A New Organism Is Discovered in the Forests of Costa

question 39

Multiple Choice

A new organism is discovered in the forests of Costa Rica. Scientists there determine that the polypeptide sequence of hemoglobin from the new organism has 72 amino acid differences from humans, 65 differences from a gibbon, 49 differences from a rat, and 5 differences from a frog. These data suggest that the new organism

• A) is more closely related to humans than to frogs.
• B) is more closely related to frogs than to humans.
• C) evolved at about the same time as frogs, which is much earlier than primates and mammals.
• D) is more closely related to humans than to rats.
• E) is more closely related to frogs than to humans and also evolved at about the same time as frogs, which is much earlier than primates and mammals.

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Definitions:

Mass Movement

Forcible peristaltic movement of short duration, occurring only three or four times a day, which moves the contents of the large intestine.

Segmental Contraction

A type of muscle contraction that occurs in the digestive tract, helping move food through the intestines by constricting and relaxing sections of the muscle in a sequential manner.

Segmental Contractions

Contractions in the intestines that mix and move contents by periodically constricting sections of the organ while relaxing others.

Protein Digestion

Protein digestion is the process by which proteins are broken down into amino acids and smaller peptides by enzymes in the digestive system.