The centrosome is present outside the nucleus in an animal cell. It is the structure that contains centrioles. These are the structures that are essential during cell division. The plant cells lack centrioles and are able to divide in their absence.
Further Explanation:
The centrioles are present particularly in animal cells and are located within the centrosome which is present near the nucleus. The centrosome is a granular mass that acts as a center for microtubules. The centrioles are two in numbers and are positioned at the right angle with respect to each other. Each centriole is composed of microtubules forming nine bundles that are arranged in a ring formation.
In an animal cell during interphase, the components of the centrosome along with the centrioles are doubled. Initially, the duplicated pairs of centrioles remain close to each other but with the initiation of mitosis, the pairs tend to separate and get located in the newly formed microtubule-organizing centers. The microtubules are radiated through these centers in the star-shaped clusters called asters. With the movement of asters towards the opposite poles, the microtubules span the cell attaining a spindle-shaped formation. The spindle fibers help in the alignment of chromosomes during their separation at the time of cell division.
In animal cells, centrioles are important for mitosis to take place whereas reproduction in plant cells can occur even without centrioles. The presence of centrioles in animal cells has made mitosis an efficient and error-free process while its absence results in divisional errors and also delays the mitotic process.
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Answer Details:
Grade: High School
Chapter: The Cell
Subject: Biology
Keywords:
Cell, centrosome, centriole, granular mass, microtubules, interphase, duplication, cell division, mitosis, spindle formation, asters, microtubule organizing center, chromosomes, reproduction, animal cell, plant cell.
Answer:
1. growth
2.causes biochemical reactions
3. acts as a chemical messenger that aids communication between your cells, tissues and organs.
4. provides structure
5.maintains proper pH
6. balances fluids in the body.
7.boosts immune health
8. transports and stores nutrients
9. provides energy for you body
Explanation:
b. bear, badger, fox, human, and rat.
c. aardvark, whale, hyena, dog, dolphin, and mole.
d. giraffe, deer, elk, walrus, human, and rat
Answer:
ITS AAAA
Explanation:
B) the long arm of a chromosome
B. An oak tree grows from the seed material in an acorn.
C. Water drips from underneath an oak tree leaf in the morning.
D. Sediment from an area where oak trees were cut down builds up alongside a stream
The example that demonstrates that all cells come from pre-existing cells is an oak tree grows from the seed material in an acorn (option B).
The cell theory is the scientific theory that all living organisms are made of cells as the smallest functional unit.
One of the components of the cell theory is that all cells come from already existing cells i.e. new cells form from cells that are already in existence in a process of reproduction.
The example of this is a tree that grow from a germinating seed. Hence, option B is correct.
Learn more about cell theory at: brainly.com/question/1468725
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