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Introduction: Cell signaling is one of the important features observed in the animal cell. The animal cells communicate with each other by the mechanism of direct cell-to-cell contact. Scientists discovered that the multicellular animal cells have evolved from an ancient unicellular organism.
Answer to Problem 1TY
Correct answer: Choanomonada can be used to study the evolution of cell-to-cell signaling mechanism in animal cells. Hence, the correct answer is option c.
Explanation of Solution
Reason for correct answer:
Choanoflagellates, also known as Choanomonada, are eukaryotic organisms. These organisms are believed to be the species that have closest association with the multicellular organisms (especially animals). Choanomonada and animals have a similar cell-to-cell signaling mechanism. Therefore, Choanomonada can be used to study the evolution of animal-specific cell-to-cell signaling system.
Option c. is given as “Choanomonada”.
The group that can be used to study the evolution of animal-specific cell-to-cell signaling mechanism is Choanomonada. Hence, the correct answer is option c.
Reasons for incorrect answer:
Option a. is given as, “Rhodophyta”.
Rhodophyta is also known as red algae and they are able to perform photosynthesis. Photosynthesis is a process observed in plants and not in animals. This indicates that Rhodophyta represents a close association with plants. They cannot be used to study the animal-specific cell-to-cell signaling system. Hence, option a. is incorrect.
Option b. is given as, “Excavata”.
Excavata cannot be used to study the evolution of cell-to-cell signaling mechanism in animal cells. This is because, they include both photosynthetic and heterotrophic organisms. They do not resemble animal cells as animals do not perform photosynthesis. Hence, option b. is incorrect.
Option d. is given as, “Radiolaria”.
Radiolarian lives in an aquatic habitat and they are heterotrophic in nature. They cannot be used to study the evolution of cell-to-cell signaling system as they do not share similarities with the animal cells. Hence, option d. is incorrect.
Option e. is given as, “Chlorophyta”.
Chlorophyta is also referred to as green algae. They contain the same photosynthetic pigments that are present in the plants. Chlorophyta performs photosynthesis and shows a close association with plants and not animals. They cannot be used to study the animal-specific cell-to-cell signaling system. Hence, option e. is incorrect.
Hence, the options a., b., d., and e. are incorrect.
The group that can be used to study the evolution of animal-specific cell-to-cell signaling mechanism is Choanomonada. This is because, they show a close association with animal cells.
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Chapter 28 Solutions
BROOKER BIOLOGY
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