Question

choose two essays and answer using the space provided. 41. describe the functions of the nuclear envelope, chromatin, and nucleolus. 42. what is the difference between an electron microscope and a compound microscope? 43. between which cell types is the difference greater - plant and animal cells or prokaryotic and eukaryotic cells? give reasons for your answer.

Explanation:

1. Question 41: The nuclear envelope protects the nucleus, chromatin contains genetic material and is involved in gene - expression regulation, and the nucleolus is involved in ribosome synthesis.
2. Question 42: An electron microscope uses a beam of electrons to form an image and has a much higher resolution than a compound microscope which uses light.
3. Question 43: The difference is greater between prokaryotic and eukaryotic cells. Prokaryotes lack a nucleus and membrane - bound organelles, while eukaryotes have a nucleus and various membrane - bound organelles. Plant and animal cells are both eukaryotic and have more similarities such as a nucleus and many common organelles.

Answer:

1. For Question 41: The nuclear envelope separates the nucleus from the cytoplasm, protecting the genetic material. Chromatin packages DNA and is involved in regulating gene expression. The nucleolus is the site of ribosome subunit synthesis.
2. For Question 42: An electron microscope uses electrons to generate an image, offering higher resolution (up to 0.2 nm) and can view very small structures like viruses and cell organelle details. A compound microscope uses light, has lower resolution (around 0.2 μm) and is used for viewing larger cells and tissues.
3. For Question 43: The difference is greater between prokaryotic and eukaryotic cells. Prokaryotes lack a true nucleus and membrane - bound organelles, have a single circular chromosome, and are generally smaller. Eukaryotes have a defined nucleus, multiple linear chromosomes, and various membrane - bound organelles. Plant and animal cells, being eukaryotic, share many features like a nucleus, mitochondria, etc., and mainly differ in cell - wall presence (plant cells have it, animal cells don't) and some organelles like chloroplasts (in plant cells).