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cell biology > Ch. 5 > Flashcards

Ch. 5 Flashcards

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AP® Biology flashcards Biology 101 flashcards
1
Q

G-C have how many Hydrogens bonds holding them together

A

3

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2
Q

A-T forms how many hydrogen bonds

A

2

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3
Q

Proteins are encoded by DNA sequence, which is produced through ______ intermediate

A

RNA

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4
Q

DNA in eukaryotic cells is packaged in _____

A

chromosomes

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5
Q

Packaging of DNA allows chromosomes to be ______ during cell division

A

seperated

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6
Q

segements of DNA that contain instructions for making a particular protein or RNA molecule

A

genes

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7
Q

the _____ ______ mediates the orderly duplication and seperation of chromosomes

A

cell cycle

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8
Q

during the __ phase (interphase) of the cell cycle, chromosomes are replicated

A

S

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9
Q

most compacted structure of chromosomes is the ______ ______

A

mitotic chromosome

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10
Q

Where are rRNA genes, that are arranged together located

A

nucleolus

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11
Q

first level of chromosome packing is in the _____

A

nucleosome

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12
Q

what assembles to form chromatin fibers

A

DNA and nucleosomes

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13
Q

DNA wrapped around a protein core of 8 histones is what?

A

a nucleosome

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14
Q

histone proteins are not highly conserved among eukaryotes, true or false?

A

false

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15
Q

positively charged proteins that interact with the negatively charged DNA backbone

A

histones

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16
Q

what is the most condensed form of chromatin

A

metaphase chromatid

17
Q

gene expression is regulated by changing the ______ ______ (controlled by ATP)

A

chromatin structure

18
Q

histone modification can be modified to regulate gene expression, true or false?

A

true

19
Q

highly condensed and transcriptionally silent chromatin

A

heterochromatin

20
Q

less condensed and transcriptionally active

A

euchromatin

21
Q

barrier sequences in the heterochromatin stop complete silencing of the chromosome by ____ ____

A

histone modification enzymes

22
Q

inactivated X chromosome of female is seen as what type of chromatin in the nucleus

A

heterochromatin

cell biology (20 decks)

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