4) movement of materials across the cell membrane using energy is called whereas the movement of materials across the cell membrane without using energy is a) active transport; passive transport b) passive transport; active transport 5) during passive transport, materials move from high concentration of material on one side of the membrane to low concentration of materials on the other side of the membrane. this difference in concentration of a material across the membrane is called the a) concentration deviation b) concentration transition c) concentration gradient 6) the two types of active transport that uses vesicles to move large particles across the membrane are which moves material into the cell, and which moves material out of the cell. a) sodium potassium pump; osmosis b) endocytosis; exocytosis c) exocytosis; facilitated diffusion 7) which process is the movement of water across the cell membrane? a) diffusion b) osmosis c) hydrocytosis

Every compound can be represented by a chemical formula. a chemical formula is the set of symbols showing the elements that make up a compound and their proportions. water’s chemical formula is h 2 2 o. that means a molecule of water contains two atoms of hydrogen and one atom of oxygen chemically bonded. a molecule is a group of two or more atoms bonded together. molecules can range in size from two to thousands of atoms. a molecule of a compound is the smallest unit of that compound. every molecule of water has all the physical and chemical properties of water. that’s because every molecule of water is made of the same elements in the same proportions: two hydrogen atoms and one oxygen! which of the following is a true statement? a every molecule of the same compound will have different properties. b every molecule of a compound has the same proportion of elements. c molecules can be physically separated into smaller units of a compound. d molecules cannot be represented by chemical formulae.

What are the types of mutations, and how does each alter the encoded protein? college level answer

'which of these statements about the scientific method is not true? all experiments must follow the same number of steps in the procedure. experiments may be repeated several times. some unexpected results can be beneficial. experimental results may or may not support the hypothesis.