Crossword

1 M

E

2 I

O

S

I

S

3 A

N

A

4 P

H

A

S

E

N

R

5 M

E

T

A

B

O

L

I

S

M

O

6 D

E

P

I

7 M

8 C

H

R

O

M

O

S

O

M

E

9 H

A

P

L

O

I

D

P

A

L

T

H

S

O

O

10 A

C

T

I

V

E

S

I

T

E

I

S

S

D

I

11 C

E

N

12 T

R

O

M

E

R

E

S

E

13 B

14 C

A

T

A

L

Y

S

T

I

O

V

15 M

E

T

A

P

H

A

16 S

E

17 Z

A

H

P

Y

L

A

H

18 G

A

M

E

T

E

19 S

U

B

S

T

R

A

T

E

O

N

E

S

T

T

20 E

N

Z

Y

M

E

Across:
1	A specialized process of cell division in eukaryotes during which diploid cells divide to produce haploid cells. ____ has two division cycles and occurs exclusively in cells that produce gametes.
3	The stage of mitosis during which sister chromatids separate and move to opposite poles of the cell.
5	All the chemical reactions that occur in a cell.
8	Any of several elongated structures found in the nucleus of a cell, each composed of DNA packaged with proteins. ____s become visible under the microscope during mitosis and meiosis.
9	Of or referring to a cell or organism that has only one complete set of homologous chromosomes (n).
10	(two words, no space) The specific region on the surface of an enzyme where substrate molecules bind.
11	A physical constriction that holds sister chromatids together.
14	A molecule that speeds up a specific chemical reaction without being consumed in the process. Enzymes are protein catalysts.
15	The stage of mitosis during which chromosomes become aligned at the equator of the cell.
18	A haploid sex cell, which fuses with another sex cell during fertilization. Eggs and sperm are ____s.
19	The specific molecule on which an enzyme acts. Only the ____ will bind to the active site of the enzyme.
20	A protein that acts as a catalyst, speeding the progress of chemical reactions. All chemical reactions in living organisms are catalyzed by ____s.

Down:
2	The period of time between two successive mitotic divisions, during which most of the preparations for cell division occur.
4	The stage of mitosis during which chromosomes first become visible under the microscope.
6	Of or referring to a cell or organism that has two complete sets of homologous chromosomes (2n).
7	The process of cell division in eukaryotes that produces two daughter nuclei, each with the same chromosome number as the parent nucleus.
12	The stage of mitosis during which chromosomes arrive at the opposite poles of the cell and new nuclear envelopes begin to form around each set of chromosomes.
13	A pair of homologous chromosomes. Bivalents form during prophase I of meiosis.
16	(two words, no space) The stage of the cell division cycle during which the cell's DNA is replicated.
17	The diploid cell formed by the fusion of two haploid gametes; a fertilized egg.