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Chapter 6 Cellular Signals
Quiz by Courtney Simpson
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13 questions
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- Q1Which of the following if true of chemical signalling molecules?They produce a response in target cells when releasedThey only stimulate an effect on the cell that produced themThey require carrier proteins to be transported through body fluidsThey always produce a rapid response30s
- Q2In the disease multiple sclerosis, the myelin sheath surrounding the axons of neurons is broken down. One of the symptoms of multiple sclerosis is weakening of the muscles. A possible cause for this weakening could beThe transmission of electrical impluses along the axons of neurons is slowedneurotransmitters are inhibited from travelling along neuronsThe size of the electrical impulses travelling along the axon is smallerneurotransmitter receptors on the muscle cells have become less sensitive30s
- Q3Some responses r reactions seen in individuals are caused by the release of chemicals into the environment by other individuals of the same species. These chemicals are calledEnzymesneurotransmittersPheromonesHormones30s
- Q4Vibrio chlerae produces a toxin that binds to a plasma membrane receptor on intestinal cells of the host. The toxin permanently activates the G protein in target cells, causing them to lose water rapidly. When a person is infected with cholera they suffer severe dehydration. V. chloerae toxinIs an example of a second messenger moleculeActs as a neurohormoneDisrupts normal signal transduction in the cellIs a lipid-soluble molecule30s
- Q5A known relationship between a plant growth hormone (regulator) and its effect includesGibberellin - stomatal closureCytokinin - promotes fruit ripeningAuxin - cell elongationAbscisic acid - promotes flowering30s
- Q6Human and plant hormones are similar in that all areActive on a single target tissueSignalling molecules that act on receptor moleculesComposed of gylcoproteinsTransported around the organism by a circulating fluid30s
- Q7Peptide hormonesMust bind with membrane receptors in order to affect a target cellBind with nuclear DNA in target cellsMay diffuse into a cell through the phospholipid bilayerEnter target cells by active transport30s
- Q8Which of the following is not a function of protein molecules found in the membranes of cells?They act as receptor sites for some signalling moleculesThe facilitate the diffusion of charged particlesThey are the site of active u[take of glucose moleculesThey act as channels for the transport of lipid-soluble molecules30s
- Q9Anti-diuretic hormone (ADH) is an amino acid hormone which plays a major role in the maintenance of a relatively stable concentration of body fluids (osmoregulation) by increasing the permeability of the collecting tubules in the kidneys to water. Which of the following is not involved with the transduction of ADH?Proteins located in the cytosol are activated.A second messenger is activated inside the cellATPReceptors located in the cytosol45s
- Q10A signal transduction pathway is activated by a cytoplasmic receptor. Which of the following would have been the initiating signal?A steroidA protein hormoneA neurotransmitterA neurohormone30s
- Q11After a neurotransmitter binds to the post synaptic terminal it then has to be broken down. Explain how cellular communication would be effected if the neurotransmitter remained bound to the receptor on the post synaptic terminal.The post synaptic neuron will be unresponsive to any further signalling moleculesThe post synaptic neuron would continue to respond to the neurotransmitterThe components of the neurotransmitter cannot be broken down and reusedAdditional neurotransmitter molecules would not be released into the synapse45s
- Q12Neurotransmitters are released into the synapse after an influx of calcium ions into the presynaptic terminal of a neuron. Neurotransmitters are considered to be signalling molecules because:They are secreted by one cell and act on another cellThey are produced in response to a signal being received from another cellThey are released from a target cell by the process of exocytosisThey are produced as a result of neural stimulus occurring45s
- Q13Which of the following relates to steroid hormones?They cause the activation of a second messenger after binding to an internal receptorThey travel to their target cell bound to a transport proteinThe receptors for steroid hormones are always located in the cytosolThey cause the activation of proteins that are already present in the cytosol45s