Question 1

Cell membranes are composed principally of

Accepted Answer

A)  carbohydrates. 
B)  nucleic acids. 
C)  phospholipids. 
D)  proteins. 
A)  carbohydrates. 
B)  nucleic acids. 
C)  phospholipids. 
D)  proteins.

Question 2

Molecules that traverse a membrane against their concentration gradient do so by _______ transport.

Accepted Answer

A)  active 
B)  passive 
C)  carrier-mediated 
D)  channel-mediated 
A)  active 
B)  passive 
C)  carrier-mediated 
D)  channel-mediated

Question 3

Transmembrane proteins are water-insoluble. Why?

Accepted Answer

Hydrophobic portions of transmembrane pr

Question 4

Which of the following is not a basic amino acid?

Accepted Answer

A)  Arginine 
B)  Glutamine 
C)  Histidine 
D)  All of the above are basic amino acids. 
A)  Arginine 
B)  Glutamine 
C)  Histidine 
D)  All of the above are basic amino acids.

Question 5

Coenzymes serve as _______ of several types of chemical groups.

Accepted Answer

The answer of Coenzymes serve as _______ of several types...

Question 6

What kind of bonds hold together the two chains of insulin?

Accepted Answer

The answer of What kind of bonds hold together the...

Question 7

Cell membranes are _______ permeable to small, uncharged molecules, while transport of larger polar or charged substances through membranes occurs via _______ or _______ proteins.

Accepted Answer

selectivel

Question 8

Passive transport across a membrane refers to

Accepted Answer

A)  transport into the interior of a cell. 
B)  transport out of a cell. 
C)  transport in the energetically favorable direction. 
D)  simple diffusion across membranes, without the help of proteins such as channels or carriers. 
A)  transport into the interior of a cell. 
B)  transport out of a cell. 
C)  transport in the energetically favorable direction. 
D)  simple diffusion across membranes, without the help of proteins such as channels or carriers.

Question 9

A rat's liver is respiring actively, and you supply the liver with glucose labeled with carbon-14. Which of the following will rapidly become radioactively labeled: water, carbon dioxide, or NADH?

Accepted Answer

One must consider here the inputs to, an

Question 10

Because phospholipids consist of hydrophobic hydrocarbon chains and hydrophilic head groups, they are _______ molecules.

Accepted Answer

The answer of Because phospholipids consist of hydrophobic hydrocarbon chains...

Question 11

A few sugars joined together are called a(n)

Accepted Answer

A)  glycoside. 
B)  oligosaccharide. 
C)  polysaccharide. 
D)  starch. 
A)  glycoside. 
B)  oligosaccharide. 
C)  polysaccharide. 
D)  starch.

Question 12

Sugars can cyclize if they contain _______ or more carbons.

Accepted Answer

A)  four 
B)  five 
C)  six 
D)  seven 
A)  four 
B)  five 
C)  six 
D)  seven

Question 13

One conclusion derived from the Singer and Nicolson fluid mosaic model of membrane structure is that integral membrane proteins are freely soluble in water.

Accepted Answer

A) True 
 B)False

Cell membranes are composed principally of

Molecules that traverse a membrane against their concentration gradient do so by _______ transport.

Transmembrane proteins are water-insoluble. Why?

Which of the following is not a basic amino acid?

Coenzymes serve as _______ of several types of chemical groups.

What kind of bonds hold together the two chains of insulin?

Cell membranes are ___ permeable to small, uncharged molecules, while transport of larger polar or charged substances through membranes occurs via _ or _____ proteins.

Passive transport across a membrane refers to

A rat's liver is respiring actively, and you supply the liver with glucose labeled with carbon-14. Which of the following will rapidly become radioactively labeled: water, carbon dioxide, or NADH?

Because phospholipids consist of hydrophobic hydrocarbon chains and hydrophilic head groups, they are _______ molecules.

A few sugars joined together are called a(n)

Sugars can cyclize if they contain _______ or more carbons.

One conclusion derived from the Singer and Nicolson fluid mosaic model of membrane structure is that integral membrane proteins are freely soluble in water.

An Overview of Cells and Cell Research

Bioenergetics and Metabolism

Fundamentals of Molecular Biology

Genomics, Proteomics, and Systems Biology

Genes and Genomes

Replication, Maintenance, and Rearrangements of Genomic Dna

RNA Synthesis and Processing

Transcriptional Regulation and Epigenetics

Protein Synthesis, Processing, and Regulation

The Nucleus

Protein Sorting and Transport

Mitochondria, Chloroplasts, and Peroxisomes

The Cytoskeleton and Cell Movement

The Plasma Membrane

Cell Walls, the Extracellular Matrix, and Cell Interactions

Cell Signaling

The Cell Cycle

Cell Death and Cell Renewal

Cancer

Filters

Exam 2: Molecules and Membranes

Cell membranes are composed principally of

Molecules that traverse a membrane against their concentration gradient do so by _______ transport.

Transmembrane proteins are water-insoluble. Why?

Which of the following is not a basic amino acid?

Coenzymes serve as _______ of several types of chemical groups.

What kind of bonds hold together the two chains of insulin?

Cell membranes are _______ permeable to small, uncharged molecules, while transport of larger polar or charged substances through membranes occurs via _______ or _______ proteins.

Passive transport across a membrane refers to

A rat's liver is respiring actively, and you supply the liver with glucose labeled with carbon-14. Which of the following will rapidly become radioactively labeled: water, carbon dioxide, or NADH?

Because phospholipids consist of hydrophobic hydrocarbon chains and hydrophilic head groups, they are _______ molecules.

A few sugars joined together are called a(n)

Sugars can cyclize if they contain _______ or more carbons.

One conclusion derived from the Singer and Nicolson fluid mosaic model of membrane structure is that integral membrane proteins are freely soluble in water.

An Overview of Cells and Cell Research

Bioenergetics and Metabolism

Fundamentals of Molecular Biology

Genomics, Proteomics, and Systems Biology

Genes and Genomes

Replication, Maintenance, and Rearrangements of Genomic Dna

RNA Synthesis and Processing

Transcriptional Regulation and Epigenetics

Protein Synthesis, Processing, and Regulation

The Nucleus

Protein Sorting and Transport

Mitochondria, Chloroplasts, and Peroxisomes

The Cytoskeleton and Cell Movement

The Plasma Membrane

Cell Walls, the Extracellular Matrix, and Cell Interactions

Cell Signaling

The Cell Cycle

Cell Death and Cell Renewal

Cancer

Filters

Cell membranes are ___ permeable to small, uncharged molecules, while transport of larger polar or charged substances through membranes occurs via _ or _____ proteins.