Where do chemicals pass between cells and blood? The capillaries are where molecules are exchanged between the blood and the body’s cells. The walls of capillaries are just one cell thick. Capillaries therefore allow molecules to diffuse across the capillary walls. What gas is removed from the body? At each cell in your body, oxygen […]

What are personal beliefs? A belief is an idea that a person holds as being true. A person can base a belief upon certainties (e.g. mathematical principles), probabilities or matters of faith. A belief can come from different sources, including: a person’s own experiences or experiments. Which two explanations are based on personal beliefs? Answer: […]

What resources are needed to produce meat? It takes 2,500 gallons of water, 12 pounds of grain, 35 pounds of topsoil and the energy equivalent of one gallon of gasoline to produce one pound of feedlot beef. Because of over-consumption of fish, all 17 of the world’s major fishing areas have reached or exceeded their […]

How does temperature affect the ripening of fruit? Too high a temperature destroys enzymes, and too low a temperature can break down the cell walls of the fruit so the contents mix and the fruit oxidizes, browns and softens abnormally. The optimum temperature and humidity conditions for ripening are 62 to 68 degrees Fahrenheit and […]

What enzyme breaks down fats into fatty acids and glycerol? Lipases What reaction breaks down proteins into amino acids? enzymatic hydrolysis Which enzyme converts proteins into amino acids? trypsin What converts polypeptides into amino acids? In human digestion, proteins in food are broken down into smaller peptide chains by digestive enzymes such as pepsin, trypsin, […]

How does frequency and wavelength change from one color to the next? Since wavelength is inversely proportional to frequency the color sequence gets reversed. 400 nm is a dull violet (but violet always appears dull). Wavelength varies with the speed of light, which varies with medium. The speed of light is about 0.03% slower in […]

Does hydrogen have 1 proton? A hydrogen atom is made of one proton and one electron. Because hydrogen has one proton, it has an atomic number of one. It is the only element whose atoms don’t have any neutrons. Helium has an atomic number of two; helium has two protons, two neutrons, and two electrons. […]

What is the highest latitude a place can have? 90 Which of the following locations has the largest annual temperature range? Siberia, the largest region in Russia, experiences an annual temperature range of 140°F (-70°F to 70°F), the greatest on Earth. On which summer day would you expect the greatest temperature range? The greatest temperature […]

What was the first vertebrate to live on land? Amphibians During which period did the first vertebrates make their way onto land? Around 370 million years ago, late in what we call the Devonian era, the first fish began to crawl out of the primordial ooze and onto the shores of a new, terrestrial world. […]

Why is it important for fertilizers to be water soluble? Being readily soluble in water, Water soluble fertilisers (WSF) help fertigation* by releasing essential plant nutrients at the root zone from where they are readily absorbed and used elsewhere in the plant system. What is soluble fertilizer? Water soluble fertilizers are fertilizers that can be […]