Cytokinesis begins during_____ of mitosis.
late prophase
early anaphase
early prophase
late anaphase
The Correct Answer is D
A. late prophase: During late prophase, chromosomes condense and the mitotic spindle forms, but cytokinesis has not yet begun as the cell is still preparing for chromosome alignment.
B. early anaphase: Early anaphase involves the separation of sister chromatids toward opposite poles. Cytokinesis does not start at this point because chromosome separation is still in progress.
C. early prophase: Early prophase is the initial stage of mitosis where chromatin condenses into visible chromosomes. Cytokinesis is not initiated at this stage.
D. late anaphase: Cytokinesis begins during late anaphase, when the cell starts forming a cleavage furrow as the chromosomes near the poles. This process continues into telophase, ultimately dividing the cytoplasm into two daughter cells.
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Related Questions
Correct Answer is E
Explanation
A. bulb:The bulb is the enlarged base of the hair where active cell division occurs, producing the hair shaft, but it is not the entire oblique epithelial tube.
B. vellus:Vellus refers to fine, pale hair covering most of the body in children and adult females. It describes the type of hair, not the structure in which hair grows.
C. hair root:The hair root is the portion of the hair beneath the surface of the skin, extending from the bulb to the point where the hair emerges, but it is contained within the follicle rather than being the whole tube.
D. pilus:Pilus is a general term for a hair shaft or hair in Latin, but it does not refer specifically to the oblique epithelial tube structure that surrounds hair growth.
E. hair follicle:The hair follicle is the oblique epithelial tube that surrounds the hair root and bulb. It anchors the hair into the skin and provides the environment for hair growth and regeneration.
Correct Answer is B
Explanation
A. Mature adipose cells are highly mitotic:Mature adipocytes do not actively divide. Instead, new adipocytes are formed from precursor cells, and mature ones primarily increase in size rather than number.
B. Its primary function is to store triglycerides:Adipose tissue serves mainly as an energy reservoir by storing triglycerides. It also provides insulation, cushioning, and contributes to endocrine functions by releasing hormones like leptin.
C. Most of the cell volume is occupied by the nucleus:In adipocytes, the nucleus is pushed to the periphery of the cell by a large lipid droplet. The majority of the cell volume is taken up by stored fat, not the nucleus.
D. It is composed mostly of extracellular matrix:Unlike connective tissues such as bone or cartilage, adipose tissue has relatively little extracellular matrix. The tissue is mainly composed of densely packed fat cells.
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