1. Enzymes
Flashcards
- What are enzymes?
- Proteins that act as biological catalysts to speed up chemical reactions.
- What is an active site?
- The specific region of an enzyme where the substrate binds.
- What is the lock and key model?
- A model where the substrate fits perfectly into the enzyme's active site.
- What happens when an enzyme is denatured?
- It loses its specific shape and becomes non-functional.
Multiple-choice questions
- What is the primary function of enzymes in biological systems?
- a) To act as structural components of cells
- b) To speed up chemical reactions as catalysts
- c) To provide energy for cellular processes
- d) To store genetic information for organisms
Answer: b) To speed up chemical reactions as catalysts. Enzymes are specialized proteins that function as biological catalysts, meaning they accelerate chemical reactions without being permanently altered or consumed in the process.
- Which term describes the specific region where a substrate binds to an enzyme?
- a) Catalytic site
- b) Binding zone
- c) Active site
- d) Reaction chamber
Answer: c) Active site. The active site is the specific pocket or cleft on an enzyme molecule where the substrate attaches, forming a lock and key structure to facilitate the reaction.
- What is the consequence of exposing an enzyme to extremely high temperatures?
- a) The enzyme works faster
- b) The enzyme is denatured
- c) The enzyme becomes stronger
- d) The enzyme doubles in size
Answer: b) The enzyme is denatured. High temperatures disrupt the protein structure of enzymes, causing them to lose their specific shape, a process known as denaturation, which renders them non-functional.
2. Vitamins and Minerals
Flashcards
- What is the main difference between vitamins and minerals?
- Vitamins are organic substances made by living organisms, whereas minerals are inorganic elements from soil, water, and food.
- Which vitamin supports the immune system and is found in carrots and sweet potatoes?
- Vitamin A
- What is the primary function of Vitamin C?
- It helps heal wounds, produces collagen, and supports the immune system.
- Which mineral deficiency causes anemia?
- Iron deficiency.
Multiple-choice questions
- Which vitamin is primarily responsible for blood clotting and maintaining bone health?
- a) Vitamin A
- b) Vitamin C
- c) Vitamin K
- d) Vitamin E
Answer: c) Vitamin K. Vitamin K is the specific vitamin identified for its role in blood clotting processes and supporting skeletal health.
- What is the primary function of iron in the human body?
- a) Regulating fluid balance
- b) Producing hemoglobin for oxygen transport
- c) Supporting nerve impulses
- d) Acting as an antioxidant
Answer: b) Producing hemoglobin for oxygen transport. Iron is essential for the production of hemoglobin, the protein in red blood cells that carries oxygen throughout the body.
- Which of the following is considered an inorganic element obtained from soil and water?
- a) Vitamin B complex
- b) Mineral
- c) Enzyme
- d) Protein
Answer: b) Mineral. Minerals are defined as inorganic substances derived from the environment, unlike vitamins which are organic and produced by living organisms.
3. Digestive System
Flashcards
- What is the path of food through the digestive system?
- Mouth, esophagus, stomach, small intestine, large intestine, rectum, anus.
- Define mechanical digestion.
- The physical breakdown of food, such as chewing or churning.
- Define chemical digestion.
- The breakdown of food using enzymes and digestive juices.
- Where does most nutrient absorption occur?
- In the small intestine.
Multiple-choice questions
- What is the primary function of mechanical digestion?
- a) Breaking down food into smaller chemical molecules using enzymes.
- b) Physical breakdown of food into smaller pieces.
- c) Absorbing nutrients into the bloodstream.
- d) Eliminating waste from the body.
Answer: b) Physical breakdown of food into smaller pieces.. Mechanical digestion is defined as the physical process of breaking down food into smaller pieces, such as chewing, whereas chemical digestion involves enzymes.
- Which organ is responsible for the majority of nutrient absorption?
- a) Stomach
- b) Large intestine
- c) Small intestine
- d) Esophagus
Answer: c) Small intestine. The small intestine contains villi and microvilli that significantly increase the surface area, allowing for efficient nutrient absorption into the bloodstream.
- What is the main role of the large intestine in the digestive process?
- a) Digesting proteins using pepsin.
- b) Absorbing water and minerals.
- c) Producing bile for fat digestion.
- d) Breaking down starch into sugars.
