FREE AND STUDY GAMES ABOUT BIOLOGY QUIZ 4 EXAM

PDF Download

FREE AND STUDY GAMES ABOUT BIOLOGY QUIZ 4 EXAM

QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -62 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: isotonic

Answer:

situation in which the extracellular fluid has the same osmolarity as the fluid inside the cell, resulting in no net water movement into or out of the cell

Question 2: solute

Answer:

substance dissolved in a liquid to form a solution

Question 3: osmosis

Answer:

transport of water through a semipermeable membrane according to the water's concentration gradient across the membrane that results from the presence of solute that cannot pass through the membrane

Question 4: antiporter

Answer:

transporter that carries two ions or small molecules in different directions

Question 5: Which of the following statements correctly describes osmosis?

Answer:

In osmosis, water moves across a membrane from areas of lower solute concentration to areas of higher solute concentration.

Question 6: peripheral protein

Answer:

protein at the plasma membrane's surface either on its exterior or interior side

Question 7: hypertonic

Answer:

situation in which extracellular fluid has a higher osmolarity than the fluid inside the cell, resulting in water moving out of the cell

Question 8: fluid mosaic model

Answer:

describes the plasma membrane's structure as a mosaic of components including phospholipids, cholesterol, proteins, glycoproteins, and glycolipids (sugar chains attached to proteins or lipids, respectively), resulting in a fluid character (fluidity)

Question 9: symporter

Answer:

transporter that carries two different ions or small molecules, both in the same direction

Question 10: According to the fluid mosaic model, a membrane ________.

Answer:

is composed of a fluid bilayer of phospholipids with embedded amphipathic proteins

Question 11: channel protein

Answer:

membrane protein that allows a substance to pass through its hollow core across the plasma membrane Question 12: Celery stalks that are immersed in fresh water for several hours become stiff.Similar stalks left in a 0.15 M salt solution become limp. From this we can deduce that the fresh water ________.

Answer:

is hypotonic and the salt solution is hypertonic to the cells of the celery stalks

Question 13: Which form of transport requires the expenditure of energy?

Answer:

Active transport Question 14: Cell membranes have distinct inside and outside faces. Which of the following statements is the most likely explanation for the membrane's asymmetrical nature?

Answer:

The two sides of a cell membrane face different environments and carry out different functions.

Question 15: How many layers of phospholipids make up the plasma membrane?

Answer:

2

Question 16: diffusion

Answer:

passive transport process of low-molecular weight material according to its concentration gradient

Question 17: passive transport

Answer:

method of transporting material through a membrane that does not require energy Question 18: Which of the following statements is a reasonable explanation for why unsaturated fatty acids help keep a membrane more fluid at lower temperatures?

Answer:

The double bonds form kinks in the fatty acid tails, preventing adjacent lipids from packing tightly.

Question 19: The passive transport of water is specifically called ________.

Answer:

osmosis

Question 20: facilitated transport

Answer:

process by which material moves down a concentration gradient (from high to low concentration) using integral membrane proteins

Question 21: hydrophobic

Answer:

molecule that does not have the ability to bond with water; "water-hating"

Question 22: concentration gradient

Answer:

area of high concentration adjacent to an area of low concentration

Question 23: uniporter

Answer:

transporter that carries one specific ion or molecule

Question 24: pump

Answer:

active transport mechanism that works against electrochemical gradients Question 25: What will happen to a red blood cell (RBC), which has an internal ion content of about 0.9%, if it is placed into a beaker of pure water?

Answer:

The cell would swell because the water in the beaker is hypotonic relative to the cytoplasm of the RBC.Question 26: Which of the following is an accurate description of the plasma membrane?

Answer:

Two layers of phospholipids with a number of proteins embedded within

Question 27: primary active transport

Answer:

active transport that moves ions or small molecules across a membrane and may create a difference in charge across that membrane

Question 28: carrier protein

Answer:

membrane protein that moves a substance across the plasma membrane by changing its own shape