PRACTICE TEST
    Chap 8 (8-1 & 8-2)

1. The 2 chromatid arms are held together in the center
by a _______________.

        centrosome    centriole     centromere    histone

2. A cell with only one of each kind of chromosome is said to be 1n or _____________

3.  An example of the cell described above would be a
   ________________

4. All human body cells (except red blood cells) have _____ chromosomes.

                    23            46             72           18

5. Which of the following shows the correct order for the phases of the cell cycle?

        G₁ -   G₂   -  S    - M

        S   -   G₁   -  M   -  G₂

        G₁  -  S  -   G2  -   M

        G1   - M   -  G₂   - S    

6. Phase of mitosis in which we see 2 nuclei, the DNA spreads out into chromatin, and the nuclear membrane and nucleolus return.

7. The diagram above shows a picture of an organism's chromosomes called a _______________________.

8. The person above is a   ____________   male   OR    female

9. Cells spend most of their lifetime in this phase of the cell cycle.

  
10. Phase of the cell cycle where chromosomes line up in the middle of the cell.

11.  During prophase _______________________
            A.   chromosomes begin to move apart
            B.  the DNA changes from chromosomes to chromatin
            C.  cells copy their DNA
            D.  the nuclear membrane disappears and DNA scrunches into chromosomes

 
 
12.  This cell is in ________________

13. Name one of the reasons cells divide.

14. Cells  that have stopped dividing all together are in______ phase.

15. The division of the cytoplasm at the end of mitosis is called _________________.

16. This place where the cell membrane pinches in to make two new cells is called a ____________________________

17. Phase of mitosis that follows prophase.

18. This cell above is a ______________ cell

            plant           animal           bacteria

19. What structure can you see in the picture above that makes you think so?

20. The 2 chromosomes that have the same size, same shape, and carry genes for the same traits are called ________________ chromosomes.

21. DNA that is spread out in an interphase nucleus is called __________________.

22. Structures at the poles in a dividing cell which attach to the spindle fibers and pull the chromosomes.

23. The spot on the centromere where the spindle fibers attach is called the __________________.

24.  The phase in the cell cycle that follows S in a dividing cell.

25. Name the phases of mitosis in order starting with prophase.

26.  A person with 2 X chromosomes is a ________________.

27.  Type of cell division which produces cells with 1/2 the number of chromosomes as the parent cell.

28.  Proteins that control the turning on and off of certain genes are called ____________________.

29.  The 44 human chromosomes that are NOT SEX CHROMOSOMES are called _______________________.

30. First dividing phase where we see chromosomes.

CHECK ANSWERS

ANSWERS
1. centromere
2. haploid
3. sperm or egg
4. 46 (23 pairs)
5. G₁  -  S  -   G₂  -   M
6. telophase
7. karyotype
8. male
9. interphase
10. metaphase
11. D; nuclear membrane disappears and DNA scrunches
12. anaphase
13. Reproduction in single cell organisms
      Growth of organism
      repair injured cells
      replace worn out cells
     
14. G₀
15. cytokinesis
16. cleavage furrow
17. metaphase
18. plant
19. cell plate forming in middle
20. homologous
21. chromatin
22. centrioles
23.  kinetochore
24.  G₂
25. prophase, metaphase, anaphase, telophase, cytokinesis
26. female (girl)
27.  meiosis
28.  non-histones
29.  autosomes
30.  prophase