Concept explainers
Videos
Introduction :
The given figure is of Euglena gracilis . They are single-celled algae of genus Euglena. They usually found in freshwater and have characteristics of both animals and plants. They have secondary chloroplasts for the process of photosynthesis which is a characteristic of plants, but they lack a cell wall which is a characteristic of animals. They are mixotrophs that means they are able to feed themselves by the process of photosynthesis or by phagocytosis.
Answer to Problem 28A
Correct answer :
The correct answer is option (B) eyespot.
Explanation of Solution
Explanation/justification for the correct answer :
Option (B) eyespot. In euglena, the eyespot is found in the gullet near the base of flagellum. It is also known as stigma. Eyespot is a highly pigmented area that functions in the light reception. It is a light-sensitive receptor that directs the euglena towards the light for the process of photosynthesis. It means euglena use eyespot to sense the light. So, the correct answer is option (B).
Explanation for incorrect answer :
Option (A) chloroplast. Chloroplasts are the cell organelles that perform photosynthesis. They have the ability to absorb sunlight. Euglena contain photosynthesizing chloroplasts that enable them to sustain by the autotrophy. So, this is an incorrect option.
Option (C) nucleus. The nucleus is found in the center of euglena’s cell body. The nucleus contains the genetic material of the cell and regulates the different types of cell activities. It is not used as a light-sensing structure. So, this is an incorrect answer.
Option (D) pellicle. Euglena don’t have cell walls but instead of cell wall they have a pellicle which is composed of a protein layer with a substructure of microtubules. They are arranged in strips around the cell. The strips of pellicle slide over one another and permit the euglenoid to crawl in the mud when the level of water is very low to swim. So, option (D) is also incorrect.
Chapter 19 Solutions
Biology Illinois Edition (Glencoe Science)
Additional Science Textbook Solutions
Campbell Biology (11th Edition)
Campbell Biology: Concepts & Connections (9th Edition)
Organic Chemistry (8th Edition)
Chemistry: An Introduction to General, Organic, and Biological Chemistry (13th Edition)
Introductory Chemistry (6th Edition)
Physics for Scientists and Engineers: A Strategic Approach, Vol. 1 (Chs 1-21) (4th Edition)
- There is a species of eagle, which lives in a tropical forest in Brazil. The alula pattern of its wings is determined by a single autosomal gene with four alleles that exhibit an unknown hierarchy of dominance. Genetic testing shows that individuals 1-1, 11-4, 11-7, III-1, and III-4 are each homozygous. How many possible genotypes among checkered eagles in the population?arrow_forwardwhat is this called?arrow_forwardcan you help me identify this it's based on onion rootarrow_forward
- Which evidence-based stress management techniques are most effective in reducing chronic stress and supporting college students’ academic success?arrow_forwardstudents in a science class investiged the conditions under which corn seeds would germinate most successfully. BAsed on the results which of these factors appears most important for successful corn seed germination.arrow_forwardI want to write the given physician orders in the kardex formarrow_forward
- Amino Acid Coclow TABle 3' Gly Phe Leu (G) (F) (L) 3- Val (V) Arg (R) Ser (S) Ala (A) Lys (K) CAG G Glu Asp (E) (D) Ser (S) CCCAGUCAGUCAGUCAG 0204 C U A G C Asn (N) G 4 A AGU C GU (5) AC C UGA A G5 C CUGACUGACUGACUGAC Thr (T) Met (M) lle £€ (1) U 4 G Tyr Σε (Y) U Cys (C) C A G Trp (W) 3' U C A Leu בוט His Pro (P) ££ (H) Gin (Q) Arg 흐름 (R) (L) Start Stop 8. Transcription and Translation Practice: (Video 10-1 and 10-2) A. Below is the sense strand of a DNA gene. Using the sense strand, create the antisense DNA strand and label the 5' and 3' ends. B. Use the antisense strand that you create in part A as a template to create the mRNA transcript of the gene and label the 5' and 3' ends. C. Translate the mRNA you produced in part B into the polypeptide sequence making sure to follow all the rules of translation. 5'-AGCATGACTAATAGTTGTTGAGCTGTC-3' (sense strand) 4arrow_forwardWhat is the structure and function of Eukaryotic cells, including their organelles? How are Eukaryotic cells different than Prokaryotic cells, in terms of evolution which form of the cell might have came first? How do Eukaryotic cells become malignant (cancerous)?arrow_forwardWhat are the roles of DNA and proteins inside of the cell? What are the building blocks or molecular components of the DNA and proteins? How are proteins produced within the cell? What connection is there between DNA, proteins, and the cell cycle? What is the relationship between DNA, proteins, and Cancer?arrow_forward
Human Anatomy & Physiology (11th Edition)BiologyISBN:9780134580999Author:Elaine N. Marieb, Katja N. HoehnPublisher:PEARSON
Biology 2eBiologyISBN:9781947172517Author:Matthew Douglas, Jung Choi, Mary Ann ClarkPublisher:OpenStax
Anatomy & PhysiologyBiologyISBN:9781259398629Author:McKinley, Michael P., O'loughlin, Valerie Dean, Bidle, Theresa StouterPublisher:Mcgraw Hill Education,
Molecular Biology of the Cell (Sixth Edition)BiologyISBN:9780815344322Author:Bruce Alberts, Alexander D. Johnson, Julian Lewis, David Morgan, Martin Raff, Keith Roberts, Peter WalterPublisher:W. W. Norton & Company
Laboratory Manual For Human Anatomy & PhysiologyBiologyISBN:9781260159363Author:Martin, Terry R., Prentice-craver, CynthiaPublisher:McGraw-Hill Publishing Co.
Inquiry Into Life (16th Edition)BiologyISBN:9781260231700Author:Sylvia S. Mader, Michael WindelspechtPublisher:McGraw Hill Education