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BMSC 220 CELL BIOL > Poll EV quizzes > Flashcards

Poll EV quizzes Flashcards

1
Q

What does cell theory state?

A

all living things are made up of cells

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2
Q

prokaryotic cells can be distinguished from eukaryotic cells by the absence of:

A

a nucleus

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3
Q

Which of the following is NOT a feature of prokaryotic and eukaryotic cells?
-ribosomes
-genetic info in DNA
-plasma membrane
-cytoplasmic organelles such as ER and golgi

A

Cytoplasmic organelles

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4
Q

Which type of biomolecule is the main source of quick energy for living things?

A

carbohydrates

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5
Q

What level of protein structure results from folding into a helices or bsheets?

A

secondary structure

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6
Q

Denaturation of a protein disrupts what structure(s)

A

disrupts secondary and tertiary structures

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7
Q

Which characteristic of a phospholipid contributes to membrane fluidity?

A

double bonds in the fatty acid tail

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8
Q

Most functions of cell membranes are carried out by:

A

proteins

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9
Q

How do cells transport small, nonpolar, hydrophobic molecules across a membrane?

A

these molecules diffuse freely

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10
Q

What is the role of ATP in primary active transport?

A

ATP is used to pump molecules against their concentration gradient

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11
Q

Which of the following can freely diffuse across a cell membrane
-oxygen
-potassium ions
-glucose
-protons

A

oxygen

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12
Q

Mitochondria are sites of (3)

A

-synthesis of certain amino acids
-synthesis of heme groups
-uptake of Ca ions

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13
Q

A biological redox reaction involves (3)

A

an oxidizing agent
-a reducing agent
- a gain of electrons

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14
Q

Why is oxygen needed for ATP synthesis?

A

oxygen acts as the final electron acceptor at the end of the ETC

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15
Q

What is a common characteristic of all proteins in the ECM?

A

the presence of domains with specific binding sites

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16
Q

All collagen family members consist of __ chains arranged in a __ in at least part of their length

A

3
triple helix

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17
Q

The endocytic pathway:

A

moves materials from the outside of the cell to the inside of the cell

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18
Q

The signal sequence is found on the N terminus of__

A

secretory proteins

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19
Q

Which structure is not a part of the endomembrane system?
-nuclear envelope
-mitochondria
-golgi
-ER

A

mitochondria

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20
Q

Where does glycosylation take place?

A

the golgi complex AND rough ER

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21
Q

Which process does not take place in the golgi complex?
-glycosylation of proteins’
-digestion of misfolded proteins
-processing membrane proteins
-processing lysosomal proteins

A

digestion of misfolded proteins

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22
Q

Which residues act as a delivery address of proteins to lysosomes?

A

mannose 6 phosphate

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23
Q

In phagocytosis, the phagosome fuses with which organelle leading to digestion?

A

lysosome

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24
Q

Do eukaryotic cells have a cytoskeleton?

A

yes

25
Q

Which cytoskeleton element does not associate with motor proteins

A

intermediate filaments

26
Q

Which direction does Kinesin 1 transport cargo?

A

outwardly towards + end of microtubules

27
Q

Which direction does dynein transport cargo?

A

inwardly towards the - end of microtubules

28
Q

What is a function of centrosomes?

A

facilitating microtubule nucleation

29
Q

Is there a difference between cilia and flagella?

A

no

30
Q

How many genes encode intermediate filaments?

A

70

31
Q

Are actin filaments associated with motor proteins?

A

yes

32
Q

What will cause DNA to have a higher melting temp?

A

higher GC content

33
Q

Transposase is an enzyme that ____

A

catalyzes transposon excision from a donor DNA site and its subsequent insertion to the target DNA site

34
Q

What is the histone structure consist of?

A

a core histone octamer + 1 linker histone

35
Q

______ is also known as light chromatin and can actively undergo ___

A

euchromatin, transcription

36
Q

The DNA protein complex that comprises eukaryotic chromosomes is called ___

A

chromatin

37
Q

the RNA POLYMERASE MOVES ALONG THE DNA TEMPLATE IN TEH ____ DIRECTION

A

3 - 5

38
Q

Prokaryotes have ___ RNA POLYMERASES, eukaryotes have ___

A

1, several

39
Q

Does eukaryotic transcription take place in the cytoplasm?

A

no

40
Q

the creation of a stop codon in the middle of a coding sequence is called a ____

A

nonsense mutation

41
Q

What is the amino acid used as a start codon?

A

methionine

42
Q

DNA methylation is thought to serve as an ____ marker

A

epigenetic

43
Q

In the absence of lactose, what is expected to happen in the LAC operon?

A

respressor protein will bind to the operator site

44
Q

The length of the POLYA tail is affects ____

A

longevity of mRNA

45
Q

Why is DNA replication called semiconservative?

A

each daughter duplex contains one strand from the parent structure

46
Q

When do most of the prep for mitosis occur, including DNA replication

A

interphase

47
Q

What is responsible for holding sister chromatids together after replication?

A

Cohesin

48
Q

Which stage of mitosis involves the reformation of the nuclear envelope, disassembly of the mitotic spindle?

A

telophase

49
Q

During ____ spindle fibres attach to the centromeres of each chromosome

A

prometaphase

50
Q

What enzyme will catalyze the cutting of PIP2 into IP3 and DAG in cell signalling?

A

phospholipase C

51
Q

RTKs are _______

A

autophosphorylated by its catalytic subunits

52
Q

A mutation that changes a codon sequence and subsequently changes the amino acid that should have been placed at that point is called a _______

A

missense mutation

53
Q

Transcription occurs in the ____ and translation occurs in the ___ of prokaryotic cells

A

cytoplasm for both

54
Q

following transcription the RNA has a complementary strand of the ____

A

template strand of DNA

55
Q

Which event occurs just adter eukaryotic mRNA being transcribed?

A

removal of introns

56
Q

The polyA tail is added to what molecules?

A

eukaryotic mRNA

57
Q

What will 3H thymidine do?

A

radiolabel newly synthesized DNA

58
Q

What event is most likely to trigger a delay in movement to anaphase through monitoring the spindle checkpoint?

A

failure to align at the metaphase plate

59
Q
A

BMSC 220 CELL BIOL (6 decks)

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