Skin cells(1 point)

Question

Responses

have terminally differentiated.
have terminally differentiated.

become quiescent quickly.
become quiescent quickly.

are stem cells.
are stem cells.

become senescent quickly.

Answer 1

Skin cells can be categorized based on their function and lifecycle. Here's a brief explanation of your choices:

1. Have terminally differentiated: True. Skin cells, specifically keratinocytes, do undergo terminal differentiation as they progress through the layers of the epidermis.

2. Become quiescent quickly: Partially true. While some skin cells may enter a quiescent state, many are continuously renewing and do not become quiescent quickly.

3. Are stem cells: False. Skin cells themselves are not stem cells, although the skin does contain a population of stem cells (such as in the hair follicle and the basal layer of the epidermis).

4. Become senescent quickly: This can be context-dependent, as some skin cells can become senescent due to stress or damage, but it is not universally true for all skin cells.

So, the best answer among these options regarding skin cells is that they have terminally differentiated.

Answer 2

Which cell type undergoes terminal differentiation?(1 point)
Responses

stem cells
stem cells

hair cells
hair cells

heart cells
heart cells

epithelial cells

Answer 3

The cell type that undergoes terminal differentiation is primarily epithelial cells.

• Stem cells: These cells are undifferentiated and have the potential to become various types of cells, but they are not terminally differentiated.

• Hair cells: While they can be considered a type of epithelial cell (the cells that make up hair follicles), the term "terminal differentiation" is more broadly applicable to various epithelial cells.

• Heart cells: Cardiac muscle cells can also undergo terminal differentiation, but generally, they do not regenerate as readily as some epithelial cells.

Therefore, the most appropriate response is epithelial cells.

Answer 4

In eukaryotic cells, DNA replicates in the(1 point)
Responses

cytoplasm.
cytoplasm.

endoplasmic reticulum.
endoplasmic reticulum.

nucleus.
nucleus.

cell membrane.

Answer 5

In eukaryotic cells, DNA replicates in the nucleus.

Here's a quick breakdown of the options:

• Cytoplasm: DNA replication does not occur here in eukaryotes, although it does in prokaryotic cells.
• Endoplasmic reticulum: This organelle is involved in the synthesis of proteins and lipids, but not in DNA replication.
• Nucleus: Correct. This is where eukaryotic DNA is housed and where replication takes place.
• Cell membrane: This is a barrier surrounding the cell and does not play a role in DNA replication.

So, the correct answer is nucleus.

Answer 6

Which of the following is a function of mitosis? (1 point)
Responses

to make a cell exit the cell cycle
to make a cell exit the cell cycle

to repair damaged tissue
to repair damaged tissue

to send chemicals signals throughout the body
to send chemicals signals throughout the body

to cause a cell to grow

Answer 7

The correct function of mitosis from the provided options is to repair damaged tissue.

Here’s a brief clarification on each option:

1. To make a cell exit the cell cycle: This is incorrect. Mitosis is part of the cell cycle and is necessary for cell division.

2. To repair damaged tissue: Correct. Mitosis allows for the replacement of damaged or dead cells, contributing to tissue repair and regeneration.

3. To send chemical signals throughout the body: This is not a function of mitosis; signaling is generally mediated by hormones, neurotransmitters, and other signaling molecules, not by the process of mitosis.

4. To cause a cell to grow: While mitosis contributes to growth by increasing cell numbers, it is not specifically a function of mitosis itself, as growth also involves other processes.

Therefore, the best answer is to repair damaged tissue.

Answer 8

What replicates during mitosis?(1 point)
Responses

cytoplasm
cytoplasm

proteins
proteins

organelles
organelles

cells

Answer 9

During mitosis, the structure that replicates is cells.

Here’s a breakdown of the options:

1. Cytoplasm: While cytokinesis (the division of the cytoplasm) occurs after mitosis, cytoplasm itself does not replicate during the mitotic phase.

2. Proteins: Proteins are synthesized during the interphase of the cell cycle, but they do not replicate during mitosis.

3. Organelles: Organelles are also replicated during the interphase before mitosis begins, not during the actual mitosis process.

4. Cells: Correct. Mitosis is the process by which a single cell divides to produce two daughter cells.

Thus, the correct answer is cells.