AC-HPAT Biology quiz well explained 2024.

Pancreas and Type 1 diabetes - answersThe pancreas is the organ that produces insulin, and it plays a major role in regulating blood glucose levels. Type 1 diabetes occurs when the pancreas does not make enough or any insulin. How does insulin work in diabetes? - answersInsulin pumps are small, computerized devices that mimic the way the human pancreas works by delivering small doses of short acting insulin continuously (basal rate). The device also is used to deliver variable amounts of insulin when a meal is eaten (bolus) chemotherapy - answersChemotherapy is a drug treatment that uses powerful chemicals to kill fast-growing cells in your body. Chemotherapy is most often used to treat cancer, since cancer cells grow and multiply much more quickly than most cells in the body. It targets cells that grow and divide quickly, as cancer cells do. Unlike radiation or surgery, which target specific areas, chemo can work throughout your body. But it can also affect some fast-growing healthy cells, like those of the skin, hair, intestines, and bone marrow. How can stem cells be used in the treatment of leukemia? And how effective is it? - answersStem cell transplant replaces the leukemia cells in your bone marrow with new ones that make blood. Your doctor can get the new stem cells from your own body or from a donor. Stem cell transplantation is effective against leukemia. In many cases, however, the transferred immune cells of the donor also attack the recipients' healthy tissue—often with fatal consequences. ... Stem cell therapy offers people suffering from leukemia or bone-marrow cancer the chance of full recovery. Why is laser technology more effective than conventional surgery in removing cancerous tumours? - answersLasers are more precise than standard surgical tools (scalpels), so they do less damage to normal tissues. As a result, patients usually have less pain, bleeding, swelling, and scarring. With laser therapy, operations are usually shorter. Urinary system - answers· The urinary system, also known as the renal system or urinary tract, consists of the kidneys, ureters, bladder, and the urethra. The purpose of the urinary system is to eliminate waste from the body, regulate blood volume and blood pressure, control levels of electrolytes and metabolites, and regulate blood pH Nanotechnology - answersNanotechnology can provide rapid and sensitive detection of cancer-related molecules, enabling scientists to detect molecular changes even when they occur only in a small percentage of cells. Mercury poisoning - answersThe most common cause of mercury poisoning is from consuming too much methyl mercury or organic mercury, which is linked to eating seafood. Small amounts of mercury are present in everyday foods and products, which may not affect your health. Too much mercury, however, can be poisonous. Mercury salts affect primarily the gastrointestinal tract and the kidneys, and can cause severe kidney damage; however, as they cannot cross the blood-brain barrier easily, these salts inflict little neurological damage without continuous or heavy exposure. How can ultraviolet light from the sun affect the cells of the human eye? - answersUV rays may lead to macular degeneration, a leading cause of vision loss for older Americans. UV rays, especially UV-B rays, may also cause some kinds of cataracts. A cataract is a clouding of the eye's natural lens, the part of the eye that focuses the light we see. Macromolecules - answersMacromolecules are large molecules composed of thousands of covalently connected atoms. Carbohydrates, lipids, proteins, and nucleic acids are all macromolecules. Macromolecules are formed by many monomers linking together, forming a polymer. passive transport - answersPassive transport is a movement of ions and other atomic or molecular substances across cell membranes without need of energy input. Unlike active transport, it does not require an input of cellular energy because it is instead driven by the tendency of the system to grow in entropy. active transport - answersactive transport is the movement of molecules across a membrane from a region of lower concentration to a region of higher concentration—against the concentration gradient. Active transport requires cellular energy to achieve this movement. catalyst - answersCatalyst: a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change. fluid mosaic model - answersdescribes the structure of the plasma membrane as a mosaic of components —including phospholipids, cholesterol, proteins, and carbohydrates—that gives the membrane a fluid character. The proportions of proteins, lipids, and carbohydrates in the plasma membrane vary with cell type Effect of lead on nerve cells - answersLead poisoning can cause peripheral nerve damage: this can cause muscle weakness and problems with the sense of touch. When researchers examine these damaged nerves, they find that the myelin insulation is often gone, and the axons are destroyed. These changes prevent nerves from transmitting messages properly. the effect of electromagnetic radiation on brain - answersReported symptoms include headaches, anxiety, suicide and depression, nausea, fatigue and loss of libido. To date, scientific evidence does not support a link between these symptoms and exposure to electromagnetic fields. Carbohydrates function - answersCarbohydrates are the most abundant biomolecule on Earth. Living organisms use carbohydrates as accessible energy to fuel cellular reactions and for structural support inside cell walls. Cells attach carbohydrate molecules to proteins and lipids, modifying structures to enhance functionality. Proteins function - answersProteins fold up into specific shapes according to the sequence of amino acids in the polymer, and the protein function is directly related to the resulting 3D structure. Proteins may also interact with each other or other macromolecules in the body to create complex assemblies. Enzymes function - answersEnzymes are the catalysts involved in biological chemical reactions. They are the "gnomes" inside each one of us that take molecules like nucleotides and align them together to create DNA, or amino acids to make proteins, to name two of thousands of such functions. Function of lipids - answersThey include fats, waxes, oils, hormones, and certain components of membranes and function as energy-storage molecules and chemical messengers. Together with proteins and carbohydrates, lipids are one of the principal structural components of living cells Lysosomes - answersOne of the key organelles involved in digestion and waste removal is the lysosome. Lysosomes are organelles that contain digestive enzymes. They digest excess or worn out organelles, food particles, and engulfed viruses or bacteria. Vacuole - answers· Vacuoles are membrane-bound sacs within the cytoplasm of a cell that function in several different ways. In mature plant cells, vacuoles tend to be very large and are extremely important in providing structural support, as well as serving functions such as storage, waste disposal, protection, and growth.