Answer: b) Absorbing water and minerals.. The large intestine is primarily responsible for absorbing water and minerals from the remaining food material and forming solid waste.
4. Teeth, Stomach, Small Intestine and Large Intestine
Flashcards
- What is the primary function of incisors?
- To cut food.
- What is the primary function of canines?
- To tear food.
- What do premolars and molars do?
- They crush and grind food.
- What is produced in the stomach to digest proteins?
- Pepsin.
Multiple-choice questions
- Which type of teeth is primarily responsible for cutting food?
- a) Canines
- b) Incisors
- c) Premolars
- d) Molars
Answer: b) Incisors. Incisors are specifically adapted for cutting food during the initial stage of mechanical digestion.
- What is the primary function of hydrochloric acid in the stomach?
- a) To emulsify fats
- b) To absorb water
- c) To kill harmful bacteria
- d) To produce bile
Answer: c) To kill harmful bacteria. Hydrochloric acid (HCl) creates an acidic environment in the stomach that helps kill harmful bacteria ingested with food.
- Which organ is responsible for completing digestion and absorbing nutrients?
- a) Stomach
- b) Large Intestine
- c) Small Intestine
- d) Liver
Answer: c) Small Intestine. The small intestine is the main site where digestion is completed and nutrients are absorbed into the bloodstream.
5. Liver and Pancreas
Flashcards
- What is the primary function of the liver regarding digestion?
- The production of bile.
- Where is bile stored?
- In the gallbladder.
- What does bile do to fats?
- It emulsifies them, making them easier to digest.
- What are the two hormones produced by the pancreas to regulate blood sugar?
- Insulin and glucagon.
Multiple-choice questions
- Which organ is responsible for producing bile?
- a) Pancreas
- b) Stomach
- c) Liver
- d) Gallbladder
Answer: c) Liver. The liver is the organ that produces bile, which is then stored in the gallbladder and released into the small intestine to emulsify fats.
- What is the primary function of bile?
- a) To digest proteins
- b) To emulsify fats
- c) To regulate insulin
- d) To store glycogen
Answer: b) To emulsify fats. Bile emulsifies fats, which breaks down large fat globules into smaller droplets, making them easier for lipase to digest.
- Which enzyme produced by the pancreas is responsible for digesting proteins?
- a) Pancreatic amylase
- b) Pancreatic lipase
- c) Trypsin
- d) Insulin
Answer: c) Trypsin. Trypsin is the specific enzyme produced by the pancreas that breaks down proteins into smaller peptides.
6. Macromolecules
Flashcards
- What is the primary function of proteins?
- To build and repair tissues, make enzymes and hormones, support the immune system, and help muscles grow.
- What are the main food sources of proteins?
- Meat, fish, eggs, beans, dairy products, and nuts.
- Into what are proteins broken down during digestion?
- Amino acids.
- Which two main enzymes digest proteins?
- Pepsin and trypsin.
Multiple-choice questions
- What is the primary function of proteins in the human body?
- a) Providing the main source of energy
- b) Building and repairing body tissues
- c) Storing vitamins and minerals
- d) Regulating blood sugar levels
Answer: b) Building and repairing body tissues. Proteins are essential for building and repairing tissues, creating enzymes and hormones, and supporting muscle growth and the immune system.
- Which of the following is a primary food source for carbohydrates?
- a) Meat
- b) Eggs
- c) Pasta
- d) Fish
Answer: c) Pasta. Pasta is a starchy food rich in carbohydrates, which serve as the body's main source of energy.
- Into what substance are carbohydrates broken down during digestion?
- a) Amino acids
- b) Simple sugars
- c) Fatty acids
- d) Peptides
Answer: b) Simple sugars. Carbohydrates are chemically broken down by enzymes like amylase into simple sugars, primarily glucose, to be used as fuel.
And 36 more flashcards and 24 more questions in the document.
Document text
SCIENCE UNIT REVIEW 1. Enzymes What are enzymes? Enzymes are proteins that act as biological catalysts. They speed up chemical reactions in the body without being used up or changed. How do enzymes work? Each enzyme has a specific active site. A substrate fits into the active site like a lock and key. The enzyme changes the substrate into products. The enzyme is released unchanged and can be used again. Factors that affect enzyme activity Temperature: Enzymes work best at their optimum temperature (around 37°C in humans). High temperatures can denature enzymes. pH: Every enzyme has an optimum pH. Very acidic or basic conditions can denature enzymes.
