A Molecular Clock Is Best Defined As

question 11

Multiple Choice

A molecular clock is best defined as:

• A) the information contained in DNA or protein sequences that shows changes over time
• B) genes that under selective pressure show a higher rate in mutation frequencies
• C) organisms in favorable environments that have greater offspring potential
• D) the time between Earth's creation and the beginnings of life in an RNA world
• E) a monophyletic group of organisms that replicate in synchrony

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Definitions:

Cross Extension Reflex

A reflex action that involves the contraction of extensor muscles in one limb when the flexor muscles are contracted in the opposite limb, crucial for coordinated locomotion.

Golgi Tendon Reflex

A protective reflex mechanism that helps prevent muscle and tendon damage by relaxing the muscle when too much tension is applied.

Largest Nerve

The sciatic nerve, which runs from the lower back down through the leg, is considered the largest nerve in the human body.

Stretch Reflex

A muscle's reflexive tightening in reaction to being stretched, serving as a protective action to avoid excessive extension.