Unit 2 Flashcards

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1
Q

Zygote

A

Fertilized egg

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2
Q

What happens when the sperm goes inside the egg?

A

the zygote (fertilized egg) goes through cell division repeatedly.

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3
Q

Cell division through mitosis gives rise to what?

A

Many identical cells

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4
Q

Differentiation

A

a process that creates special structures and functions

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5
Q

Specialized cells become

A

tissues -> organs -> organ systems

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6
Q

stem cells

A

undifferentiated cells that become differentiated into one or more types of specialized cells

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7
Q

Embryonic Stem Cells

A

cells that haven never differentiated

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8
Q

Adult stem cells

A

cells found in adult bone marrow that are partially differentiated and can become bone, blood, cartilage, fat, and connective tissue

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9
Q

implanted blastocyst becomes gastrula:

A

embryo with three differentiated germ levels

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10
Q

Organogenesis

A

the process of body organ and organ system formation that follows gastrulation (folding of the cell)

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11
Q

organism

A

one individual member of a species: a living thing

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12
Q

organ system

A

set of organs working together for a common function

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13
Q

organ

A

set of tissues working together for a common function

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14
Q

tissue

A

group of cells working together for a common function

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15
Q

cell

A

most basic unit of life that has all the characteristic of life

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16
Q

cell cycle

A

a repeated pattern of growth, DNA duplication and cell division that occurs in eukaryotic cells

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17
Q

2 purposes in cell division

A

growth and repair

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18
Q

Interphase

A

the growth phase of the cell

G1: Gap 1 Phase: cell grows and makes proteins

S: Synthesis Phase: DNA Replication occurs, doubling the number of chromosomes

G2: Gap 2 Phase: more cell growth and protein synthesis

19
Q

Chromosome

A

one long continuous thread of DNA that consists of thousands of genes and regulatory information

20
Q

Gene

A

a section of DNA that contains the instructions for making a protein

21
Q

In normal body cells, chromosomes always occur in in pair of _______ chromosomes

A

homologus

22
Q

Homologus Chromosome

A

———– |
| |
| ———– |
| |
| ———– |
(next to eachother)
| ———– |
| |
| ———– |
| |
| ———– |

23
Q

Chromatif

A

one half of a duplicated chromosome

24
Q

Sister Chromatids

A

two identical Chromatids

know drawing

25
Q

Centromere

A

region of the condensed chromosomes that look pinched

26
Q

telomere

A

ends of the DNA molecule’s

27
Q

X crossed chromosomes

A

duplicated

28
Q

mitosis

A

the division phase of the cell cycle

29
Q

in mitosis 1 cell becomes ….

A

2 identical daughter cells

30
Q

Ptophase

A

-chromosomes condense and become sister chromatids (in X’s)
-nuclear membrane disappears
-spindle fibers form out of centrioles
-know drawing

31
Q

Metaphase

A

-spindle fibers connect to the centromere of each sister chromatid
-chromosomes line up in the middle of the cell

32
Q

Anaphase

A

-sister chromatids separate, pulling away from each other and becoming individual chromosomes
-chromatids move to opposite ends of the cell

33
Q

Telophase

A

-chromosomes decondense and start to look like chromatin again
-nuclear membrane reforms around chromosomes at each pole
-spindle fibers break down
-cytokinesis begins at the end of telophase

34
Q

Cytokenesis

A

the division of the cytoplasm into 2 individual cells
END RESULT: 2 identical body cells

35
Q

Differentiate between cytokinesis in plant and animal cells

A

In plant cells- cell plate forms midway between divided nuclei and gradually develops into a cell wall.

In animal cells- forms cleavage furrows that pinches the cell into two equal parts

36
Q

I-PMAT-C

A

interphase-prophase, metaphase, anaphase, telophase-cytokenesis

37
Q

how often do cells divide?

A

every cell divide at a different rate based on its need

38
Q

How do body cells divide?

A

they must stay small to maintain a high surface area to volume ratio
smaller cells are more efficiant tgan larger cells

39
Q

How do body cells divide?

A

they must stay small to maintain a high surface area to volume ratio
smaller cells are more efficient than larger cells

40
Q

What is the cell cycle controlled by?

A

Chemical reactions control system that starts & stops the cell cycle (proteins play a key role in this)

41
Q

External signals -

A

signals that come from outside of the cell
Ex. Hormones, Nutrients, etc.

42
Q

Internal signals -

A

signals that come from the cell’s own nucleus Ex. DNA inside the cell

43
Q

Checkpoints

A

critical points where “stop” and “go” signals regulate the cycle

44
Q

cell division is mostly in the ____ position in animal cells because there is no stimulus present

A

stop