The shape of the external ear is maintained by

A. Cytokinesis:Cytokinesis is the process where the cytoplasm divides after mitosis, resulting in two separate daughter cells. It follows nuclear division but is not the division of the nucleus and DNA itself.

B. Transcription:Transcription is the process of copying genetic information from DNA into messenger RNA (mRNA). It is part of protein synthesis, not cell division.

C. Interphase:Interphase is the phase of the cell cycle where the cell grows, performs normal functions, and duplicates its DNA in preparation for division. However, it is not the stage where the nucleus and DNA actually divide.

D. Mitosis:Mitosis is the process of nuclear division where replicated chromosomes are separated into two nuclei. This ensures that each daughter cell receives an identical set of genetic material.

E. Translation:Translation is the process where ribosomes synthesize proteins using mRNA as a template. It occurs in protein production, not during nuclear or DNA division.

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.