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Bio 181 > Quiz 2 > Flashcards

Quiz 2 Flashcards

1
Q

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

A

On the inside surface of the vesicle

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2
Q

Thylakoids, DNA, and ribosomes are all components found in

A

Chloroplasts

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3
Q

Primary objective of cell fractionation is to

A

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

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4
Q

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

A

A transmembrane proteins

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5
Q

A cell with a predominance of free ribosomes is most likely

A

Producing primarily cytoplasmic proteins

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6
Q

Which of the following contains hydrolytic enzymes

A

Lysozyme

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7
Q

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

A

Bacteria and Archea

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8
Q

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

A

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

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9
Q

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

A

Mitochondria

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10
Q

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

A

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

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11
Q

Movement of vesicles within the cell depends on the cellular structures

A

Microtubules and motor proteins

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12
Q

In a plant cell, DNA may be found:

A

In the nucleus, mitochondria, and chloroplasts.

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13
Q

Diffusion

A

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

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14
Q

White blood cells engulf bacteria through what process

A

Phagocytosis

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15
Q

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

A

Lysosomes

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16
Q

Ions diffuse across membranes there specific ion channels

A

Down there electrochemical gradients

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17
Q

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

A

Rough endoplasmic reticulum

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18
Q

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

A

Amphipathic, with at least one hydrophobic region

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19
Q

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

A

They can move laterally along the plane of the membrane

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20
Q

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

A

It exhibits a specificity for the particular type of molecule

21
Q

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

A

Golgi apparatus

22
Q

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

A

Proteins

23
Q

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

A

Peroxisome

24
Q

All of the following are part of a prokaryotic cell except

A

And endoplasmic reticulum

25
Q

Water passes quickly through so membranes because

A

It moves through aquaporn’s in the membrane

26
Q

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

A

Smooth endoplasmic reticulum

27
Q

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

A

Peripheral proteins

28
Q

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

A

To mediate cell to cell recognition

29
Q

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?

A

Water will leave the cells causing them to shrivel and collapse

30
Q

What kinds of molecules pass through a cell membrane most easily

A

Small and hydrophobic

31
Q

Which of the following is true of integral membrane proteins

A

They are usually transmembrane proteins

32
Q

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

A

CO2

33
Q

The difference between Pinocytosis and receptor mediated endocytosis is that

A

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

34
Q

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

A

Transfer the hydrogen to oxygen molecules to generate hydrogen Prock

35
Q

Signals between the ECM in the cytoskeleton may be transmitted by

A

Integrins

36
Q

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

A

Gap junctions

37
Q

What is the voltage across a membrane called

A

Membrane potential

38
Q

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

A

Mitochondria

39
Q

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

A

Phospholipids and proteins

40
Q

mRNA and ribosomal subunits are made in this organelle

A

The nucleus

41
Q

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

A

Smooth endoplasmic reticulum and Rough endoplasmic reticulum respectively

42
Q

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

A

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

43
Q

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

A

Prokaryotic cells do not have membrane-bound organelle’s

44
Q

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

A

Chloroplast

45
Q

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

A

Peroxisome

46
Q

The shape and structure of the cell is maintained bye

A

Microtubules and microfilaments

47
Q

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

A

Gap junctions

48
Q

Ions diffuse across membranes through specific ion channels

A

Down their elecrochemical gradient

49
Q

Variation in charge across the plasma membrane is called

A

Membrane potential

Bio 181 (5 decks)

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