Quiz 2

Question 1

In receptor-mediated endocytosis, receptor molecules initially project to the outside of the cell. Where do they end up after endocytosis?

Answer 1

On the inside surface of the vesicle

Question 2

Thylakoids, DNA, and ribosomes are all components found in

Answer 2

Chloroplasts

Question 3

Primary objective of cell fractionation is to

Answer 3

Separate the major organelles so that their particular functions can be determined

Question 4

A protein that spans the phospholipid by layer one or more times

Answer 4

A transmembrane proteins

Question 5

A cell with a predominance of free ribosomes is most likely

Answer 5

Producing primarily cytoplasmic proteins

Question 6

Which of the following contains hydrolytic enzymes

Answer 6

Lysozyme

Question 7

Prokaryotes are classified as belonging to two different domains. What are those domains?

Answer 7

Bacteria and Archea

Question 8

Which of the following is a reasonable explanation for why unsaturated fatty acid’s help keep any membrane more fluid at lower temperatures

Answer 8

The double bonds form kinks in the Fatty acid tails preventing adjacent lipids for packing tightly

Question 9

Which plant cell organelle contains it’s own DNA and ribosomes?

Answer 9

Mitochondria

Question 10

The presence of cholesterol in the plasma membrane’s of some animals

Answer 10

Enables the membrane to stay fluid more easily when cell temperatures drops

Question 11

Movement of vesicles within the cell depends on the cellular structures

Answer 11

Microtubules and motor proteins

Question 12

In a plant cell, DNA may be found:

Answer 12

In the nucleus, mitochondria, and chloroplasts.

Question 13

Diffusion

Answer 13

It is a passive process in which molecules move from a region of higher concentration to a region of lower concentration

Question 14

White blood cells engulf bacteria through what process

Answer 14

Phagocytosis

Question 15

A bacterium engulfed by white blood cell through phagocytosis will be digested by enzymes contained in:

Answer 15

Lysosomes

Question 16

Ions diffuse across membranes there specific ion channels

Answer 16

Down there electrochemical gradients

Question 17

Which structure is the site of synthesis of proteins that may be exported from the cell

Answer 17

Rough endoplasmic reticulum

Question 18

In order for a protein to be an integral membrane protein it would have to be

Answer 18

Amphipathic, with at least one hydrophobic region

Question 19

According to the fluid Mosaic model of cell membranes, which of the following is a true statement the membrane phospholipids

Answer 19

They can move laterally along the plane of the membrane

Question 20

Which of the following is a characteristic feature of the carrier protein in a plasma membrane

Answer 20

It exhibits a specificity for the particular type of molecule

Question 21

Which of the following produces and modified’s polysaccharides that will be secreted:

Answer 21

Golgi apparatus

Question 22

Large numbers of ribosomes are present in cells that specialize in producing which of the following molecules

Answer 22

Proteins

Question 23

Which animal cell organelle contains enzymes that transfer hydrogen various substrates to oxygen

Answer 23

Peroxisome

Question 24

All of the following are part of a prokaryotic cell except

Answer 24

And endoplasmic reticulum

Question 25

Water passes quickly through so membranes because

Answer 25

It moves through aquaporn's in the membrane

Question 26

Which type of organelle or structure is primarily involved in the synthesis of all oils phospholipids and steroids

Answer 26

Smooth endoplasmic reticulum

Question 27

Which of the following are not embedded in the hydrophobic portion of the lipid bilayer at all

Answer 27

Peripheral proteins

Question 28

The primary function of polysaccharides attached to glycoproteins and glycolipids og animal cell membranes is:

Answer 28

To mediate cell to cell recognition

Question 29

The Balian good equivalent of 0.15 M NaCl. Seawater contains the equivalent of 0.45 M NaCl. What will happen if red blood cells are transferred to seawater?

Answer 29

Water will leave the cells causing them to shrivel and collapse

Question 30

What kinds of molecules pass through a cell membrane most easily

Answer 30

Small and hydrophobic

Question 31

Which of the following is true of integral membrane proteins

Answer 31

They are usually transmembrane proteins

Question 32

Which of the following would likely move through the lipid bilayer of plasma membrane most rapidly:

Answer 32

CO2

Question 33

The difference between Pinocytosis and receptor mediated endocytosis is that

Answer 33

Pinocytosis is nonselective in the molecules it brings into the cell, where is preceptor mediated endocytosis offers more selectivity

Question 34

In a liver cell detoxifying alcohol and some other poisons, the enzymes of the Piro peroxisome remove hydrogen from these molecules and

Answer 34

Transfer the hydrogen to oxygen molecules to generate hydrogen Prock

Question 35

Signals between the ECM in the cytoskeleton may be transmitted by

Answer 35

Integrins

Question 36

Ions can travel directly from the cytoplasm of one animal cell to the cytoplasm of anither through

Answer 36

Gap junctions

Question 37

What is the voltage across a membrane called

Answer 37

Membrane potential

Question 38

Which organelle is the primary site of ATP synthesis in eukaryotic cells

Answer 38

Mitochondria

Question 39

Which of the following types of molecules are major structural components of the cell membrane

Answer 39

Phospholipids and proteins

Question 40

mRNA and ribosomal subunits are made in this organelle

Answer 40

The nucleus

Question 41

The organelle that is considered as the little net can synthesize lipids and secretory lipids are called

Answer 41

Smooth endoplasmic reticulum and Rough endoplasmic reticulum respectively

Question 42

Why isn't the mitochondrion classified as part of the endomembrane system

Answer 42

It's structure is not derived from the ER or golgi apparatus

Question 43

One of the primary difference between prokaryotic cells and eukaryotic cells is

Answer 43

Prokaryotic cells do not have membrane-bound organelle's

Question 44

The organelle that a specialist in synthesizing sugar using certain pigments such as chlorophyll is the

Answer 44

Chloroplast

Question 45

The organelle that produces hydrogen peroxide and and I just other toxic metabolic byproducts is the

Answer 45

Peroxisome

Question 46

The shape and structure of the cell is maintained bye

Answer 46

Microtubules and microfilaments

Question 47

Small molecules such as ions can move from one cell to another via

Answer 47

Gap junctions

Question 48

Ions diffuse across membranes through specific ion channels

Answer 48

Down their elecrochemical gradient

Question 49

Variation in charge across the plasma membrane is called

Answer 49

Membrane potential