Question 1

Which of the following best describes the correct sequence of biological organization from simplest to most complex, as shown in the provided diagram?

Accepted Answer

Cell → Tissue → Organ → Organ System → Organism

Question 2

During early embryonic development, what is the primary role of cytoplasmic determinants?

Accepted Answer

They influence gene expression in daughter cells, leading to cell specialization.

Question 3

Which process is responsible for the inward migration of cells during gastrulation, forming the primitive gut?

Accepted Answer

Invagination

Question 4

A mutation in the bicoid gene of Drosophila results in which developmental abnormality?

Accepted Answer

Absence of the anterior end and duplication of posterior structures

Question 5

Which stem cell type is capable of giving rise to all cell types of an organism, including extraembryonic tissues such as the placenta?

Accepted Answer

Totipotent stem cells

Question 6

What is the main difference between pluripotent and multipotent stem cells?

Accepted Answer

Pluripotent cells can become any cell type in the body except extraembryonic tissues, while multipotent cells are restricted to specific tissue types.

Question 7

Which germ layer gives rise to the nervous system and the epidermis?

Accepted Answer

Ectoderm

Question 8

In the process of muscle cell differentiation, what is the role of the MyoD protein?

Accepted Answer

It is a transcription factor that activates muscle-specific genes.

Question 9

Which Nobel Prize-winning discovery involved the identification of homeotic genes that control pattern formation in Drosophila?

Accepted Answer

Discovery of homeotic genes by Lewis, Nüsslein-Volhard, and Wieschaus

Question 10

A patient receives a bone marrow transplant to treat leukemia. The transplanted cells are an example of which type of stem cell?

Accepted Answer

Multipotent

Question 11

Which of the following best explains why all cells in a multicellular organism contain the same DNA but have different functions?

Accepted Answer

Different cells express different sets of genes through differential gene regulation.

Question 12

Which stage of embryonic development is characterized by a hollow ball of cells with an inner cell mass and a fluid-filled cavity?

Accepted Answer

Blastula

Question 13

If a mutation causes the Antennapedia gene to be expressed in the head of a fruit fly, what is the likely result?

Accepted Answer

The fly will have legs where its antennae should be.

Question 14

Which of the following is NOT a derivative of the mesoderm?

Accepted Answer

Liver

Question 15

During which stage does the embryo first become a multi-layered structure with ectoderm, mesoderm, and endoderm?

Accepted Answer

Gastrulation

Question 16

Which of the following best describes the concept of 'pattern formation' in animal development?

Accepted Answer

The establishment of spatial organization of tissues and organs based on positional information.

Question 17

Induced pluripotent stem cells (iPSCs) are significant because they:

Accepted Answer

Are adult cells reprogrammed to behave like pluripotent stem cells, reducing ethical concerns.

Question 18

Which of the following equations best represents the relationship between the number of cell divisions ($$n) $$and the number of cells ($$N) $$after cleavage, assuming each division doubles the cell number?

Accepted Answer

$$N = 2^n$$

Question 19

A scientist observes that a certain cell can only differentiate into neurons, but not into muscle or blood cells. This cell is best described as:

Accepted Answer

Unipotent

Question 20

Which of the following is a real-world application of pluripotent stem cells in medicine?

Accepted Answer

Replacing damaged tissues in diseases such as Parkinson's or diabetes

Cell Specialization and Animal Development

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