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Types of Heterochromatin in Genetics

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Questions and Answers

Which of the following best describes the permanence of heterochromatin silencing?

Heterochromatin silencing is not necessarily permanent due to reversible modifications. (correct)

Heterochromatin silencing is always permanent and irreversible.

Heterochromatin silencing can be reversed only in response to developmental cues.

Heterochromatin silencing is not reversible under any circumstances.

What do T cell receptors (TCRs) recognize?

Antigens on the surface of T cells

Antigens presented by major histocompatibility complex (MHC) molecules (correct)

Antigens released by damaged cells

Soluble antigens

Do protein recognition receptors exhibit specificity in antigen recognition?

They recognize antigens randomly without any specificity.

They exhibit specificity only towards viral antigens.

No, they recognize antigens non-specifically based on size.

Yes, they exhibit specificity in recognizing antigen patterns or structures. (correct)

How is X inactivation in human females mediated?

By long non-coding RNAs (lncRNAs) like XIST Signup and view all the answers

What is the purpose of Chromatin immunoprecipitation coupled with sequencing (ChIP-seq)?

To map the genomic regions bound by specific transcription factors Signup and view all the answers

What role do maternal effect genes play in embryos?

Influencing early embryonic development and specifying the body axis Signup and view all the answers

Do prokaryotes possess non-coding RNAs (ncRNAs)?

Yes, they are involved in various cellular processes including gene expression regulation Signup and view all the answers

If a gene knockout leads to lethality in an animal model, what does it indicate about the gene?

The gene is essential for normal development or physiological function Signup and view all the answers

What is the main characteristic of heterochromatin?

It is transcriptionally inactive Signup and view all the answers

What type of DNA sequences does constitutive heterochromatin typically contain?

Repetitive DNA sequences Signup and view all the answers

What role does facultative heterochromatin play in gene expression?

Regulating gene expression during development and in response to environmental cues Signup and view all the answers

What contributes to the transcriptional repression of genes within heterochromatic regions?

Binding of histone proteins and specific histone modifications Signup and view all the answers