The Cell (PPT based) Part IV

Question 1

also known as the gap phase

Answer 1

G2 phase

Question 2

follows the S phase and extends to mitosis

Answer 2

G2 phase

Question 3

lasts 2-4 hours

Answer 3

G2 phase

Question 4

cell prepares to divide

Answer 4

G2 phase

Question 5

centrioles grow to maturity

Answer 5

G2 phase

Question 6

energy required for the completion of mitosis is stored

Answer 6

G2 phase

Question 7

RNA and proteins necessary for mitosis are synthesized

Answer 7

G2 phase

Question 8

follows the G2 phase

Answer 8

Mitosis

Question 9

completes the cell cycle

Answer 9

Mitosis

Question 10

involves Karyokinesis and Cytokinesis

Answer 10

Mitosis

Question 11

division of the nucleus

Answer 11

Karyokinesis

Question 12

division of the cytoplasm resulting in the production of two identical daughter cell

Answer 12

Cytokinesis

Question 13

last 1-3 hours

Answer 13

Mitosis

Question 14

4 major stages of Mitosis:

Answer 14

prophase
metaphase
anaphase
telophase

Question 15

chromosomes condensed and become rod-like

Answer 15

Prophase

Question 16

centrioles are forming asters

Answer 16

Prophase

Question 17

nucleus and nuclear envelope disappear

Answer 17

Prophase

Question 18

condensed chromosomes are aligned at the equatorial plate of the mitotic spindle

Answer 18

Metaphase

Question 19

chromatids separate at the centromere

Answer 19

Anaphase

Question 20

daughter chromosomes move to opposite poles of the cell

Answer 20

Anaphase

Question 21

elongation of the spindle

Answer 21

Anaphase

Question 22

formation of a cleavage furrow

Answer 22

Anaphase

Question 23

due to contraction of a band of actin filaments called the contractile ring

Answer 23

Anaphase

Question 24

deepening of the cleavage furrow which leaves the midbody (containing overlapping polar microtubules) b/w daughter cells

Answer 24

Telophase

Question 25

facilitating the completion of cytokinesis and formation of 2 identical daughter cells

Answer 25

Telophase

Question 26

reformation of the nuclear envelope

Answer 26

Telophase

Question 27

reappearance of nucleoli

Answer 27

Telophase

Question 28

completed when daughter cells enlarged and dense chromosomes disperse in interphase

Answer 28

Telophase

Question 29

special form of cell division

Answer 29

MEIOSIS

Question 30

sex cells divide this type

Answer 30

MEIOSIS

Question 31

chromosome number is reduced from diploid (2n) to haploid (n)

Answer 31

MEIOSIS

Question 32

occurs in developing germ cells (spermatozoa and oocytes), fertilization results in diploid zygotes

Answer 32

MEIOSIS

Question 33

doubling of DNA content in S phase

Answer 33

MEIOSIS

Question 34

affected by 2 successive cell divisions that give rise to 4 haploid cells

Answer 34

MEIOSIS

Question 35

accompanied by recombination of maternal and paternal genes by crossing over and random assortment

Answer 35

MEIOSIS

Question 36

2 stages of meiosis:

Answer 36

A. Reductional division (meiosis I) B. Equatorial division (meiosis II)

Question 37

Reductional division (meiosis I):

Answer 37

1. Prophase I a) Leptotene d) Diplotene b) Zygotene e) Diakinesis c) Pachytene 2. Metaphase I 3. Anaphase I 4. Telophase I

Question 38

5 stages of Prophase I:

Answer 38

a) Leptotene b) Zygotene c) Pachytene d) Diplotene e) Diakinesis

Question 39

begins soon after completion of meiosis I

Answer 39

Equatorial division (meiosis II)

Question 40

events similar to meiosis

Answer 40

Equatorial division (meiosis II)

Question 41

occurs following interphase during which 46 chromosomes are duplicated giving the cell a 4CDNA content (total DNA content of the cell)

Answer 41

Reductional division (meiosis I)

Question 42

5 stages of Prophase I: chromatin condenses into visible chromosomes

Answer 42

Leptotene

Question 43

5 stages of Prophase I: each contains 2 chromatids joined at the centromere

Answer 43

Leptotene

Question 44

5 stages of Prophase I: homologous maternal and paternal chromosomes pair and make physical contact (synapsis) via the synaptonemal complex, forming a tetrad

Answer 44

Zygotene

Question 45

5 stages of Prophase I: where chiasmata are formed

Answer 45

Pachytene

Question 46

5 stages of Prophase I: crossing over occurs

Answer 46

Pachytene

Question 47

5 stages of Prophase I: random exchange of geners b/w segments of homologous chromosomes

Answer 47

Pachytene

Question 48

5 stages of Prophase I: increasing genetic diversity

Answer 48

Pachytene

Question 49

5 stages of Prophase I: where chromosomes continue to condense

Answer 49

Diplotene

Question 50

5 stages of Prophase I: where chiasmata can be observed

Answer 50

Diplotene

Question 51

5 stages of Prophase I: indicating sites where crossing over has taken place

Answer 51

Diplotene

Question 52

5 stages of Prophase I: nucleolus disappears

Answer 52

Diakinesis

Question 53

5 stages of Prophase I: chromosomes are condensed maximally

Answer 53

Diakinesis

Question 54

5 stages of Prophase I: nuclear envelope disappears

Answer 54

Diakinesis

Question 55

begins soon after completion of meiosis I, following a brief interphase

Answer 55

EQUATORIAL DIVISION (MEIOSIS II)

Question 56

separation of sister chromatids and distribution into 4 daughter cells each containing

Answer 56

EQUATORIAL DIVISION (MEIOSIS II)