diffusion b) Osmosis c) Both a) and b) d) Neither a) nor b)
Answer:- Ans. b) Explanation: Osmosis is the process in which the passage of water goes from a region of higher concentration to a region of lower concentration through a semi-permeable membrane.
Question:- Name an organism that contains a single chromosome and cell division occurs through fission or budding? a) Eukaryotes b) Prokaryotes c) Bacteria d) Primitive organism
Answer:- Ans. b) Explanation: Prokaryotes contain a single chromosome and cell division occurs through fission or budding. The usual method of prokaryote cell division is termed binary fission. The prokaryotic chromosome is a single DNA molecule that first replicates, then attaches each copy to a different part of the cell membrane.
Question:- Name the process in which the membrane of a vesicle can fuse with the plasma membrane and extrude its contents to the surrounding medium? a) Exocytosis b) Endocytosis c) Osmosis d) Diffusion
Answer:- Ans. a) Explanation: Exocytosis is the process in which the membrane of a vesicle can fuse with the plasma membrane and extrude its contents to the surrounding medium.
Question:- The jelly-like substance present inside the cell is known as: a) Cytoplasm b) Ectoplasm c) Nucleoplasm d) None of the above
Answer:- Ans. a) Explanation: Cytoplasm is the jelly-like substance present inside the cell and contains other organelles. It is a thick solution that fills each cell and is enclosed by the cell membrane.
Question:- Blue-green Algae are: a) Prokaryotes b) Eukaryotes c) Both a) and b) d) Neither a) nor b)
Answer:- Ans. a) Explanation: Blue-green Algae or Cyanobacteria are Prokaryotes. They lack membrane-bound organelles and nuclei.
Question:- Which disease of plant is known as ring disease? A. Citrus Canker B. Black arm of cotton C. Wilt of Potato D. None of the above
Answer:- Ans. C Explanation: Wilt of Potato is a disease of plant caused by the bacteria. It is also known as ring disease because brown ring is formed on the xylem.
Question:- Name the disease of plant in which large yellow spot appears on the leaves? A. Bacterial Blight B. Bacterial Spot C. Aphids D. Botrytis
Answer:- Ans. A Explanation: In Bacterial Blight disease of plant large yellow spots appear on leaves that eventually turn brown.