1. Paramecium has both a macronucleus and a micronucleus. What is the function of each of...

1. Paramecium has both a macronucleus and a micronucleus. What is the function of each of these structures? Which one is involved in reproduction? What are the different methods of reproduction that Paramecium can use?

2. The geometric appearance of diatoms is caused by what structural compound? What are some of the commercial applications for diatoms?

3. Explain why Volvox might be considered plant-like.

Expert Solution

1. The macronucleus controls the non reproductive functions. It expresses the genes needed for daily functioning. The organism cannot survive without the macronucleus. Macronucleus acts as the center of all metabolic activities of the organism.

The micronucleus is the storage site for the germline genetic material for the organism. It gives rise to the macronucleus. It is also responsible for genetic reorganization that occurs during conjugation.

Micronucleus is involved in reproduction.

Paramecium can udergo reproduction either by sexual method or by asexual methods. Asexual mode is the primary method of reproduction. It occurs by means of binary fission.

Sexual reproduction only occurs under stress conditions by means of conjugation.

2. The cell wall of diatoms is made up of hard, brittle silica which is partially hydrated and non crystalline. The silica shell of diatoms is made up of two halves each in turn composed of several different pieces. This gives rise to the geometric appearance of diatoms.

Commercial uses of diatoms:

Diatoms are used in filters.

Thye are used as pest repellants.

They are used in toothpastes.

They used to polish metals.

They are used as indicator species.

3. Volvox might be considered plant like because it performs photosynthesis.

gladiator answered 1 year ago

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