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BIOL181 week 2 quiz Questions with 100% Correct and Approved Answers Graded A++ $8.99   Add to cart
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BIOL181 week 2 quiz Questions with 100% Correct and Approved Answers Graded A++
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-?- involves the use of pre-existing gradient to drive the active transport of another solute. - CORRECT ANSWER -Secondary active transport -?- is a type of transport that involves pumping ions against a gradient using ATP as a source of energy. - CORRECT ANSWER -primary active transport 2 l...

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  • August 14, 2024
  • 17
  • 2024/2025
  • Exam (elaborations)
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BIOL181 week 2 quiz Questions with 100% Correct

and Approved Answers Graded A++
-?- involves the use of pre-existing gradient to drive the active transport of another solute. -

CORRECT ANSWER ✔✔ -Secondary active transport


-?- is a type of transport that involves pumping ions against a gradient using ATP as a source of

energy. - CORRECT ANSWER ✔✔ -primary active transport


2 leaflets of lipid bilayer are formed because of what? - CORRECT ANSWER ✔✔ -the polar

head groups of phospholipids can interact with polar interior and exterior of cell

3 main types of macromolecules that comprise plasma membranes are what? - CORRECT

ANSWER ✔✔ -proteins


carbohydrates

phospholipids


a (alpha) helix - CORRECT ANSWER ✔✔ -a type of protein secondary structure in which a

polypeptide forms a repeating helical structure stabilized by hydrogen bonds


A biological membrane that is fluid has what? - CORRECT ANSWER ✔✔ -individual

molecules that can move within the membrane

a disulfide bond between 2 cysteines in the same polypeptide chain can help to stabilize the -?-

structure of a protein. - CORRECT ANSWER ✔✔ -tertiary

,a disulfide bond can form between 2 cysteines located where? - CORRECT ANSWER ✔✔ -

within a polypeptide or between different polypeptide

a membrane protein that has a portion integrated into the hydrophobic region of the membrane is

called a what? - CORRECT ANSWER ✔✔ -integral membrane protein


a phospholipid molecule consists of what? - CORRECT ANSWER ✔✔ -a polar head and 2

nonpolar tails


a polypeptide is a chain of what? - CORRECT ANSWER ✔✔ -amino acids


a protein whose highest level of structure is tertiary structure contains what? - CORRECT

ANSWER ✔✔ -one polypeptide folded into its 3-dimensional structure


according to the fluid-mosaic model, membrane proteins and lipids are able to what? -

CORRECT ANSWER ✔✔ -to move relative to one another within a plasma membrane


active transport - CORRECT ANSWER ✔✔ -movement of a substance from a region of low

concentration to a region of high concentration with the aid of a transport protein and a source of

energy


active transport - CORRECT ANSWER ✔✔ -the transport of a solute across a membrane against

its gradient (from low to high), requires an input of energy, aid of transmembrane protein

all cells are surrounded by a what kind of membrane, meaning that the membrane allows the

passage of some molecules and ions but not others? - CORRECT ANSWER ✔✔ -selectively

permeable

, amino acid - CORRECT ANSWER ✔✔ -the building blocks of proteins, have a common

structure in which a carbon atom, called the a-carbon, is linked to an amino group and a carboxyl

group. the a-carbon is also linked to a hydrogen atom and a particular side chain


amino acids are categorized based on what? - CORRECT ANSWER ✔✔ -their side chains


amino group - CORRECT ANSWER ✔✔ --NH; positively charged at neutral pH; connects to

the backbone and a-carbon

an amino acid may be described as -?-, -?-, or -?- based on the chemical properties of its -?-

chain. - CORRECT ANSWER ✔✔ -a. nonpolar


b. polar uncharged

c. polar charged

d. side

an animal cell is placed in a hypertonic medium. Predict which way water will move. -

CORRECT ANSWER ✔✔ -water will move from inside the cell to the outside


an animal cell is placed in pure water (which contains no solutes). In what direction will the

water move? - CORRECT ANSWER ✔✔ -water will move into the cell from the outside


antiporter - CORRECT ANSWER ✔✔ -2 solutes move in opposite directions


antiporter - CORRECT ANSWER ✔✔ -a type of transporter that binds two or more ions or

molecules and transports them in opposite directions across a membrane

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