FREE BIOLOGY AND STUDY GAMES ABOUT BIO 2401

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FREE BIOLOGY AND STUDY GAMES ABOUT BIO 2401

CHAPTER 3 EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -159 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation Question 1: An uncharged, nonpolar "tail" that is made of two fatty acid chains and is

_____.

Answer:

hydrophobic Question 2: _____ is the actual coming together and touching of cells, and it is the means by which cells recognize one another.

Answer:

contact signaling Question 3: Water also moves freely and reversibly through water-specific channels constructed by transmembrane proteins called ______.

Answer:

aquaporins (AQPs) Question 4: During the ____, DNA is replicated, ensuring that the two future cells being created will receive identical copies of the genetic material.

Answer:

S phase

Question 5: In ____ ("cell drinking") also called fluid-phase endocytosis, a bit of infolding plasma membrane (which begins as a clathrin-coated pit) sorrounds a very small volume of extra cellular fluid containing dissolved molecules.

Answer:

pinocytosis Question 6: Although there is continuous traffic across the plasma membrane, it is a ____, or _____, ____ barrier, meaning that it allows some substances to pass while excluding others.

Answer:

selectively, or differentially, permeable Question 7: Using the incoming RNA nucleotides as substrates, the RNA polymerase aligns them with complementary DNA bases on the template strand and then links them together.

Answer:

Elongation Question 8: one or more intracellular chemical signals commonly called ____, are generated and connect plasma membrane events to the internal metabolic machinery of the cell.

Answer:

second messengers Question 9: An equally important result is the generation of a ____, or voltage, across the membrane.

Answer:

potential membrane

Question 10: Most plasma membrane receptors are involved in ______.

Answer:

chemical signaling Question 11: Each lollipop-shaped phospholipid molecule has a polar "head" that is charged and is ______.

Answer:

hydrophilic

Question 12: The development of specific and distinctive features in cells is called ______.

Answer:

cell differentiation

Question 13: What are the membranous organelles?

Answer:

mitochondria, peroxisomes, lysosomes, endoplasmic reticulum, and Golgi apparatus.Question 14: About 20% of the outer membrane surface contains _____, dynamic assemblies of saturated phospholipids associated with unique lipids sphingolipids and lots of cholesterol.

Answer:

lipid rafts Question 15: Vesicular transport is also used for combination processes such as _____, moving substances into, across, and the out of the cell, and ____, or ____, _____, moving substances from one area (or organelle) in the cell to another.

Answer:

transcytosis; substance, or vesicular, trafficking Question 16: The thee types of rods in order of increasng size in the cytoskeleton are ____, ____ and ____.

Answer:

microfilaments, intermediate filaments, and microtubules.Question 17: Those in which the cell ingests small patches of the plasma membrane and moves substances from the cell exterior to the cell interior are called ____.

Answer:

endocytosis

Question 18: Its ribosomes manufacture all proteins secreted from cells.

Answer:

Rough endoplasmic reticulum

Question 19: The total concentration of all solute particles in a solution is referred to as the solution's _____.

Answer:

osmolarity Question 20: Solutions with the same concentrations of nonpenetrating solutes as those found in cells are _____.

Answer:

isotonic

Question 21: ____ division of the nucleus

Answer:

mitosis Question 22: ____ is the series of changes a cell goes through from the time it is formed until it reproduces.

Answer:

cell life cycle Question 23: _____, a series of integral proteins molecules (including occludins and claudins) in the plasma membranes of adjacent cells fuse together, forming an _____ that encircles the cell.

Answer:

tight junction; impermeable junction Question 24: ______ are transmembrane integral proteins that show specificity for molecules of a certain polar substance or class of substances that are too large to pass through membrane channels, such as sugars and amino acids.

Answer:

carriers Question 25: The ability of a solution to change the shape or tone of cells by altering their internal water volume is called _____.

Answer:

tonicity