Test Bank Essential Cell Biology 5th Edition By Alberts | 9780393680379 | | Chapter 1-20 |all Chapters With Answers And Rationals

Which process moves an ion across a cell membrane against the concentration gradient? {Ans: active transport}Before mitosis begins, which happens before the nucleus starts dividing? {Ans: The DNA replicates.}Which describes how the plasma membrane helps to maintain homeostasis? {Ans: by regulating the contents of the cell from the external and internal environments}Cell membranes allow some molecules to move freely across the membrane, while other molecules are restricted. Which term BEST describes this capability of a cell membrane? {Ans: semipermeable}The cell is the basic unit of structure and function in all living organisms. Which describes the greatest difference between the cells of a baby gorilla and the cells of an adult gorilla? {Ans: The adult has more cells than the baby.}Chloroplasts absorb light energy. The function of the chloroplast is to {Ans: synthesize sugars.}The concentration of solutes differs on the two sides of a cell membrane that are permeable only to water. Which describes the movement of materials across the cell membrane? {Ans: Water will move by osmosis.}A patient visits the doctor for a checkup and is diagnosed with skin cancer. Which of the following is the MOST likely cause of this disease?