Bio1331 Animals - Evolution - Overview Of Body Plans (Lecture Two)

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| By Elly Crook
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Elly Crook
Community Contributor
Quizzes Created: 27 | Total Attempts: 12,642
| Attempts: 66
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  • 1/16 Questions

    Complete the following sentence: At gastrulation, protostomes and deuterostomes develop a ______, a fluid filled cavity completely lined by mesoderm.

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Describe the structure, reproduction and lifestyles of selected invertebrate groups

Bio1331 Animals - Evolution - Overview Of Body Plans (Lecture Two) - Quiz

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  • 2. 

    Complete the following sentence:The hollow blastula undergoes gastrulation, where indentation of cells forms a _________.

    Explanation
    During gastrulation, the hollow blastula undergoes a process where cells start to indent and rearrange, resulting in the formation of a blastopore. The blastopore is the opening that forms in the developing embryo, which eventually gives rise to the digestive tract. This process is crucial for the formation of the three germ layers and the establishment of the body plan in many multicellular organisms.

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  • 3. 

    Complete the following sentence:_________ is the first few divisions of a zygote.

    Explanation
    Cleavage is the first few divisions of a zygote. During cleavage, the zygote undergoes rapid cell division without significant growth, resulting in the formation of smaller cells called blastomeres. These blastomeres continue to divide and eventually form a solid ball of cells called a morula. Cleavage is an essential process in embryonic development as it establishes the basic body plan and determines the number of cells in the developing embryo.

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  • 4. 

    Determinate cleavage occurs when each blastomere sequesters different ___________ regulators/factors that define its specification and fate early on.

    Explanation
    Determinate cleavage is a type of cell division in which each blastomere, or daughter cell, possesses different transcriptional regulators/factors that determine its specification and fate from an early stage. Transcriptional refers to the process of gene expression, where genetic information is transcribed from DNA to RNA. This suggests that the differentiation and fate of each blastomere in determinate cleavage are determined by the specific transcriptional regulators and factors present in each cell. Transcription, on the other hand, refers to the general process of gene expression and does not specifically address the regulation and specification of individual blastomeres.

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  • 5. 

    True or False?Asymmetry occurs in sponges only.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Asymmetry refers to the lack of symmetry or balance in an organism's body structure. Sponges are primitive multicellular organisms that lack any definite body shape or symmetry. They have irregular and asymmetrical body plans, with no distinct front or back, left or right sides. Therefore, it is correct to say that asymmetry occurs in sponges only.

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  • 6. 

    Which of the following is true?

    • In spiral cleavage, mitotic spindles rotate clockwise at 3rd division

    • In spiral cleavage, mitotic spindles rotate clockwise at 2nd division

    • In spiral cleavage, mitotic spindles rotate anti-clockwise at 3rd division

    • In spiral cleavage, mitotic spindles rotate anti-clockwise at 2nd division

    Correct Answer
    A. In spiral cleavage, mitotic spindles rotate clockwise at 3rd division
    Explanation
    In spiral cleavage, mitotic spindles rotate clockwise at the 3rd division. This means that during cell division, the spindles, which are responsible for separating the chromosomes, rotate in a clockwise direction. This rotation pattern is specific to the 3rd division in spiral cleavage, indicating the direction of cell division and the formation of different cell layers.

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  • 7. 

    True or False?Spiral cleavage allows the development of symmetry.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    Spiral cleavage allows for the development of asymmetry.

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  • Mar 17, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Nov 23, 2015
    Quiz Created by
    Elly Crook
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