Bio1331 Animals - Evolution - Deuterostomes And The Evolution Of Chordates (Lecture Six)
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Questions and Answers
- 1.
Which is the correct developmental pattern of a deuterostome?
- A.
Radial cleavage, indeterminate
- B.
Radial cleavage, determinate
- C.
Spiral cleavage, indeterminate
- D.
Spiral cleavage, determinate
Correct Answer
A. Radial cleavage, indeterminateExplanation
The correct developmental pattern of a deuterostome is radial cleavage, indeterminate. Radial cleavage refers to the pattern of cell division in which the cells divide parallel or perpendicular to the polar axis, resulting in a radial arrangement of cells. Indeterminate cleavage means that each cell produced by cleavage has the potential to develop into a complete organism. In deuterostomes, such as echinoderms and chordates, the early embryonic cells are totipotent, meaning they have the ability to develop into any cell type in the organism. Therefore, the correct answer is radial cleavage, indeterminate.Rate this question:
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- 2.
Name one of the three major clades of deuterostomes.
Correct Answer
Echinoderms
The echinoderms
Echinoderm
The Chordates
Chordates
Chordate
The Chordate
The Echinoderm
The Hemichordates
Hemichordates
The Hemichordate
HemichordateExplanation
One of the three major clades of deuterostomes is echinoderms. Echinoderms are a group of marine animals that include starfish, sea urchins, and sea cucumbers. They are characterized by their radial symmetry and unique water vascular system.Rate this question:
- 3.
Name a class of Echinoderms.Please write your answer as singular, with no 'a' or 'the'.e.g. 'dog'
Correct Answer
Sea star
Brittle star
Sea urchin
Feather star
Sea cucumber
Sea daisy - 4.
True or False?Echinoderms have radial symmetry throughout their entire life cycle.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Echinoderms are bilaterally symmetrical as larvae.Rate this question:
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- 5.
True or False?Sea stars can undergo regeneration if they lose an arm.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Sea stars have the ability to regenerate lost body parts, including their arms. When a sea star loses an arm, it can grow a new one through a process called regeneration. This is possible because sea stars have specialized cells in their arms called pluripotent cells, which have the ability to develop into any type of cell needed for regeneration. These cells can divide and differentiate into the necessary tissues and structures to form a new arm. Therefore, the statement "Sea stars can undergo regeneration if they lose an arm" is true.Rate this question:
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- 6.
Sea urchins have 23,000 genes.How many of these genes are shared with humans?
- A.
7,707
- B.
77,070
- C.
770
- D.
77
Correct Answer
A. 7,707Explanation
Sea urchins and humans share a common ancestor, so they have some genes in common. Out of the 23,000 genes in sea urchins, 7,707 of them are shared with humans. This suggests that there are certain genetic similarities and evolutionary relationships between sea urchins and humans.Rate this question:
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- 7.
True or False?All chordates have a notochord.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
All chordates have a notochord, which is a flexible rod-like structure that provides support and serves as the basis for the development of the backbone in vertebrates. This characteristic is a defining feature of chordates, which include animals such as fish, reptiles, birds, and mammals. The notochord is present in the early stages of development in all chordates, although it may be replaced by the vertebral column in some species as they mature. Therefore, it is correct to say that all chordates have a notochord.Rate this question:
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- 8.
What is the function of the notochord in Chordates?
- A.
Provides skeletal support
- B.
Develops into the central nervous system
- C.
Separates inner organs from the hard edges of the spinal cord
Correct Answer
A. Provides skeletal supportExplanation
The notochord in Chordates provides skeletal support. This structure is a flexible rod-like structure that runs along the length of the body, providing support and rigidity. It serves as a precursor to the vertebral column in vertebrates, forming the basis for the development of the backbone. The notochord also plays a role in signaling during embryonic development, guiding the formation of the central nervous system. However, its primary function is to provide support to the body.Rate this question:
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Mar 21, 2023Quiz Edited by
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Nov 25, 2015Quiz Created by
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