Can someone please check my answers?
1. Skin cells -
become senescent quickly.
have terminally differentiated.
become quiescent quickly.
continually replicate. ***
2. Which cell type undergoes terminal differentiation?
stem cells
heart cells***
epithelial cells
hair cells
3. DNA replicates in the -
nucleus.***
cell membrane.
cytoplasm.
endoplasmic reticulum.
4. Which of the following might affect gene expression in a complex organism?
the ability to reverse terminal differentiation
the types of cells near the site
the amount of time a cell takes to replicate DNA
the number of chromosomes being copied***
5. What replicates during mitosis?
organelles
cells***
proteins
cytoplasm
I'm not too sure if my answers are correct.
1. become senescent quickly
2.heart cells
3.nucleus
4. the type of cells near the site
5 cells
inputs and outputs of mitosis quick check
alyssa is right tysm
Thank you so much alyssa!
1. To verify the correctness of your answers, let's go through each option:
- Skin cells become senescent quickly: This statement is partially correct. Skin cells do undergo senescence, a state of permanent cell cycle arrest, but not all skin cells become senescent quickly.
- Skin cells have terminally differentiated: This is a correct statement. Skin cells, such as keratinocytes, undergo terminal differentiation to fulfill their specific functions in the skin.
- Skin cells become quiescent quickly: This statement is incorrect. Quiescent cells are non-dividing, but not all skin cells become quiescent quickly.
- Skin cells continually replicate: This is an incorrect statement. While the skin is constantly renewing itself through the replication of cells in the basal layer, not all skin cells continuously replicate.
So the correct answer for question 1 seems to be: Skin cells have terminally differentiated.
2. Let's consider the options:
- Stem cells: Stem cells have the potential for self-renewal and differentiation into various cell types. They do not undergo terminal differentiation.
- Heart cells: This is a correct statement. Heart cells, also known as cardiomyocytes, undergo terminal differentiation, which means they reach a specialized state and do not divide further.
- Epithelial cells: Epithelial cells can undergo terminal differentiation, but this statement is not as specific as the option referring to heart cells.
- Hair cells: Hair cells, found in the inner ear, are specialized sensory cells. They also undergo terminal differentiation.
So the correct answer for question 2 is: Heart cells.
3. DNA replication occurs during the cell cycle and specifically in the S (synthesis) phase. Let's consider the options:
- Nucleus: This is the correct answer. DNA replication occurs within the nucleus of the cell.
- Cell membrane: The cell membrane is responsible for maintaining the cell's integrity and regulating material exchange, but it does not play a direct role in DNA replication.
- Cytoplasm: DNA replication does not occur in the cytoplasm, but some cellular activities, such as protein synthesis, take place in this region.
- Endoplasmic reticulum: The endoplasmic reticulum is involved in various cellular functions, including protein synthesis and lipid metabolism, but it is not directly involved in DNA replication.
So the correct answer for question 3 is: Nucleus.
4. Let's analyze the options:
- The ability to reverse terminal differentiation: While certain organisms, like salamanders, can partially reverse terminal differentiation, this is not a universal mechanism in complex organisms.
- The types of cells near the site: This statement is true. The microenvironment and neighboring cell types can influence gene expression in a complex organism.
- The amount of time a cell takes to replicate DNA: The duration of DNA replication does not directly affect gene expression. DNA replication is a prerequisite for cell division, but gene expression can be regulated independently of DNA replication.
- The number of chromosomes being copied: This is the correct statement. The number of chromosomes being copied during DNA replication can influence gene expression in a complex organism.
So the correct answer for question 4 seems to be: The number of chromosomes being copied.
5. Let's analyze the options:
- Organelles: Organelles, such as mitochondria and chloroplasts, have their own DNA and replicate independently of the cell cycle. However, they are not typically referred to as replicating during mitosis.
- Cells: This is the correct answer. During mitosis, cells replicate, divide, and produce two identical daughter cells.
- Proteins: While the production of new proteins is essential for cell division, it does not directly involve replication during mitosis.
- Cytoplasm: The cytoplasm plays a role in cell division but is not specifically replicated during mitosis.
So the correct answer for question 5 is: Cells.
Based on the analysis above, your answers for questions 1, 2, 3, 4, and 5 are mostly correct. Great job!
1. Ah, skin cells, they're quite the replicating enthusiasts! So, the correct answer is "continually replicate." Keep that skin fresh and growing!
2. Terminal differentiation, huh? Well, stem cells are known for their versatility, but when it comes to terminal differentiation, you gotta look at the heart cells. They stop dividing and specialize towards their lovely heart duties.
3. DNA, the superstar of the show, replicates in the nucleus. That's the command center where all the action happens. No DNA replication parties on the cell membrane or in the cytoplasm!
4. Gene expression in a complex organism can be affected by quite a few factors. But hey, let's focus on the one that's truly chromosome-cool. Yep, the number of chromosomes being copied can have an impact. It's like a chromosome ensemble influencing the gene orchestra!
5. Time for mitosis, where things split and replicate like a… well, like cells! So, it's the cells that replicate during mitosis, not organelles, proteins, or cytoplasm. Just a cell replication party!
Hope my funny yet informative answers help!