Answer:
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Explanation:
In a sample of double-stranded DNA, if the nitrogenous base guanine is 19%, then the nitrogenous base adenine will be 31%
Explanation:
In a double-stranded DNA, the four nitrogenous bases bind and pair together. The purine bases guanine (G) and adenine (A) pair with pyramidine bases cytosine (C) and thymine (T) respectively. The pairing will be between G-C and A-T bases.
According to Chargaff’s Rule, the percentage of each nitrogenous base will be equal in a pair. So the percentage of G will be equal to percentage of C and the percentage of A will be equal to percentage of T.
So if the guanine percentage is 19%, then applying Chargaff’s rule, cytosine will also be 19%
The remaining 68% will be shared with the adenine and thymine pair, of which adenine will be of 31% according to Chargaff’s rule.
The main essential nutrients that are best derived through a diet are carbohydrates, protein, fat, vitamins, minerals, and water.
Sources of carbohydrates include fruits, breads and grains, starchy vegetables, and sugars. Whole gains and fruit are recommended as they are full of fibre, reducing risks of heart disease, and reducing blood glucose levels.
Protein is the major structural component of cells and is responsible for the building and repair of body tissues. Protein is broken down into amino acids, which are building blocks of protein. 9/20 amino acids, known as essential amino acids, must be provided in the diet as they cannot be synthesized in the body. 10-35% of your daily calories should come from lean protein sources such as low-fat meat, dairy, beans or eggs.
Fat is an energy source that when consumed, increases the absorption of fat-soluble vitamins including vitamins A, D, E and K. Twenty to 35 percent of your daily intake should come from fat. Choose healthy options such as omega-3-rich foods like fish, walnuts and vegetable-based oils. Omega-3s help with development and growth. Limit intake of saturated fats such as high-fat meats and full-fat dairy. Other smart choices include nuts, seeds and avocado.
Vitamin C is necessary for the synthesis of collagen, which provides structure to blood vessels, bone and ligaments. Rich sources include citrus fruits, strawberries and peppers. Folate, found in foods, helps to prevent birth defects. Pregnant women or women who plan to become pregnant should speak with their physician about taking a folic acid supplement, the synthetic form of folate, in addition to their diet. Vitamin D helps to maintain calcium homeostasis. It can be found in food sources or synthesized by the sun.
Sodium helps to maintain fluid volume outside of the cells and helps cells to function normally. Keep intake under 2,400 milligrams per day. Potassium maintains fluid volume inside and outside of cells and prevents the excess rise of blood pressure with increased sodium intake. Rich sources include bananas, potatoes and tomatoes. Calcium helps to maintain and build strong bones and teeth. Include three servings of calcium-rich foods per day including milk, low-fat cheese and yogurt.
Water helps to maintain homeostasis in the body and transports nutrients to cells. Water also assists in removing waste products from the body. All beverages and high-moisture foods such as soup and watermelon contain water and count towards your daily water requirement. Adults should consume 25-35 milliliters of fluids per kilogram body weight or 2-3 liters per day.
Exercising regularly is an example of a healthy habit, it helps you get in better shape!! Hope this helps
