Cell Division Signals and Signal Transduction Quiz

Choose a study mode

Play Quiz

Study Flashcards

Spaced Repetition

Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What are the signals that induce cell division, and how are they transmitted to the nucleus?

Nutrients and oxygen; signals are transmitted to the nucleus through endocytosis
Toxins and pathogens; signals are transmitted to the nucleus via passive diffusion
Growth factors and mitogens; signals are relayed to the nucleus via signal transduction (correct)
Hormones and neurotransmitters; signals are directly transmitted to the nucleus

What happens when a cell receives a mitogenic signal?

Activated protein translation and pathways for energy production, anabolic metabolism, and creation of organelles (correct)
Cell enters a dormant state and stops all metabolic activities
Cell membrane ruptures due to excessive signal amplification
Cell undergoes programmed cell death (apoptosis)

What maintains the balance in cell proliferation and inhibition in tissues?

Cells undergo uncontrolled proliferation regardless of the tissue state
-ve regulations (TSGs) often inactivated by mutations/epigenetic effects
Proliferates only via external stimuli and stops when normal tissue is restored (correct)
+ve regulators (from proto-oncogenes) might become oncogene when activated by mutations/epigenetic effects

Can you explain the pathway of mitogenic signalling in more detail?

<p>Receptor on p.m. binds to mitogen → signal amplified by second messengers → signal reaches nucleus → gene expression (A)</p> Signup and view all the answers

What characterises receptor tyrosine kinases (RTKs) and their activation?

<p>Cytoplasmic tyrosine kinase domain phosphorylates peptides when ligands bind (activation → dimerization) creating docking sites for adaptor proteins to propagate signals (C)</p> Signup and view all the answers

Flashcards are hidden until you start studying