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Explain the roles of the rough endoplasmic reticulum and the Golgi apparatus in protein trafficking and modification.

Proteins are produced at the ribosome. Ribosomes dock to the rER membrane on translocons and peptide is inserted into the rER lumen coupled with ATP hydrolysis. The peptide folds into its tertiary structure ...
WF
Answered by William F. • Biology tutor
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Describe and explain the series of events leading to excitatory post synaptic stimulation upon the activation of a pacinian corpuscle.

Pacinian corpuscle is stimulated by pressure on the skin. 2) This opens stretch mediated sodium ion channels. 3) Sodium ions leak into the sensory nerve axon via facilitated diffusion thereby causing depolar...
KD
Answered by Kestra D. • Biology tutor
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Describe how information passes across a synapse.

A chemical called a neurotransmitter passes from one neurone to the next causing an electrical impulse.
JH
Answered by Jordan H. • Biology tutor
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Describe the structure of human DNA (4 marks)

- 2 strands: Intertwine to form a double-helix structure Phosphodiester bonds between between phosphate group and pentose sugar of nucleotides - 4 Bases: Cytosine, Guanine, Adenine, Thymine. Complementary ba...
CC
Answered by Christos C. • Biology tutor
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Explain how the nerve impulse passes along the neuron

Resting membrane potential of a neuron is maintained by active transport of sodium (Na+) out of the cell and potassium (K+) into the cell through the Na+/K+ pump. Due to the negative charge of Cl- and some a...
EK
Answered by Elena K. • Biology tutor
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