Which of the Following Reactions Is Catalyzed by a Transketolase

question 6

Multiple Choice

Which of the following reactions is catalyzed by a transketolase in the pentose phosphate pathway?
I.
Fructose-6-P + glyceraldehyde-3-P ⇔ xylulose-5-P + erythrose-4-P
II.
Erythrose-4-P + fructose-6-P ⇔ sedoheptulose-7-P + glyceraldehyde-3-P
III.
Sedoheptulose-7-P + glyceraldehyde-3-P ⇔ ribose-5-P + xyulose-5-P

• A) I only
• B) II and III
• C) II only
• D) I and III
• E) I and II

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Definitions:

Ponzo Illusion

A visual illusion where the context causes an object to appear larger or smaller than it actually is.

Moon Illusion

A perceptual phenomenon where the moon appears larger near the horizon than it does higher up in the sky.

Hallucinations

Experiences of sensing something while fully conscious and without any actual external input, yet these experiences seem very real.

Ambiguous Figures

Visual images or objects that can be interpreted in more than one way, illustrating the concept of perceptual set.