Question 1:

Let’s break this down:

• Stem cells are cells that can divide and give rise to different cell types.

• They are not yet specialized (i.e., not differentiated into a specific type like skin or muscle).

• This means they are undifferentiated cells.

• Stem cells are found in many organisms, not just in plant stems or only in human embryos.

Correct answer: B. undifferentiated.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 2:

Let’s check each statement.

• A. Stem cells divide by mitosis — True. Stem cells divide via mitosis to produce new cells.

• B. Stem cells have the potential to divide many times — True. This is a key property of stem cells (self-renewal).

• C. Stem cells divide by meiosis — False. Meiosis produces gametes (sperm and egg cells), not stem cell division for growth or repair.

• D. Stem cells are found in the bone marrow of adult humans — True. Adult bone marrow contains hematopoietic stem cells.

So, the statement that is not true is:

C. Stem cells divide by meiosis.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 3:

Let's examine each option:

• A. They have the potential to divide — True, but this is true of many stem cells, not unique to embryonic stem cells (ESCs).

• B. They are easy to grow and culture in a laboratory — True relative to many other cell types, and ESCs can be maintained in culture for many divisions.

• C. The stem cells can be stimulated to differentiate into specialised cells — True — this is one of their main scientific and medical advantages: pluripotency.

• D. All of the above — Since A, B, and C are all true statements about human embryonic stem cells, and together these properties are why they are so useful, this is the correct comprehensive answer.

D. All of the above is the correct choice.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 4:

The correct answer is D. Plasma.

Here’s why:

• Plasma is the liquid component of blood (mostly water, with dissolved proteins, ions, nutrients, and waste products). It is not a blood cell; it is the extracellular matrix in which blood cells are suspended.

• Red blood cells (erythrocytes) are blood cells.

• Lymphocytes are a type of white blood cell (leukocyte), so they are blood cells.

• Phagocytes (such as neutrophils and macrophages) are also types of white blood cells, hence blood cells.

So the option that is not a blood cell is D. Plasma.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 5:

To answer this, let’s think about what happens in a bone marrow transplant:

1. Stem cells in the bone marrow divide to produce new blood cells.

2. Stem cells divide by mitosis, not meiosis (meiosis is for making gametes).

3. When stem cells divide, they can either:

   • Stay the same (self-renewal), or

   • Differentiate into specialized blood cells (red blood cells, white blood cells, platelets).

The question says: "To produce new blood cells the stem cells must:" — This means they must first divide and then produce new types of blood cells, which is differentiation.

So:

• Divide by mitosis

• Produce new types by differentiation

That matches option C.

Answer: C

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 6:

The correct answer is:

A. The recipient might reject the donor cells

Explanation:

• The recipient’s immune system recognizes the donor stem cells as foreign (unless they come from an identical twin).

• To prevent graft rejection, immunosuppressive drugs are given so the immune system does not attack the transplanted stem cells.

• B, C, and D are not the primary reasons for giving immunosuppressive drugs in this context.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 7:

The correct answer is:

B. Meristematic

Explanation:

• Meristematic tissue in plants is composed of undifferentiated cells capable of division — these are the plant stem cells.

• They are found in regions like the tips of roots and shoots (apical meristems) and in vascular cambium.

• Spongy mesophyll, epidermis, and xylem are already differentiated tissues that perform specific functions (photosynthesis, protection, water transport) and do not contain stem cells.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 8:

Let's evaluate each option:

• A. Viral diseases may be spread through a crop — This is a disadvantage or risk, not an advantage. If you clone plants from infected stem cells, the virus can spread to all clones.

• B. Rare plant species can be prevented from becoming extinct — This is an advantage.

• C. Crop plants with disease resistance can be cloned to produce large numbers of identical plants for farmers — This is an advantage.

• D. New varieties of plant can be cloned and commercially developed — This is an advantage.

The question asks: "Which of the following is not an advantage?"

The correct answer is:

A. Viral diseases may be spread through a crop

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 9:

Let’s compare plant and human stem cells:

• Plants — Stem cells are found in meristems (apical and lateral), and they continue to divide and differentiate throughout the plant’s life (indeterminate growth).
  So: “Cells can divide and differentiate throughout a plant’s life” is correct for plants.

• Humans — Most cells do not divide and differentiate throughout life; only certain stem cells do.

  • Embryonic stem cells are pluripotent (can become any cell type).

  • Adult stem cells are multipotent or unipotent and can only differentiate into limited cell types.
    So: “Only embryonic stem cells can divide and differentiate into any type of cell” is correct for humans.

That matches option B:

Plants: Cells can divide and differentiate throughout a plant’s life
Humans: Only embryonic stem cells can divide and differentiate into any type of cell

Answer: B

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 10:

The correct answer is:

B. unethical

Explanation:

• The main controversy surrounding stem cell research, particularly with human embryonic stem cells, is that obtaining them involves destroying the embryo.

• Many people and some countries consider this morally or ethically wrong, leading to bans or restrictions.

• The reasons “too complicated,” “too expensive,” or “too risky” are not the primary ethical objections behind such bans.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.