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Origins of replication, centromeres, and telomeres are all involved in replication and segregation of chromosomes. Classify each statement below under the structure it describes. Each mammalian cell contains 10,000 of these, scattered through the chromatin of the nucleus. As a cell divides successively, this structure is prone to shortening in the absence of an enzyme that lengthens it; shortening puts a limit on how many times a particular cell is able to divide. If an average human chromosome had only one of these, its replication would take more than a month. Origin of replication Certain proteins unwind the DNA double helix here to create mirror- image replication forks. In humans, this component consists of the sequence TTAGGG repeated 250-1500 times, depending on the cell type. This component can occur almost anywhere on a chromosome, except at the very ends. Telomere This structure is found at the ends of linear chromosomes. Cleavage of the cohesin complex of this structure occurs at anaphase of mitosis and anaphase Il of meiosis; it is protected from cleavage during anaphase I of meiosis by the protein Shugoshin. A structure contained within blocks of repetitive, simple noncoding sequences, known as satellite DNAs. Centromere

Origins of replication, centromeres, and telomeres are all involved in replication and segregation of chromosomes. Classify each statement below under the structure it describes. Each mammalian cell contains 10,000 of these, scattered through the chromatin of the nucleus. As a cell divides successively, this structure is prone to shortening in the absence of an enzyme that lengthens it; shortening puts a limit on how many times a particular cell is able to divide. If an average human chromosome had only one of these, its replication would take more than a month. Origin of replication Certain proteins unwind the DNA double helix here to create mirror- image replication forks. In humans, this component consists of the sequence TTAGGG repeated 250-1500 times, depending on the cell type. This component can occur almost anywhere on a chromosome, except at the very ends. Telomere This structure is found at the ends of linear chromosomes. Cleavage of the cohesin complex of this structure occurs at anaphase of mitosis and anaphase Il of meiosis; it is protected from cleavage during anaphase I of meiosis by the protein Shugoshin. A structure contained within blocks of repetitive, simple noncoding sequences, known as satellite DNAs. Centromere

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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Origins of replication, centromeres, and telomeres are all involved in replication and segregation of chromosomes. Classify each statement below under the structure it describes. Each mammalian cell contains 10,000 of these, scattered through the chromatin of the nucleus. As a cell divides successively, this structure is prone to shortening in the absence of an enzyme that lengthens it; shortening puts a limit on how many times a particular cell is able to divide. If an average human chromosome had only one of these, its replication would take more than a month. Origin of replication Reset Certain proteins unwind the DNA double helix here to create mirror- image replication forks. In humans, this component consists of the sequence TTAGGG repeated 250-1500 times, depending on the cell type. This component can occur almost anywhere on a chromosome, except at the very ends. Telomere This structure is found at the ends of linear chromosomes. Cleavage of the cohesin complex of this structure occurs at anaphase of mitosis and anaphase II of meiosis; it is protected from cleavage during anaphase I of meiosis by the protein Shugoshin. A structure contained within blocks of repetitive, simple noncoding sequences, known as satellite DNAs. Centromere
Transcribed Image Text:Origins of replication, centromeres, and telomeres are all involved in replication and segregation of chromosomes. Classify each statement below under the structure it describes. Each mammalian cell contains 10,000 of these, scattered through the chromatin of the nucleus. As a cell divides successively, this structure is prone to shortening in the absence of an enzyme that lengthens it; shortening puts a limit on how many times a particular cell is able to divide. If an average human chromosome had only one of these, its replication would take more than a month. Origin of replication Reset Certain proteins unwind the DNA double helix here to create mirror- image replication forks. In humans, this component consists of the sequence TTAGGG repeated 250-1500 times, depending on the cell type. This component can occur almost anywhere on a chromosome, except at the very ends. Telomere This structure is found at the ends of linear chromosomes. Cleavage of the cohesin complex of this structure occurs at anaphase of mitosis and anaphase II of meiosis; it is protected from cleavage during anaphase I of meiosis by the protein Shugoshin. A structure contained within blocks of repetitive, simple noncoding sequences, known as satellite DNAs. Centromere
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