Unit 8: DNA and cell division Flashcards

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1
Q

nucleotide

A

the subunit of DNA a sugar, phosphate, and a base

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2
Q

Where the DNA is in the cell

A

nucleus

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3
Q

chromosome

A

one DNA molecule tightly packaged

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4
Q

double helix

A

the shape of the two DNA strands when they wind around each other

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5
Q

gene

A

a piece of a DNA molecule / chromosome

hundreds or thousands of nucleotides

the information to build one protein

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6
Q

genome

A

the entire set of DNA inside the nucleus (for humans, 46 chromosomes)

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7
Q

karyotype

A

a medical test which looks at all your chromosomes to see if they look healthy

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8
Q

DNA replication

A

takes place in the nucleus

builds new strands of DNA against the old strands

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9
Q

helicase

A

an enzyme which unwinds the DNA double helix

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10
Q

DNA polymerase

A

an enzyme which builds the new DNA strand against the old DNA strand

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11
Q

Cell cycle

A

The stages a cell goes through before dividing: G1, S, G2, M

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12
Q

interphase

A

the time in which the cell functions, grows, and builds new parts before dividing

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13
Q

prophase

A

the DNA condenses into chromosomes (X shaped)

the nucleus dissolves

the spindle starts to form

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14
Q

metaphase

A

The chromosomes line up at the cell’s equator

the spindle is fully formed

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15
Q

anaphase

A

The spindle contracts, pulling apart the chromosomes. The sister chromatids move towards opposite ends of the cell.

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16
Q

telophase

A

Two nuclei begin to form, at opposite ends of the cell. The spindle starts to break down.

17
Q

cytokinesis

A

the cell divides into two daughter cells

18
Q
A

many chromosomes

the genome

19
Q
A

the cell cycle

20
Q
A

one chromosome

containing replicated DNA (2 sister chromatids)

21
Q
A

Karyotype