DNA Packing Part A The letter A indicates _____. supercoils a nucleosome a DNA double helix histones loops Correct This is a decondensed DNA double helix. Part B Where would RNA polymerase attach? A B C A and B B and C Correct RNA polymerase attaches to DNA. Part C The letter C indicates _____. supercoils a nucleosome… Read More »

Part A Which of these equations best summarizes photosynthesis? H2O → 2 H+ + 1/2 O2 + 2e– C6H12O6 + 6 O2 → 6 CO2 + 6 H2O + Energy 6 CO2 + 6 H2O → C6H12O6 + 6 O2 C6H12O6 + 6 O2 → 6 CO2 + 12 H2O 6 CO2 + 6 O2 → C6H12O6 + 6 H2O Correct This is the equation that summarizes the reactions of photosynthesis.… Read More »

Part A Which molecule is metabolized in a cell to produce energy for performing work? ADP Glucose ATP Phosphate Correct Glucose is used to produce high-energy ATP in a cell. Part B True or false? The potential energy in an ATP molecule is derived mainly from its three phosphate groups. True False Correct The three phosphate groups in… Read More »

Part A In muscle cells, fermentation produces _____. carbon dioxide, ethanol, NADH, and ATP carbon dioxide, ethanol, and NAD+ pyruvate lactate, NADH, and ATP lactate and NAD+ Correct These are the products of fermentation as it occurs in muscle cells. Part B In fermentation _____ is reduced and _____ is oxidized. lactate … ethanol NADH … lactate lactate… Read More »

Part A What is the function of Structure E? structural support of the cell detection of environmental change transport across the plasma membrane stabilization of the phospholipids cell-cell communication Correct Cholesterol helps to stabilize the structure of the plasma membrane. Part B Identify Structure D. cholesterol glycoprotein protein phospholipid bilayer of membrane extracellular matrix Correct Phospholipids can be… Read More »

Part A Structure A in this animation is a(n) _____. To view the animation, click here. Then click on structure A in the image to start the animation. transport protein receptor molecule antibody structural protein enzyme Correct The protein is allowing solute molecules to enter the cell. Part B Which of these cannot rapidly pass directly through the phospholipids… Read More »

Diffusion and Osmosis Part A Which of the following factors does not affect membrane permeability? Temperature The polarity of membrane phospholipids The saturation of hydrocarbon tails in membrane phospholipids The amount of cholesterol in the membrane Correct Phospholipids contain both a polar head and a nonpolar hydrocarbon tail, both of which are necessary for their ability to form membrane bilayers.… Read More »

Part A The process shown in this animation is referred to as _____. To view the animation, click here. Then click on the image to start the animation. osmosis pinocytosis facilitated diffusion phagocytosis active transport Correct Diffusion is occurring via a transport protein. Part B Structure A is a _____. water molecule transport protein solvent phospholipid solute Correct A… Read More »

Part A What name is given to the process by which water crosses a selectively permeable membrane? osmosis passive transport phagocytosis pinocytosis diffusion Correct Osmosis is the passive transport of water. Part B This cell is in a(n) _____ solution. isotonic hypertonic hypertonic or isotonic hypotonic and isotonic hypotonic Correct There is a greater concentration of solute outside… Read More »

Part A Which of the following statements is TRUE with regard to this animation? To view the animation, click here. Then click on the membrane transport protein to start the animation. The cell is not expending energy. Both sodium and potassium ions are transported against their concentration gradients. Potassium ions are transported down their concentration gradient. Sodium ions are… Read More »