Lesson 6.1.1b
6.1.1b Genetic control of development and apoptosis Quiz: OCR Biology, Unit 7
20 questions
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Lesson 6.1.1b, Genetic control of development and apoptosis: 20 multiple choice questions for the OCR Biology (H020), Unit 7: Genetics and evolution, written with Revision Ninja.
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The 20 questions
-
In which kingdom groups are homeobox gene sequences found?
- Bacteria and viruses
- Plants and prokaryotes
- Plants, animals, fungi
- Animals only
-
What is the main role of Hox genes during development?
- Synthesising cell walls
- Controlling body plans
- Producing cellular energy
- Initiating DNA replication
-
What is the biology term for genetically programmed cell death?
- Necrosis
- Phagocytosis
- Cytokinesis
- Apoptosis
-
Which developmental process relies on apoptosis in human embryos?
- Heart beating
- Skin pigmentation
- Bone ossification
- Digits separation
-
What distinguishes apoptosis from necrosis during cell death?
- Uncontrolled membrane rupture
- Triggers acute inflammation
- Causes cell swelling
- No inflammatory response
-
Genes regulating apoptosis respond to which type of signals?
- Internal and external
- Internal signals only
- External signals only
- Hormonal signals only
-
Hox genes are a subset of which larger group of genes?
- Lac genes
- Homeobox genes
- Haemoglobin genes
- Caspase genes
-
A Hox gene mutation producing a leg instead of an antenna demonstrates what function?
- Controlling cell division
- Triggering cell differentiation
- Regulating protein synthesis
- Specifying segment identity
-
A cell receives a signal from DNA damage and activates a gene that triggers its own death. Which process is this?
- Apoptosis
- Mitosis
- Cytokinesis
- Meiosis
-
What condition occurs if apoptosis fails between embryonic digits?
- Shortened digits
- Missing digits
- Webbed digits
- Extra digits
-
What occurs when the rate of mitosis exceeds the rate of apoptosis?
- Net tissue growth
- Net tissue shrinkage
- Rapid cell death
- Constant cell number
-
What type of enzymes are caspases, which act during apoptosis?
- Lipases
- Carbohydrases
- Polymerases
- Proteases
-
What is the result when a cell with DNA damage avoids apoptosis?
- Tissue atrophy
- Tumour formation
- Controlled cell division
- Cell cycle arrest
-
What does it mean if Hox genes are described as highly conserved?
- Found in prokaryotes
- Similar across species
- Unique to animals
- Rapidly mutating
-
Which factor acts as an external stimulus for apoptosis?
- Nuclear decay
- RNA breakdown
- Cytokines
- DNA damage
-
What does spatial expression of Hox genes in an embryo determine?
- Total cell number
- Overall embryo size
- Regional tissue differentiation
- Cell division rate
-
What is the primary developmental function of apoptosis in embryos?
- Providing energy storage
- Sculpting tissue shapes
- Mutating regulatory genes
- Increasing cell count
-
A cell population of 800 cells gains 200 cells per hour by mitosis and loses 50 cells per hour by apoptosis. What is the net change over 4 hours?
- +600 cells
- +150 cells
- +800 cells
- -600 cells
-
Switching off genes that control apoptosis leads to which cellular outcome?
- Cell survival
- Cell lysis
- Cellular senescence
- Cellular differentiation
-
Why is the precise spatial and temporal regulation of developmental genes crucial?
- Establishes body plan
- Inhibits cell division
- Prevents gene mutation
- Increases ATP production
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