How does the eye adapt to different light conditions? Rhodopsin is the photopigment used by the rods and is the key to night vision. Intense light causes these pigments to decompose reducing sensitivity to dim light. Darkness causes the molecules to regenerate in a process called “ dark adaptation” in which the eye adjusts to […]

What does surface area have to do with cell size? The important point is that the surface area to the volume ratio gets smaller as the cell gets larger. Thus, if the cell grows beyond a certain limit, not enough material will be able to cross the membrane fast enough to accommodate the increased cellular […]

How does the shape of the moon change over 4 weeks? The Moon appears to change shape because we see different amounts of the lit part as the Moon orbits Earth. As it moves around Earth, more and more of the lit side comes into view. Then it begins to disappear again. It takes 29.5 […]

What chemical reactions do enzymes catalyze? Enzymes catalyze chemical reactions by lowering activation energy barriers and converting substrate molecules to products. What two types of reactions are enzymes involved in? Enzymes are biological catalysts Enzymes are the catalysts involved in biological chemical reactions. They are the “gnomes” inside each one of us that take molecules […]

Where does both mechanical and chemical digestion occur? Digestion is a process that converts nutrients in ingested food into forms that can be absorbed by the gastrointestinal tract. Proper digestion requires both mechanical and chemical digestion and occurs in the oral cavity, stomach, and small intestine. What is the first place mechanical digestion takes place? […]

What causes corals to appear bleached? The leading cause of coral bleaching is climate change. A warming planet means a warming ocean, and a change in water temperature—as little as 2 degrees Fahrenheit—can cause coral to drive out algae. Coral may bleach for other reasons, like extremely low tides, pollution, or too much sunlight. What […]

How is a single covalent bond formed? Single covalent bonds occur when one pair of electrons is shared between atoms as part of a molecule or compound. A single covalent bond can be represented by a single line between the two atoms. What happens to the electrons when two atoms form a covalent bond? Covalent […]

Which criteria do scientists consider when they classify soil check all that apply? Answer: Climate and soil composition are the answers because these 2 things are the first ones that scientists look at when classifying soil. Which parts of soil are classified by their particle size check all that apply? Clay, sand, and silt are […]

When are embryonic stem cells extracted? Embryonic stem cells are usually harvested shortly after fertilization (within 4-5 days) by transferring the inner cell mass of the blastocyst into a cell culture medium, so that the cells can be multiplied in a laboratory. What is the origin of embryonic stem cells? Human embryonic stem cells originate […]

What are 3 types of animal cells? State the various types of animal cells. Skin Cells. Muscle Cells. Blood Cells. Nerve cells. Fat Cells. What is produced by animal cells? Mitochondria are the energy-producing organelles, commonly known as “the powerhouse of the cell.” The process of cellular respiration occurs in the mitochondria. During this process, […]