Which structure is the arrow pointing to and what is the function of this organelle?
Answer: The arrow is pointing to the nucleus . The function of this organelle that it controls the activities of the cells .
Which organelle is the A pointing to?
Section 7.2 Organelle ID (Extra credit opportunity)
| A | B |
|---|---|
| Which organelle is shown in this micrograph?, | a mitochondrion, |
| Which cellular structure are the question marks referring to?, | nuclear pore, |
| What is “A” pointing to?, | rough endoplasmic reticulum, |
| What is “B” pointing to?, | free ribosomes, |
What are the green organelles that the arrow is pointing to called?
The chloroplasts contain a green pigment called chlorophyll, which captures the light energy that drives the reactions of photosynthesis. Like plant cells, photosynthetic protists also have chloroplasts. Some bacteria perform photosynthesis, but their chlorophyll is not relegated to an organelle.
What function does a nucleus have?
The nucleus controls and regulates the activities of the cell (e.g., growth and metabolism) and carries the genes, structures that contain the hereditary information.
Why is the nucleus so important?
The nucleus is considered to be one of the most important structures of eukaryotic cells as it serves the function of information storage, retrieval and duplication of genetic information. It is a double membrane-bound organelle that harbours the genetic material in the form of chromatin.
What is the nucleus and why is it important?
The nucleus is one of the most obvious parts of the cell when you look at a picture of the cell. It’s in the middle of the cell, and the nucleus contains all of the cell’s chromosomes, which encode the genetic material. So this is really an important part of the cell to protect.
What would happen without the nucleus?
Without nucleus the cell will lose its control. It can not carry out cellular reproduction. Also, the cell will not know what to do and there would be no cell division. Gradually, the cell may die.
What is the most important cell in the human body?
Red blood cells
What type of cell is a human?
Adult (or somatic) stem cells are present throughout the human body [amongst other specialised tissue cells]. They exist in order to repair and maintain surrounding specialised tissues. As these cells are unspecialised, stem cell anatomy is that of a simple cell.
Why the cell is very important for us?
cells are basic building blocks of all living things the human body is composed of trillions of cells they provide structure for the body take in nutrients from food convert those nutrients into energy and carry out specialised functions.
How many human cells are in the human body?
Based on an adult man’s typical volume, you might conclude that the human body contains 15 trillion cells.
Does body change every 7 years?
The human body is constantly renewing itself. It’s a beautiful idea, when you think about it: You can leave the old you behind and become a completely new person every seven years. Unfortunately, it’s just not true.
What cell has the shortest lifespan?
Probably neutrophils (granulocytes) have the shortest lifespan of human cells, 4 hours or less. Neutrophils make up about 55–70% of our white blood cells. They are the part of our white blood cells that fight bacterial infections.
Which cell has the longest lifespan?
What cells in the human body live the longest?
- Brain cells: 200+ years?
- Eye lens cells: Lifetime.
- Egg cells: 50 years.
- Heart muscle cells: 40 years.
- Intestinal cells (excluding lining): 15.9 years.
- Skeletal muscle cells: 15.1 years.
- Fat cells: 8 years.
- Hematopoietic stem cells: 5 years.
What are the fastest growing cells in the human body?
Hair follicles, skin, and the cells that line the gastrointestinal tract are some of the fastest growing cells in the human body, and therefore are most sensitive to the effects of chemotherapy.
Which part of body never grows?
Eyes (cornea) never grow from birth till death because of absence of blood supply.
What stops cells from growing?
In the absence of sugar, TORC1s assemble into a tubular structure, rendering them inactive and thus cell growth stops. TORC1 is an enzyme complex that controls the normal growth of our cells; but, when too active, it can promote diseases such as cancer.