| | | A) | endoplastic reticulum | | | B) | microtubules | | | C) | cytoplasm | | | D) | mitochondria | | | | | | Feedback: The cell's chemical processes take place in a semifluid material called the cytoplasm. This material provides an ideal environment for organelles because of its fluidity. | | 7 CORRECT | | This shows an example of endoplasmic reticulum. What is the significance of its structure? | | | A) | provides a location for DNA production | | | B) | helps decrease surface area | | | C) | allows selective permeability of cell membrane | | | D) | facilitates breakdown of chemical bonds | | | | | | Feedback: The pleats and folds of the endoplasmic reticulum provides a large surface area where cellular functions, such as breaking chemical bonds, can take place.
In plants the most important cells in which play a part in the intake of substances, are the root hair cells. Their job is to supply the plant with water and nutrients from the soil and transport them to all of the plant as it is needed. These cells use active transport in order to intake minerals, such as potassium,
3. The role of the sarcoplasmic reticulum releases calcium ions that will cause the troponin/ tropomyosin complex to move. This will expose the binding sites on actin so that the cross-bridges of myosin can bind to it. *High calcium concentrations = concentration occurs (bind to troponin – moves tropomyosin out of the way to reveal the hidden receptor site) *Low calcium concentrations = concentration does not occur (troponin goes back – move the tropomyosin back in the way of the myosin = blocks). (Calcium ions) are stored in the Sarcoplasmic reticulum.
1) Genetic engineering or genetic modification is the process of altering an organism’s genetic material for a beneficial purpose. Genetic modification is used to improve the products we obtain from plants and animals making them more nutritious, less-harmful manufacturing processes, and production in large quantities making them less expensive. 2) Gene Therapy- when an absent or faulty gene is replaced by a normal gene in order to treat a disorder or medical disease Plasmid- small circular DNA molecules in the cytoplasm of bacteria, these molecules cut DNA into a recognizable sequences DNA Polymerase Chain (PCR)- technique used to make copies of a certain gene. Biologists particularly use this with tiny genes that are rarely available. Hybridization- crossing different traits to bring the best of organisms into one.
The level of osmotic pressure is equal in the intracellular fluid, and the extracellular fluid.’ (Study.com, 2015) ‘Osmotic pressure is vital within the human body because it allows water to enter a cell if there is lack of water, and vice versa, if there is too much water within one cell, the osmotic pressure will allows the electrolytes to exit a cell.’ (Study.com, 2015) ‘Intracellular fluid has important functions, it transports food within the cells, it also brings waste products from the cells so that they can be picked up and excreted from the body, and it maintains the shape and size of the cell.’ (Nursing411.org, 2015) ‘Extracellular fluid is located outside the body cells. The extracellular fluid consists of one-third of the water contained in the body. The extracellular fluid has many functions; it carries nutrients and oxygen to the body cells and waste materials from the cells. There are two types of extracellular fluid, including interstitial fluid and intravascular fluid.’
The myosin head stays bound until a new ATP molecule binds to it. The next ATP causes the head to be released from the actin, which results in another power stroke. The stimulus stops. Ach is diffused through the synaptic cleft, CA2+ is transported back into the sarcoplasmic reticulum, and tropomyosin shifts to conceal the myosin binding sites. The sarcomeres slide back to their initial
This is called positive thigmotropism. Negative thigmotropism occurs in the roots of plants, allowing the roots to follow the line of least resistance through the soil. Touched cells produce auxin and transport it to untouched cells. Some untouched cells will then elongate faster so cell growth bends around the object. Redvine tendrils coil upon contact.
For insertion of sperm (in semen) with the female to produce offspring, so continues the cycle of human life. * Prostate- The function of the prostate gland is to secrete proteins and hormones that are added to the ejaculatory fluid produced by the seminal
Discuss the importance of teeth in human nutrition Teeth perform mechanical digestion thus increasing the surface area of food for salivary amylase to work and for the enzymes of the stomach and small intestine to work more efficiently 2. Describe how food passes through the esophagus Food is pushed down the esophagus to the stomach through the process of peristalsis. Wave-like contractions alternate between contraction and relaxation to push the food through the entire digestive tract from the esophagus through the stomach, small intestine and large intestine. 3. Why would the enzymes in your mouth not work in your stomach and the enzymes in your stomach not work in your mouth?
Soluble Fibre when passing through the large intestine absorbs the water turning the faecal matter much softer, allowing the waste to pass through the body quickly. This type of Fibre is also known to help lower cholesterol levels in the blood. Soluble Fibre is found in: Fruits, Vegetables, Lentils, Peas, Beans, Oats, Barley, Oatmeal, Potatoes, Dried Fruit, Soya Milk and Soya Products. Insoluble Fibre is a Fibre that creates helpful bacteria that ferments making consumed substances soft and bulky, allowing the matter to pass through the body much quicker. Insoluble Fibre prevents constipation and lets a larger amount of faecal matter to be disposed from the body at once.