Tag: the mitotic cell cycle

Questions Related to the mitotic cell cycle

The structure present over chromosome

botany the mitotic cell cycle chromosome and its structure chromosome nucleus and chromosome

  1. Nucleolus

  2. Centromere

  3. Centrochrome

  4. Golgi bodies

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Correct Option: B
Explanation:

Centromere is a region of chromosomes which holds sister chromatids together and the area where chromosome are attached to spindle fibres during cell division.

In man the normal number of

chromosomes is

botany the mitotic cell cycle chromosome and its structure chromosome nucleus and chromosome

  1. 42

  2. 44

  3. 46

  4. 48

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Correct Option: C
Explanation:

At first time Tizo and Levan in 1956 enabled the human geneticists to as certain the correct chromosome number (46 pairs).

Chromatid is

botany the mitotic cell cycle chromosome and its structure chromosome nucleus and chromosome

  1. One half of chromosome

  2. Haploid chromosome

  3. Complete chromosome

  4. Duplicate chromosome

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Correct Option: A
Explanation:
1) A chromatid is one-half of two identical copies of a replicated chromosome. During cell division, the identical copies are joined together at centromere. Joined chromatids are known as sister chromatids. Once the joined sister chromatids separate from one another in anaphase of mitosis, each is known as a daughter chromosome.

2) In gamete cells, the cell contains half the number of chromosomes as body cells, are called Haploid chromosomes.

3) Body cells such as muscle,skinblood etc. These cells contains a complete set of chromosomes (46 in humans),are called Diploid or complete chromosomes.

So, the correct answer is 'One half of chromosome'.

The nuclear component that contains genes which are responsible for heredity or transfer of characteristics from parents to children is/are

botany the mitotic cell cycle chromosome and its structure chromosome nucleus and chromosome

  1. the Chromosomes

  2. the Cytoplasm

  3. the Nucleolus

  4. All of the above

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Correct Option: A
Explanation:

The chromosomes are thread-like structures which can be seen enclosed in a cell nucleus. These chromosomes contain genes which are responsible for the transfer of characteristics from parents to the children.

Choose the correct statement.

botany the mitotic cell cycle chromosome and its structure chromosome nucleus and chromosome

  1. Genes are located in the chromosomes

  2. Cell is locked in the nucleus

  3. Chromosomes are located in the nucleolus

  4. Cell membrane surrounds the nucleus

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Correct Option: A
Explanation:

The chromosomes are the condensed chromatin. They are made up of DNA and proteins Those sequences of DNA that code for proteins are called the genes. 

A. Genes are the segment of DNA that is located in the chromosome. The location of a gene on a chromosome is called the locus.
B. Nucleus is an organelle present inside the cell.
C. Nucleolus is the region on chromosomes that forms the ribosomal RNA.
D. Nuclear membrane surrounds the nucleus. Cell membrane surrounds the cell.
Hence, the correct answer is 'Genes are located in the chromosomes'

Chemical composition of chromosome : 

botany the mitotic cell cycle chromosome and its structure chromosome nucleus and chromosome

  1. DNA and lipids

  2. DNA and carbohydrates

  3. Proteins and lipids

  4. DNA and proteins

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Correct Option: D
Explanation:

The chemical composition of a chromosome is DNA and proteins(histone). Because chromosome is a supercoiled structure made up by coiling of DNA on the proteins like histone

So the correct option is"DNA and Proteins".

How many sets are represented in the species with 156 chromosomes ?

botany the mitotic cell cycle chromosome and its structure chromosome nucleus and chromosome

  1. 12

  2. 78

  3. 39

  4. 19

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Correct Option: B
Explanation:

The single set of chromosome consists of half the total number of chromosomes, also called a haploid set. Here, a total of 156 chromosomes is there so one set will have 78 chromosomes.


So, the correct answer is ' B '

Chromosome have an ability of?

botany the mitotic cell cycle chromosome and its structure chromosome nucleus and chromosome

  1. Autophagosis

  2. Self-replication

  3. Self-destruction

  4. None of these

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Correct Option: A

Study of _________ helps in the determination of phylogeny and taxonomy.

botany the mitotic cell cycle chromosome and its structure chromosome nucleus and chromosome

  1. Chromosomes

  2. Cytoplasm

  3. Nucleoplasm

  4. Sarcoplasm

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Correct Option: A

Who proposed that chromosomes carried a different set of heritable elements?

botany the mitotic cell cycle chromosome and its structure chromosome nucleus and chromosome

  1. Walther Flemming

  2. Wilhelm Roux

  3. Robert Remark

  4. Virchow

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Correct Option: A