Question:- Those reflex actions which involve brain are called: A. Stimulus B. Cerebral reflexes C. Spinal reflexes D. Reflex arc
Answer:- Ans. B Explanation: Those reflex actions which involve brain are called cerebral reflexes. They occur in the organs present in the head because these organs are directly connected to the brain.
Question:- Pons, cerebellum and medulla are part of which brain? A. Forebrain B. Midbrain C. Hindbrain D. None of the above
Answer:- Ans. C Explanation: The brain is broadly divided into three regions: forebrain, midbrain and hindbrain. The forebrain mainly consists of cerebrum. The midbrain does not have any further divisions. The hindbrain consists of three centres called pons, cerebellum and medulla.
Question:- Spinal Cord originates from which part of the brain? A. Cerebellum B. Medulla C. Pons D. Cerebrum
Answer:- Ans. B Explanation: From Medulla Spinal cord originates. Medulla controls various involuntary actions such as heart beat, breathing, blood pressure and peristaltic movements of alimentary canal. Medulla is also the controlling centre for reflexes such as swallowing, coughing, sneezing, secretion of saliva and vomiting.
Question:- Which of the following statement is/are correct about Enzyme: A. An Enzyme is a protein and is used as a catalyst to accelerate the reaction. B. Life would not exist without the presence of enzymes. C. Enzymes participate in cellular metabolic processes. D. All the above
Answer:- Ans. D Explanation: Enzymes are proteins that act as catalysts within the living cells. They are composed of one or more long chains of interconnected amino acids. They accelerate chemical reactions. All chemical reactions that occur in living organism are dependent on catalytic actions of enzymes and therefore, known as Bio transformation. Life would not exist without the presence of enzymes.
Question:- Which enzyme is used in making Baby Foods? A. Amylase B. Rennin C. Trypsin D. None of the above
Answer:- Ans. C Explanation: Trypsin enzyme is used in making Baby Foods.
Question:- Name an enzyme that is derived from the stomachs of young ruminant animals and also used in dairy industry to produce cheese? A. Trypsin B. Pepsin C. Liginase D. Rennin
Answer:- AnS: D Explanation: Rennin enzyme is derived from the stomachs of young ruminant animals like calves and lambs which are used in the dairy industry to produce Cheese.
Question:- Name an enzyme that digests fat? A. Lipase B. Sucrase C. Maltase D. Fructose
Answer:- Ans. A Explanation: Fats are lipids and one of the three major food groups needed for proper nutrition. The digestive enzyme lipase is required to digest fat. It hydrolyzes lipids, the ester bonds in triglycerides to form fatty acids and glycerol.
Question:- Who coined the word enzyme? A. Wilhelm Kuhne B. Alfred Russel C. Robert Koch D. Rosalind Franklin
Answer:- Ans. A Explanation: Enzyme is a protein manufactured by a cell and is a catalyst in various biological functions. In the late 1800’s the term enzyme was coined by a German physiologist Wilhelm Kunhe. He used the term “enzym” to describe the unorganised ferment from yeast and other organisms. Further, the word was later given to the actual agents discovered to spark the reactions, taken from the Greek enzymos, which meant "leavened." (Leavening makes bread rise).
Question:- Name an enzyme which is not proteinaceous in nature? A. Cellulases B. Xylanases C. Ribozyme D. Peptidiase
Answer:- Ans. C Explanation: All enzymes are protein in nature except Ribozymes, which are rRNA.
Question:- Which enzyme is used by the biscuit manufacturers to lower the protein level of flour? A. Amylase B. Protease C. Cellulase D. Xylanase
Answer:- Ans. B Explanation: Protease enzyme is used by the biscuit manufacturers to lower the protein level of flour.
Question:- Inactive enzymes which are not bound to their cofactors are called A. Apoenzymes B. Coenzymes C. Enzyme inhibitors D. Holoenzymes
Answer:- Ans. A Explanation: Inactive enzymes which are not bound to their cofactors are called Apoenzymes. And active enzymes bound to their cofactors are called holoenzymes.
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.