Top answers

Explain the all-or-nothing principle for an action potential.

In the resting state, the membrane potential of a neuron is around -70 millivolts (mV). When acted upon by a stimulus , the membrane depolarises as Na + gated ion channels open and allow sodium ions to rush ...
OC
Answered by Oyku C. • Biology tutor
65905 Views

Explain how hydrogen bonding occurs between molecules of water.

Hydrogen Bonding occurs between 2 adjacent molecules of H 2 O. The polar covalent bond between oxygen and hydrogen creates negative and positive partial charges respectively. There is a weak intermolecular f...
TH
Answered by Tom H. • Biology tutor
18540 Views

Give 3 differences between DNA and RNA

RNA is single stranded whereas DNA is double stranded RNA has uracil whereas DNA has thymine RNA contain the pentose sugar ribose whereas DNA has deoxyribose
OH
Answered by Oliver H. • Biology tutor
5962 Views

How does glycolysis produce ATP?

Glycolysis produces energy through the form of ATP. ATP is created directly from glycolysis through the process of substrate-level phosphorylation (SLP) and indirectly by oxidative phosporylation (OP). The t...
CH
Answered by Charlie H. • Biology tutor
37722 Views

Why do different blood vessels have different lumen sizes (relative to their overall size)?

Lumen sizes in blood vessels differ due to the differing functions of the vessels themselves. Arteries have to carry oxygenated blood away from the heart to the tissues at high pressure. Small lumen (relativ...
JS
Answered by Jessica S. • Biology tutor
83782 Views