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Use the following information to answer the question below. Trichoplax adhaerens (Tp) is the only living species in the phylum Placozoa. Individuals are about 1 mm wide and only 27 um high, are irregularly shaped, and consist of a total of about 2,000 cells, which are diploid (2n= 12). There are four types of cells, none of which are nerve or muscle cells, and none of which have cell walls. They move using cilia, and any "edge" can lead. Tp feeds on marine microbes, mostly unicellular green algae, by crawling atop the algae and trapping it between its ventral surface and the substrate. Enzymes are then secreted onto the algae, and the resulting nutrients are absorbed. Tp sperm cells have never been observed, nor have embryos past the 64-cell (blastula) stage. If Tp sperms are observed by future researchers, how many chromosomes should be found in a Tp sperm nucleus? Select one: O A. 2 O B. 6 OC. 12 O D. 3

Use the following information to answer the question below. Trichoplax adhaerens (Tp) is the only living species in the phylum Placozoa. Individuals are about 1 mm wide and only 27 um high, are irregularly shaped, and consist of a total of about 2,000 cells, which are diploid (2n= 12). There are four types of cells, none of which are nerve or muscle cells, and none of which have cell walls. They move using cilia, and any "edge" can lead. Tp feeds on marine microbes, mostly unicellular green algae, by crawling atop the algae and trapping it between its ventral surface and the substrate. Enzymes are then secreted onto the algae, and the resulting nutrients are absorbed. Tp sperm cells have never been observed, nor have embryos past the 64-cell (blastula) stage. If Tp sperms are observed by future researchers, how many chromosomes should be found in a Tp sperm nucleus? Select one: O A. 2 O B. 6 OC. 12 O D. 3

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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**Trichoplax adhaerens: A Unique Marine Organism** **Introduction:** _Trichoplax adhaerens_ (Tp) stands as the sole representative of the phylum Placozoa. This fascinating organism, known for its simple and irregular structure, offers valuable insights into basic biological processes. **Physical Characteristics:** - **Size:** Approximately 1 mm in width and 27 μm in height. - **Shape:** Irregular. - **Composition:** Roughly 2000 cells, diploid with a chromosome number of 2n = 12. **Cell Types and Structure:** - There are four distinct cell types within Tp. - None of these cells are specialized as nerve or muscle cells. - Absence of cell walls. **Movement and Feeding:** - Tp employs cilia for locomotion, with any edge capable of leading its movement. - It feeds primarily on marine microbes, especially unicellular green algae. **Feeding Mechanism:** 1. **Crawling:** Tp crawls atop algae. 2. **Entrapment:** The algae are trapped between Tp’s ventral surface and the substrate. 3. **Enzymatic Action:** Enzymes are secreted onto the algae, breaking them down. 4. **Absorption:** The resultant nutrients are absorbed by Tp. **Reproduction Insights:** - Tp sperm cells have not been observed. - No embryos have been noted beyond the 64-cell (blastula) stage. **Understanding Chromosomal Composition:** If Tp sperms are observed in future research, it's essential to determine the chromosomal count in the sperm nucleus. Considering the diploid nature (2n = 12), one must understand the haploid number (n) to hypothesize sperm chromosomal count. **Question Prompt Analysis:** - **Question:** If Tp sperms are observed by future researchers, how many chromosomes should be found in a Tp sperm nucleus? - **Answer Choices:** 1. \( \mathbf{A. \ 2} \) 2. \( \mathbf{B. \ 6} \) 3. \( \mathbf{C. \ 12} \) 4. \( \mathbf{D. \ 3} \) Given the information that Tp is diploid with 2n = 12, the haploid number (n) would be 6. Hence, Tp sper
Transcribed Image Text:**Trichoplax adhaerens: A Unique Marine Organism** **Introduction:** _Trichoplax adhaerens_ (Tp) stands as the sole representative of the phylum Placozoa. This fascinating organism, known for its simple and irregular structure, offers valuable insights into basic biological processes. **Physical Characteristics:** - **Size:** Approximately 1 mm in width and 27 μm in height. - **Shape:** Irregular. - **Composition:** Roughly 2000 cells, diploid with a chromosome number of 2n = 12. **Cell Types and Structure:** - There are four distinct cell types within Tp. - None of these cells are specialized as nerve or muscle cells. - Absence of cell walls. **Movement and Feeding:** - Tp employs cilia for locomotion, with any edge capable of leading its movement. - It feeds primarily on marine microbes, especially unicellular green algae. **Feeding Mechanism:** 1. **Crawling:** Tp crawls atop algae. 2. **Entrapment:** The algae are trapped between Tp’s ventral surface and the substrate. 3. **Enzymatic Action:** Enzymes are secreted onto the algae, breaking them down. 4. **Absorption:** The resultant nutrients are absorbed by Tp. **Reproduction Insights:** - Tp sperm cells have not been observed. - No embryos have been noted beyond the 64-cell (blastula) stage. **Understanding Chromosomal Composition:** If Tp sperms are observed in future research, it's essential to determine the chromosomal count in the sperm nucleus. Considering the diploid nature (2n = 12), one must understand the haploid number (n) to hypothesize sperm chromosomal count. **Question Prompt Analysis:** - **Question:** If Tp sperms are observed by future researchers, how many chromosomes should be found in a Tp sperm nucleus? - **Answer Choices:** 1. \( \mathbf{A. \ 2} \) 2. \( \mathbf{B. \ 6} \) 3. \( \mathbf{C. \ 12} \) 4. \( \mathbf{D. \ 3} \) Given the information that Tp is diploid with 2n = 12, the haploid number (n) would be 6. Hence, Tp sper
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