If Ribonucleotides Were Depleted from a Cell During S Phase

question 2

Multiple Choice

If ribonucleotides were depleted from a cell during S phase, how would DNA synthesis be affected? (Ignore energetic considerations.)

• A) There would be no effect because ribonucleotides are used in RNA synthesis, not DNA synthesis.
• B) DNA synthesis would continue but at a slower rate.
• C) There would only be an effect during M phase, not in S phase.
• D) DNA synthesis would not be affected because ribonucleotides are only used during the process of transcription.
• E) Replication would cease because ribonucleotides are required to initiate DNA synthesis.

---

Definitions:

Neuron

A specialized cell transmitting nerve impulses; a fundamental component of the nervous system.

Feature Detector

Brain cells that react to particular aspects of a stimulus, like lines, borders, or motion.

Visual Cortex

The Visual Cortex is the part of the brain responsible for processing visual information, located in the occipital lobe.

Retina

The light-sensitive layer of tissue at the back of the eye that processes visual information received and transmits it to the brain.