Plant Pigments and Their Characteristics

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Which pigment is responsible for the yellowish-green color of chlorophyll b?

Chlorophyll b (correct)

Chlorophyll a

Flavonoids

Carotenoids

What causes green discoloration of myoglobin due to the presence of hydrogen peroxide?

Formation of choleglobin (correct)

Degradation of chlorophyll

Increase of oxymyoglobin

Conversion to metmyoglobin

Which of the following is NOT an example of a carotenoid?

Lycopene

Capsaicin (correct)

B-carotene

Lutein

What is the primary color associated with lycopene?

Red Signup and view all the answers

Which pigment is not commonly derived from yellow or orange fruits and vegetables?

Chlorophyll Signup and view all the answers

What is the primary role of myoglobin in tissues?

To store oxygen for metabolism Signup and view all the answers

What component of myoglobin is responsible for its color and light absorption?

Heme Signup and view all the answers

Which form of heme iron is considered oxidized?

Ferric (+3) Signup and view all the answers

What happens to the iron atom in myoglobin when it is oxidized?

It converts to metmyoglobin Signup and view all the answers

Which of the following statements is true regarding the color of meat containing primarily myoglobin?

It appears purplish-red Signup and view all the answers

Which reaction leads to the formation of oxymyoglobin?

Binding of molecular oxygen Signup and view all the answers

What is the color change of meat when molecular oxygen binds to myoglobin?

From purplish-red to bright red Signup and view all the answers

What kind of pigments contribute to the green pigmentation noted in cured meats?

Chlorophyll Signup and view all the answers

What is the primary role of heme compounds in meat?

To bind molecular oxygen Signup and view all the answers

Which coordination sites of the iron atom in heme are occupied by nitrogen atoms?

Four coordination sites Signup and view all the answers

Which of the following best describes myoglobin?

A globular protein with a single polypeptide chain Signup and view all the answers

How does hemoglobin facilitate oxygen transport in the body?

By forming reversible complexes with oxygen Signup and view all the answers

What component of myoglobin allows it to accept oxygen?

The iron atom in the heme group Signup and view all the answers

What is the molecular mass of myoglobin?

16.8 kD Signup and view all the answers

Which statement about hemoglobin is inaccurate?

It is a local oxygen store in tissues. Signup and view all the answers

What structural feature is essential for the binding of ligands to heme?

The presence of a histidine residue Signup and view all the answers