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How do chromosomes change during cell division?

Chromosomes can be either single armed or double armed. When a cell is about to divide, a chromosome replicates its genetic material to become a double armed chromosome. A double armed chromosome has a centr...
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Answered by Freya B. • Biology tutor
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How are the lungs adapted for gas exchange?

-Large surface area to volume ratio: the lungs contain millions of microscopic air sacs called alveoli, which are the sites of gas exchange in the lungs. The large number of alveoli means that the lungs have...
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Answered by Sachin A. • Biology tutor
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Explain why multicellular organisms needs to develop a specialised exchange system and transport system, yet unicellular organisms do not

Unicellular organisms have a large surface area to volume that is one cell thick, therefore they have a short diffusion distance and are metabolically inactive. Therefore, they can obtain sufficient oxygen a...
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Answered by Deepika K. • Biology tutor
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State 3 organelles found in a Eukaryotic cell and the functions of each organelle.

The organelles present in a Eukaryotic cell and there functions are the following: The Nucleus - the nucleus controls all the cells activities, it houses the DNA. Rough Endoplasmic Reticulum - The Rough Endo...
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Answered by Katrina B. • Biology tutor
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Explain the 3 types of DNA mutation substitution?

For DNA there are 4 types of bases: A, T, C, G.A codon is made from 3 bases, and codes for either an amino acid, or a stop.Mutation substitution means that one base is replaces by another base, eg: an “A” be...
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Answered by Alisha S. • Biology tutor
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