Substrate concentration: More substrate increases the reaction rate until all enzymes are occupied. Enzyme concentration: More enzymes increase the reaction rate if enough substrate is available. Examples of digestive enzymes Amylase: Breaks down starch into sugars. Pepsin: Breaks down proteins into peptides. Trypsin: Continues protein digestion in the small intestine. Lipase: Breaks down fats into fatty acids and glycerol. 2. Vitamins and Minerals Difference between vitamins and minerals Vitamins Organic substances made by living organisms. Needed in small amounts. Help regulate body processes. Minerals Inorganic elements from soil, water, and food.
Build body structures and regulate body functions. Main vitamins Vitamin A Keeps eyes and skin healthy. Supports the immune system. Found in carrots, sweet potatoes, liver, spinach. Vitamin B Complex Helps release energy from food. Supports the nervous system. Found in meat, eggs, dairy, whole grains. Vitamin C Helps heal wounds. Produces collagen. Supports the immune system. Found in oranges, strawberries, kiwi, peppers. Vitamin D Helps absorb calcium. Keeps bones and teeth strong. Obtained from sunlight, fish, eggs, milk. Vitamin E Protects cells from damage. Acts as an antioxidant. Found in nuts, seeds, vegetable oils. Vitamin K Helps blood clot. Keeps bones healthy.
Found in green leafy vegetables. Important minerals Calcium Strong bones and teeth. Muscle contraction. Blood clotting. Iron Makes hemoglobin. Carries oxygen in the blood. Deficiency: anemia. Phosphorus Strong bones and teeth. Helps produce energy (ATP). Potassium Muscle contraction. Nerve function. Maintains fluid balance. Sodium Fluid balance. Nerve impulses. Muscle function. Magnesium Muscle and nerve function. Helps enzymes work. Bone health. 3. Digestive System Path of food 1. Mouth 2. Esophagus 3. Stomach 4. Small intestine 5. Large intestine 6. Rectum 7. Anus Mechanical digestion Physical breakdown of food. Examples: Chewing by teeth. Churning in the stomach.
Chemical digestion Breakdown of food using enzymes and digestive juices. Examples: Saliva contains amylase. Stomach acid and pepsin digest proteins. Pancreatic enzymes digest carbohydrates, proteins, and fats. Nutrient absorption Occurs mainly in the small intestine. Villi and microvilli increase the surface area. Nutrients enter the bloodstream. Waste elimination Water is absorbed in the large intestine. Solid waste forms feces. Feces are stored in the rectum. Waste leaves through the anus. 4. Teeth, Stomach, Small Intestine and Large Intestine Teeth Functions: Cut food (incisors). Tear food (canines). Crush and grind food (premolars and molars). Begin mechanical digestion.
Stomach Functions: Stores food. Mixes food with gastric juice. Produces hydrochloric acid (HCl). Produces pepsin to digest proteins. Kills harmful bacteria. Small Intestine Functions: Completes digestion. Absorbs nutrients. Receives bile from the liver. Receives enzymes from the pancreas. Contains villi for absorption. Large Intestine Functions: Absorbs water and minerals. Houses beneficial bacteria. Forms feces. Stores waste before elimination. 5. Liver and Pancreas Liver Functions: Produces bile. Removes toxins. Stores glycogen. Stores vitamins and minerals. Processes nutrients. Bile production Produced by the liver. Stored in the gallbladder. Released into the small intestine.
Emulsifies fats, making them easier for lipase to digest. Pancreas Functions: Produces digestive enzymes. Produces insulin and glucagon. Helps regulate blood sugar. Pancreatic enzymes Pancreatic amylase: Digests carbohydrates. Trypsin: Digests proteins. Pancreatic lipase: Digests fats. 6. Macromolecules Proteins Function Build and repair tissues. Make enzymes and hormones. Support the immune system. Help muscles grow. Food sources Meat Fish Eggs Beans Dairy products Nuts Digestion Proteins Amino acids Main enzymes: Pepsin Trypsin Carbohydrates Function Main source of energy. Fuel for the brain and muscles.
Food sources Bread Rice Pasta Potatoes Fruits Cereals Digestion Carbohydrates Simple sugars (mainly glucose) Main enzyme: Amylase