CELL STRUCTURES AND FUNCTION
CELL CYCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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They carry out cellular respiration
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They consist of the pigment chlorophyll
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Their structure is only visible during interphase
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They consist of tightly coiled strands of DNA and proteins
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Detailed explanation-1: -They consist of chromosomal DNA wrapped around special DNA-binding proteins called histones.
Detailed explanation-2: -In the nucleus of each cell, the DNA molecule is packaged into thread-like structures called chromosomes. Each chromosome is made up of DNA tightly coiled many times around proteins called histones that support its structure.
Detailed explanation-3: -Chromosomes are bundles of tightly coiled DNA located within the nucleus of almost every cell in our body. Humans have 23 pairs of chromosomes.
Detailed explanation-4: -Therefore, the answer choice that best describes a chromosome is (B). A chromosome is a thread-like structure of DNA that has been condensed and coiled.
Detailed explanation-5: -The combined loop of DNA and protein is called a nucleosome. Next the nucleosomes are packaged into a thread, which is sometimes described as “beads on a string". The end result is a fiber known as chromatin.