Foundations Questions for Quiz 4

PCR

Polymerase Chain Reaction, a technique to amplify DNA sequences.

Taq DNA Polymerase

A thermally stable enzyme used in PCR to amplify DNA.

Primers

Short DNA sequences that initiate DNA synthesis in PCR.

Mg++

Acts as a cofactor to enhance the activity of DNA polymerase in PCR.

Denaturing

Heating DNA to separate its two strands in PCR.

Okazaki fragments

Short DNA fragments formed on the lagging strand during DNA replication.

Quantitative PCR

Measures DNA or RNA levels to study gene expression.

DNA polymerase

Synthesizes new DNA strands by adding nucleotides to primers in PCR.

Annealing

Primers bind to the target DNA sequence at a specific temperature in PCR.

Amplified DNA fragments

DNA segments replicated multiple times during PCR.

Chemosensory assay

Test to study an organism's response to chemical stimuli.

Chemotaxis

Movement of organisms toward or away from chemical stimuli.

G-protein coupled receptors

Detect chemical signals and initiate signal transduction pathways.

Sensilla

Structures containing non-motile, sensory cilia in C. elegans.

Chemotaxis index

Calculated based on worm distribution in response to odorants.

Cyclic GMP

Part of the signal transduction pathway activated by chemical signals.

Protein kinases

Regulate signal pathways controlling response to chemical stimuli.

Acetylcholine receptors

Activated by Levamisole to induce paralysis in worms.

Genetic mutation

Can alter chemoreceptor function, affecting responses to chemicals.

Chemotaxis Index

Quantifies directional movement of organisms in response to chemical stimuli.

Control Sample

Consists of a standard solution without the experimental odorant.

Genetic Studies

Assay helps identify genes involved in sensory perception and response.

Sensory Responses

Tested for attraction and repulsion towards chemical compounds.

G-Protein Coupled Receptors

Detect chemicals and trigger cellular responses guiding movement.

Zero Chemotaxis Index

Indicates no preference for experimental odorant over control.

Environmental Control

Ensures consistent conditions for reliable behavior observations.

Sensory Biology

Assay demonstrates real-life applications of genetic and sensory research.

Neurons

Chemosensory neurons detect odorants in C. elegans.

Cyclic GMP

Acts as a second messenger in chemosensory signaling.

Chemotaxis Behaviors

Include movement towards or away from chemicals in C. elegans.

Sensory Cilia

Increase surface area for chemical detection in C. elegans.

Amphid Neurons

Essential for detecting a wide range of environmental chemicals.

Ion Flux

Modulates neuronal activity in response to stimuli for chemotaxis.

Multiple Receptors

Indicate complexity and specialization in sensory capabilities.

Genetic Mutations

Impact behavioral responses in C. elegans, altering chemotactic responses.

Experimental Controls

Include mutant and wild-type strains, control, and experimental samples.

Educational Value

Assay teaches genetics, neurobiology, and the scientific method.

Chemical Attractants vs

Attractants cause aggregation, repellents cause dispersion in C. elegans.

Future Research

Explore genetic basis of sensory perception and evolutionary implications.