Chapter 3

Question 0

How do Unicellular organisms reproduce

Answer 0

through cell division.

Question 1

When does most growth in multicellular organisms occur

Answer 1

when cells dividing produce new cells.

Question 2

How do multicellular organisms reproduce?

Answer 2

cell division is involved in growth, development, and reproduction.

Question 3

The genetic material of eukaryotic cells is organized in

Answer 3

chromosomes

Question 4

The genetic material of a cell contains information needed for

Answer 4

the cell’s growth and other activities

Question 5

What happens When a cell divides into two new cells,

Answer 5

each new cell receives a full set of genetic material

Question 6

The genetic material in cells is contained where?

Answer 6

in DNA molecules

Question 7

What is DNA

Answer 7

deoxyribonucleic acid

It is the genetic material in cells.
And is a chemical that contains information for an organism’s growth and functions.

Question 8

James Watson and Francis Crick showed that DNA is made of what?

Answer 8

two strands of molecules joined in a structure that resembles a twisted ladder or a double helix.

Question 9

In a eukaryotic cell, where is most of the cells DNA found?

Answer 9

in the nucleus and exists as a mass of loose strands.

Question 10

DNA is wrapped around what?

Answer 10

proteins like threads that wrap around a spool and compacted into structures called chromosomes.

Question 11

During division, a duplicated chromosome can be seen as two identical structures called

Answer 11

chromatids that are held together by a centromere

Question 12

Humans have how many chromosomes,

Answer 12

46

Question 13

fruit flies has how many chromosomes

Answer 13

8

Question 14

corn plants has how many chromosome

Answer 14

20

Question 15

What happens When an organism ages or is injured?

Answer 15

the worn-out or damaged cells are replaced by new cells forming from healthy cells dividing

Question 16

What is the limits to the size that cells can reach.

Answer 16

It’s related to the control of cell division.

When the cell divide into two smaller cells, the ratio of surface area to volume for each cell increases.

Question 17

What happens through cell division and development?

Answer 17

cells become specialized to perform particular functions.

Question 18

The body repairs injuries by means of

Answer 18

cell division

Question 19

The human body is made up of about how many different types of cells

Answer 19

200

Question 20

What is a cycle?

Answer 20

A cycle is an activity or set of event that regularly repeats.

Question 21

The cell cycle includes what?

Answer 21

interphase and cell division.

Question 22

Life cycle

Answer 22

The process in which All living things live, grow, reproduce and die

Question 23

cell cycle

Answer 23

the normal sequence of development and division of a cell.

Question 24

What are The cell cycle two main phases

Answer 24

1- interphase- in which the cell carries out its functions, 2- the cell divides, which can include mitosis and cytokinesis.

Question 25

eukaryotes undergo what?

Answer 25

mitosis

Question 26

Interphase

Answer 26

The part of the cell cycle during which a cell is not dividing.

Question 27

What activities takes place During interphase,

Answer 27

the cell grows to about twice the size The cell transports materials in and transporting wastes out. Also, cellular respiration occurs, which provides the energy the cell needs.

Question 28

Before a cell can divide what must occur

Answer 28

The cell must duplicates its DNA exactly to ensures that, after cell division, each new cell gets a complete set of DNA.

Question 29

Mitosis

Answer 29

is the part of the cell cycle during which the nucleus divides.

Question 30

Why don't Prokaryotes do not undergo mitosis

Answer 30

because they have no nucleus.

Question 31

What Is The function of mitosis

Answer 31

to move the DNA and other material in the parent cell into position for cell division.

Question 32

Cytokinesis

Answer 32

the division of the parent cell’s cytoplasm, and occurs immediately after mitosis.

Question 33

Daughter cell

Answer 33

A result of mitosis and cytokinesis, the original cell splits into two genetically identical daughter Each daughter cell receives a complete set of DNA from the parent cell.

Question 34

What do new cells do?

Answer 34

New cells help your body grow, develop, repair itself and replace worn-out parts.

Question 35

Mitosis has how many phases

Answer 35

4

Question 36

Phase 1. Chromosomes form.

Answer 36

the DNA in the nucleus of a cell condenses and becomes visible under a light microscope. Each chromosome consists of two identical chromatids held together by a centromere. The membrane around the nucleus disappears.

Question 37

Phase 2 metaphase

Answer 37

The chromosomes line up in the middle of the cell.

Question 38

Phase 3- anaphase

Answer 38

Chromosomes separate. the chromatids split, resulting in two separate identical chromosomes. These chromosomes are pulled to opposite sides of the cell.

Question 39

Phase 4 telophase

Answer 39

A new nuclear membrane forms around each group of chromosomes. The chromosomes return to their threadlike form. the parent cell’s cytoplasm is divided to complete the parent cell’s division into two entirely separate daughter cells.

Question 40

What is Cytokinesis

Answer 40

the division of the parent cell’s cytoplasm, Cytokinesis differs slightly in animal cells and plant cells.

Question 41

What happens during cytokinesis in an animal cell?

Answer 41

the cell wall prevents the cell membrane from being pulled inward. A structure called a cell plate grows between the two nuclei. The cell plate develops into a membrane an eventually becomes part of the new cells. Forming 2 completely separate daughter cells