Biology, 30.07.2019 12:30, fanta47

Transport of materials into a cell against a concentration gradient, from low to high, requires a) water. b) energy. c) osmosis. d) a passageway.

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Biology, 03.07.2019 18:00, conyers234

1. which mechanism requires energy to move materials? a. exocytosis b. osmosis c. diffusion of ions through potassium channel 2. facilitated diffusion is a process that involves a. the expenditure of energy as atp b. the selective movement of substances based on molecule size c. the use of special proteins to channels materials through the cell membrane 3. which of the following processes does not require a concentration gradient? a. osmosis b. facilitated diffusion c. active transport 4. a hypotonic solution is one whose concentration is a. equal to that inside a cell b. less than that inside a cell

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Biology, 27.07.2019 23:10, ineedhelp2285

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

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Biology, 29.07.2019 04:30, shadowsnake

1. what is mitosis in a living cell? a. the separation of the genetic material of a cell into two completely identical sets, one for each of the daughter cells created during cell division b. the creation of two daughter cells with half the number of chromosomes that the parent cell has by the process of cell division c. the creation of a larger amount of cytoplasmic material that can then be split among the daughter cells of a parent cell d. the separation of existing genetic material by splitting chromatids at the centromere to create two similar nuclei in another cell 2. what is the best definition of diffusion? a. random movement of molecules across a concentration gradient until the difference in concentration between two regions is near zero b. a process in which molecules move across a semipermeable membrane until the number of molecules of water is nearly equal on both sides c. net movement of molecules across a permeable membrane bilayer that requires transport proteins d. the exchange of solute molecules across a permeable membrane from areas of high concentration to areas of low concentration 3. what characteristic makes osmosis different from diffusion? a. osmosis occurs through a semipermeable membrane. diffusion occurs through a permeable membrane. b. net movement in osmosis is from areas of higher concentration to areas of lower concentration. net movement in diffusion occurs from areas of higher concentration to areas of lower concentration. c. osmosis requires facilitation by an energy-carrying molecule, such as atp. diffusion requires no additional energy to move molecules across the concentration gradient. d. osmosis is used for gases, such as oxygen and carbon dioxide. diffusion is used for water that contains salt or sugar molecules.

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Biology, 23.10.2019 04:00, huneymarie

Name section 4: diffusion and osmosis study guide b key concept materials move across membranes because of concentration differences vocabulary passive transport diffusion concentration gradient osmosis isotonic hypertonic hypotonic facilitated diffusion main idea: diffusion and osmosis are types of passive transport. 1. what is a concentration gradient? 2. what does it mean for a molecule to diffuse down a concentration gradient?

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