Question 1

Which of the following best describes the difference between a zygote and a gamete in animal embryonic development?

Accepted Answer

A zygote is formed by the fusion of two gametes and is diploid, while a gamete is a haploid reproductive cell.

Question 2

During animal embryonic development, what process allows genetically identical cells to become specialized into different cell types?

Accepted Answer

Differential regulation of gene expression

Question 3

Which of the following is a direct result of transcription factors binding to promoter and enhancer sequences on DNA?

Accepted Answer

RNA polymerase is recruited to transcribe the gene.

Question 4

In the context of gene regulation, what is the role of a repressor protein?

Accepted Answer

It binds to DNA and blocks RNA polymerase from transcribing the gene.

Question 5

Which equation correctly represents the change in chromosome number during fertilization in animals?

Accepted Answer

$$n + n = 2n$$

Question 6

What is the primary function of signal transduction pathways in embryonic development?

Accepted Answer

To transmit signals from outside the cell to change gene expression inside the cell

Question 7

Which of the following mechanisms allows large groups of genes to be expressed at once during development?

Accepted Answer

By tightly coiling entire regions of a chromosome so that RNA polymerase cannot access them

Question 8

A signaling molecule binds to a receptor protein on a cell membrane. What is the next step in the signal transduction pathway?

Accepted Answer

The receptor protein changes shape and activates other proteins inside the cell.

Question 9

Which of the following best explains why muscle cells and heart cells in the same organism can have different functions despite having identical DNA?

Accepted Answer

Different genes are expressed in each cell type due to regulation of gene expression.

Question 10

Which process is responsible for the transition from a blastula to a gastrula during animal embryonic development?

Accepted Answer

Gastrulation

Question 11

In plant embryonic development, what is the function of the seed coat?

Accepted Answer

To protect the embryo and regulate water entry during germination

Question 12

Which of the following statements about epigenetics is correct?

Accepted Answer

Epigenetic changes can alter gene expression without changing the DNA sequence.

Question 13

If a gene is 'turned ON' in a cell, what does this mean at the molecular level?

Accepted Answer

The gene is being transcribed and its protein product is being made.

Question 14

Which of the following is an example of a transcriptional regulator?

Accepted Answer

A transcription factor that binds to a promoter sequence

Question 15

What is the result of phosphorylation of a transcription factor?

Accepted Answer

It can activate or deactivate the transcription factor, altering gene expression.

Question 16

Which of the following best describes the process of differentiation in embryonic development?

Accepted Answer

Cells become specialized by expressing different sets of genes.

Question 17

Which of the following is NOT a mechanism for regulating gene expression?

Accepted Answer

Changing the sequence of nucleotides in the gene

Question 18

In the context of plant embryonic development, which cell type is diploid?

Accepted Answer

Embryo cell

Question 19

Which of the following best explains how enhancer sequences affect gene expression?

Accepted Answer

They increase the likelihood that transcription factors will bind and activate transcription.

Question 20

A mutation prevents a repressor protein from detaching from DNA even when an inducer is present. What is the most likely consequence?

Accepted Answer

The gene will remain 'OFF' and not be transcribed.

Regulation of Gene Expression and Embryonic Development in Multicellular Organisms

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