What factors might change the projected future population numbers? What Will Determine Future Population Trends? Population change reflects the interplay of fertility, mortality, and migration, but in less developed regions, where fertility levels are high, fertility has the greatest effect on future population size. How do researchers estimate what the population will be in the […]

What type of interaction stabilizes the alpha helix and beta pleated sheet structures of proteins? The most common types of secondary structures are the α helix and the β pleated sheet. Both structures are held in shape by hydrogen bonds, which form between the carbonyl O of one amino acid and the amino H of […]

What is a tentative explanation that can be tested? A hypothesis is a tentative explanation that can be tested by further observation. A theory is a hypothesis that has been supported with repeated testing. A scientific law is a statement that summarizes the results of many observations. Theories must agree with all observations made on […]

What occurs during the S phase of the cell cycle? S phase. In S phase, the cell synthesizes a complete copy of the DNA in its nucleus. It also duplicates a microtubule-organizing structure called the centrosome. The centrosomes help separate DNA during M phase. During which part of the cell cycle are two daughter cells […]

What is an example of oceanic oceanic convergence? Examples of ocean-ocean convergent zones are subduction of the Pacific Plate south of Alaska (creating the Aleutian Islands) and under the Philippine Plate, where it creates the Marianas Trench, the deepest part of the ocean. What is an example on earth of an oceanic oceanic convergent plate […]

What are 3 similarities between prokaryotic and eukaryotic cells? Simple, primitive cells are prokaryotic; they have no nucleus and no organelles encased in plasma membranes. Three similarities between prokaryotic and eukaryotic cells are that both have vesicles, vacuoles, and the ability to carry out the eight functions of life. What are the major differences between […]

How does deforestation increase carbon dioxide? Deforestation and the carbon cycle Forests store large amounts of carbon. Trees and other plants absorb carbon dioxide from the atmosphere as they grow. When forests are cleared or burnt, stored carbon is released into the atmosphere, mainly as carbon dioxide. What is the number 1 cause of deforestation? […]

What is difference between chordates and vertebrates? Chordates and vertebrates are two groups of higher animals. Both chordates and vertebrates are deuterostomes. Vertebrates are a type of advanced chordates. The main difference between chordates and vertebrates is that some chordates do not have a vertebral column whereas all vertebrates have a vertebral column. Are invertebrates […]

What is a smooth muscle? Smooth muscle, also called involuntary muscle, muscle that shows no cross stripes under microscopic magnification. Smooth muscle tissue, unlike striated muscle, contracts slowly and automatically. It constitutes much of the musculature of internal organs and the digestive system. How is smooth muscle different from skeletal muscle? Smooth muscle fibers are […]

What is the effect of bile salts on digestion of fats? Bile salts perform two important functions in the digestive tract: Act as detergents, emulsifying large fat droplets into small ones. This action creates a much larger surface area for the action of lipase in the small intestine, thereby increasing lipid absorption. What are the […]