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Related Concept Videos

Feedback Inhibition

Feedback Inhibition

Biochemical reactions are occurring constantly in cells, converting starting substances to different products, usually with the help of enzymes that speed the reactions. Without enzymes, it would take far too long for most reactions to occur to be useful to the cell!

Feedback Loops

Feedback Loops

In most cases, excessive hormone production is prevented by negative feedback—a loop that starts with a stimulus inducing the release of a particular substance, like a hormone, to maintain a certain level before triggering a signal that results in a decrease in further release of the hormone.

Internal Receptors

Internal Receptors

Many cellular signals are hydrophilic and therefore cannot pass through the plasma membrane. However, small or hydrophobic signaling molecules can cross the hydrophobic core of the plasma membrane and bind to internal, or intracellular, receptors that reside within the cell. Many mammalian steroid hormones use this mechanism of cell signaling, as does nitric oxide (NO) gas.

Allergic Reactions

Allergic Reactions

Proofreading

Proofreading

Proofreading

Proofreading

Synthesis of new DNA molecules is carried out by the enzyme DNA polymerase, which adds nucleotides on the daughter strand complementary to the template DNA strand. DNA polymerase has a higher affinity to add the correct base and ensures fidelity during DNA replication. Furthermore, it exhibits proofreading activity during replication, using an exonuclease domain that cuts off incorrect nucleotides from the nascent DNA strand.
Errors During Replication are Corrected by the DNA Polymerase...

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Related Experiment Video

Updated: Feb 23, 2026

Scanning Skeletal Remains for Bone Mineral Density in Forensic Contexts

Scanning Skeletal Remains for Bone Mineral Density in Forensic Contexts

Published on: January 29, 2018

Authors' reply

Nav Kapur¹, Leah Quinlivan¹, Sarah Steeg¹

¹Nav Kapur, MBChB, MMedSci, MD, FRCPsych, Centre for Suicide Prevention, Manchester Academic Health Science Centre, University of Manchester, and Greater Manchester Mental Health NHS Foundation Trust, Manchester, UK; Leah Quinlivan, PhD, Centre for Suicide Prevention, Manchester Academic Health Science Centre, University of Manchester, Manchester; Sarah Steeg, NIHR Doctoral Research Fellow, Institute of Brain, Behaviour and Mental Health, Faculty of Medical and Human Sciences, University of Manchester, Manchester; Rory O'Connor, PhD, Institute of Health and Wellbeing, University of Glasgow, Glasgow; Keith Hawton, DSc, Centre for Suicide Research, University Department of Psychiatry, Warneford Hospital, Oxford; David Gunnell, DSc, School of Social and Community Medicine, University of Bristol, Bristol.

The British Journal of Psychiatry : the Journal of Mental Science

|September 3, 2017

Summary

No abstract available in PubMed .

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