Question

part c. the diagrams below represent the sequence (order) of events in a normal mitotic cell division (mitosis).
(a) → (b) → (c) → (d)
which diagram most likely represents stage d of this sequence?
(1) diagram of cell with two chromosomes
(2) diagram of cell with four chromosomes
(3) diagram of cell in anaphase with four chromosomes
(4) diagram of cell with four chromosomes
part d. base your answers to questions 1 and 2 on the diagram below that represents a microscopic structure observed during the process of cell division and on your knowledge of biology.
diagram of a chromosome with a and b labeled

1. letter a indicates a

(1) nucleolus
(2) ribosome
(3) centriole
(4) centromere

1. letter b indicates a

(1) centrosome
(2) spindle fiber
(3) chromatid
(4) cell plate

Explanation:

Part C

The sequence shows mitosis (cell division). Stage A is interphase (chromosomes as chromatin or uncondensed), B is prophase (chromosomes condense), C is metaphase (chromosomes align at equator). Stage D should be anaphase or telophase? Wait, looking at the options: (3) shows chromosomes moving to poles (anaphase-like) or cell dividing. Wait, the original sequence: A (interphase, 4 chromosomes), B (prophase, condensed), C (metaphase, aligned). Then D should be anaphase (chromosomes separating) or telophase (cell dividing). Option (3) has a cell with chromosomes moving to opposite ends, likely anaphase/telophase. Wait, the options: (1) 2 chromosomes (haploid? No, mitosis maintains diploid), (2) 4 chromosomes but condensed? No. (3) cell dividing with chromosomes at poles, (4) 8 chromosomes? No. Wait, mitosis: after metaphase (C), anaphase (chromosomes separate) then telophase (cell divides). So stage D should be when chromosomes are at poles and cell is dividing. Option (3) shows a cell with two parts, chromosomes at each end, so that's telophase/anaphase. So the answer is (3).

The diagram shows a chromosome structure. Letter A is at the center of the chromosome, which is the centromere. Nucleolus is in nucleus, ribosome is for protein, centriole is for spindle. Centromere holds chromatids together. So A is centromere (option 4).

Letter B is at the end of the chromatid? Wait, the diagram: B is a chromatid? Wait, the structure: chromosome has two chromatids, B is a chromatid (option 3). Centrosome is for spindle, spindle fiber is part of spindle, cell plate is in plant cell division. So B is chromatid (option 3).

Answer:

(3)

Part D - Question 1