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Examen
PSB-HO: Natural Sciences: Chemistry (III) Questions and Correct Answers/ Latest Update / Already Graded
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--26marzo 20252024/2025A+Disponible en un paquete
- Matter- 
Ans: Substances that has mass and occupies space (volume). 
 
Mass- 
Ans: is a measure of the amount of substance in an object. 
 
Weight- 
Ans: is a measure of the gravitational pull of earth on any object. 
 
The 4 states of matter & their characteristics: 
2 | Page 
 
Ans: 1. Solid- dense and rigid with strong bonds. 
2. Liquid- not dense and move around easily and have weak bonds. 
3. Gas- atoms move around independently and do not form bonds. 
4. Plasma- ioni...
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Expert1
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Examen
PSB Exam 1 Study Guide Questions and Correct Answers/ Latest Update / Already Graded
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--29marzo 20252024/2025A+Disponible en un paquete
- Depolarization of the axon terminal causes influx of what ion? 
Ans: Calcium 
 
What is triggered by influx of the ion listed above? 
Ans: exocytosis 
 
What are the two basic mechanisms for inactivation neurotransmitter 
in the synaptic cleft? 
Ans: After a chemical is released, it must be inactivated. Inactivation can 
be through a reuptake mechanism or by an enzyme that stops the action 
of the chemical. 
 
Neurotransmitters: 
2 | Page 
 
Ans: communicate locally across...
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Expert1
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Examen
PSB Exam 1 Study Guide 2024/2025 Exam Questions and Answers | A+ Score Assured
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---19marzo 20252024/2025A+
- PSB Exam 1 Study Guide 2024/2025 
Exam Questions and Answers | A+ 
Score Assured 
Depolarization of the axon terminal causes influx of what ion? -
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