The _______ of a phospholipid molecule will sock water, while the _______ of the
ID: 96185 • Letter: T
Question
The _______ of a phospholipid molecule will sock water, while the _______ of the molecule will avoid water. A. Tail: Head B. Hydrophobic portion: hydrophilic portion C. Fatty acid: phosphate group D. Head: tail Membrane proteins perform all of the following functions except: A. Maintenance of membrane fluidity B. Structural support C. Cell recognition D. Communication E. Transport Diffusing molecules move _______ until they are _______ A. Up their concentration gradients: evenly distributed B. Down their concentration gradients: evenly distributed C. Through channels of active transport proteins: evenly distributed D. Up their concentration gradients: unevenly distributed E. Down their concentration gradients: unevenly distributed Red blood cells (RBC) placed in pure water will swell and burst. What process is causing this to happen? A. Water is diffusing across the plasma membrane from a region of low (outside of the cell) to high (inside of the cell) water concentration B. Water is being pulled into the cell by the cell's solutes C. Water is diffusing across the plasma membrane from a region of high (outside of the cell) to low (inside of the cell) water concentration D. Solutes are being drawn into the cell across the plasma membrane E. Ions are diffusing across the plasma membrane and destabilizing the phospholipids In the ATP/ADP cycle: A. Food provides the energy needed to link phosphate to ADP and make ATP B. Food provides the energy to break down ATP into ADP C. Converting ADP into ATP yields energy, whereas converting ADP to ATP uses energy D. After powering a reaction, ADP becomes ATP The energy released during _______ reactions can be used to drive _______ reactions, and this is called a _______ reaction A. Endergonic: exergonic: coupled B. Exergonic: endergonic: coupled C. Endergonic: exergonic: mutually dependent D. Exergonic, endergonic: mutually dependentExplanation / Answer
Answer:
14). D. Head, tail
Explanation:
Each lipid molecule contains a hydrophilic region, also called a polar head region, and a hydrophobic, or nonpolar tail region.
15). A. Maintainance of membrane fluidity
Explanation:
The membrane fluidity refers to the viscosity of the lipid (cholesterol) bilayer of a cell membrane or a synthetic lipid membrane.
16). B. Down their concentration gradient; evenly distributed
Explanation:
Diffusion is a process by which a substance goes down its concentration gradient. Diffusion is the passive movement of molecules from an area of higher concentration to areas of lower concentration. In a closed environment, molecules will disperse until they reach a state a dynamic equilibrium.
17). C. Water is diffusing across the plasma membrane from a region of high (outside of the cell) to low (inside of the cell) water concentration.
Explanation:
Pure water consists of high water concentration and red blood cells consists low water concentration, so that water moves from its high concentration to low concentration.
18). A. Food provides the energy needed to link phosphate to ADP and make ATP
Explanation:
The energy is used to add one molecule of inorganic phosphate (P) to a molecule of adenosine diphosphate (ADP). The amount of energy stored is about 7,300 calories for every mole of ATP formed.
19). B. Exergonic; endergoing; coupled
Explanation:
A coupled reaction is one in which energy from an exergonic reaction is used to drive an endergonic reaction. The energy released from an exergonic reaction can be used to drive an energy-requiring endergonic reaction.
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