Gene expression

Open Ended

How might environmental factors influence gene expression in multicellular organisms?

Multiple Choice

Why is understanding gene regulation and expression important for studying living organisms?

• It helps explain how traits are inherited and expressed.

• It is only relevant to plants.

• It has no impact on health or disease.

• It is not related to evolution.

Multiple Choice

Which of the following best describes the role of DNA-binding proteins in prokaryotes?

• They regulate genes by controlling transcription.

• They synthesize new DNA strands.

• They break down lactose in the cell.

• They transport RNA out of the nucleus.

Multiple Choice

Which regions are located in front of the operon's three genes and what are their functions?

• Promoter and operator; promoter binds RNA polymerase, operator binds repressor

• Operator and enhancer; operator binds RNA polymerase, enhancer binds repressor

• Promoter and enhancer; promoter binds repressor, enhancer binds RNA polymerase

• Operator and silencer; operator binds RNA polymerase, silencer binds repressor

Multiple Choice

When the lac repressor binds to the operator region, what is the immediate effect on transcription of the lac genes?

• Transcription is blocked because RNA polymerase cannot reach the genes.

• Transcription is increased due to enhanced RNA polymerase binding.

• The lac genes are duplicated.

• The operator region is deleted.

Open Ended

Explain how the lac operon is regulated in the presence and absence of lactose.

Fill in the Blank

A typical eukaryotic gene has a ___ box.

Multiple Choice

Which region of the DNA do transcription factors bind to in order to regulate gene expression?

• Enhancer

• Exon

• Intron

• Promoter

Open Ended

Explain how the regulation of gene expression contributes to the development of specialized cell types in multicellular organisms.

Multiple Select

Which of the following statements about homeotic genes is/are correct?

• Homeotic genes regulate organ development.

• Homeobox genes code for transcription factors.

• Hox genes determine the identities of each body segment.

• Homeotic genes are only found in fruit flies.

Fill in the Blank

Environmental conditions can affect gene expression and influence genetically determined traits. The phenotype of an organism is only partly determined by its ___.

Open Ended

Describe how epigenetic mechanisms can influence gene activity throughout an organism’s life cycle.

Open Ended

How does gene expression affect development?

Open Ended

Reflecting on today's lesson, what aspect of gene regulation or expression would you like to learn more about or found most interesting?

Multiple Choice

How does the environment influence gene expression in multicellular organisms?

• By changing the DNA sequence

• By affecting epigenetic markers

• By altering the number of chromosomes

• By preventing cell division