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Which of the following is/are correctly matched? 1. Chromosomes: Thread-like structures present in the nucleus 2. RNA: It is chemically similar to DNA but it contains ribose as its sugar and substitutes the nitrogenous base uracil for thymine.

Which of the following is/are correctly matched? 1. Chromosomes: Thread-like structures present in the nucleus 2. RNA: It is chemically similar to DNA but it contains ribose as its sugar and substitutes the nitrogenous base uracil for thymine. Correct Answer Both 1 and 2

The correct answer is Both 1 and 2.

Key Points

RNA:

  • RNA is the bridge between DNA and protein synthesis.
  • RNA is chemically similar to DNA but it contains ribose as its sugar and substitutes the nitrogenous base uracil for thymine. Hence statement 2 is correct.
    • It is single-stranded rather than a double helix.
  • To get from DNA requires two major stages, transcription and translation.
  • The process from DNA to RNA is known as Transcription.
    • During transcription, a DNA strand provides a template for the synthesis of a complementary RNA strand.
    • Transcription of a gene produces a messenger RNA (mRNA) molecule.
  • During translation, the information contained in mRNA is used to determine the amino acid sequence of a polypeptide.
    • Translation occurs at ribosomes.

Chromosomes:

  • Chromosomes are thread-like structures present in the nucleus. Hence statement 1 is correct.
  • These are nothing but DNA tightly coiled around a protein called histone.
  • Chromosomes exist in pairs.
  • Human cells contain 23 such pairs or 46 chromosomes.
  • Each chromosome is comprised of one super-long DNA molecule.
  • The DNA is coiled around histones and then many such histones are packed together to form a chromosome.

Related Questions

Consider the following statements: 1. DNA contains the sugar deoxyribose, while RNA contains the sugar ribose. 2. DNA is a double-stranded molecule, while RNA is a single-stranded molecule. 3. DNA is not stable under alkaline conditions, while RNA is stable. Which of the given above statements is/are correct? 
Consider the following statements regarding Genome Sequencing: 1. Genome sequencing is figuring out the order of DNA nucleotides, or bases, in a genome—the order of Adenine, Cytosine, Guanines, and Thymine that make up an organism's DNA. 2. Human genome is made up of 46 chromosome pairs with a total of about 3 billion DNA base pairs. 3. There are 24 distinct human chromosomes: 22 autosomal chromosomes, plus the sex-determining X and Y chromosomes. Which of the statements given above is/are correct?
Consider the following statements about the genetic materials DNA and RNA: DNA chemically is less reactive and structurally more stable as compared to RNA. DNA is better for the transmission of genetic information as compared to RNA. Both DNA and RNA can mutate. Which of the statements given above are correct?
In pseudouridine the attachment of Uracil base to ribose through ___________ of uracil.
A trader deals in sugar. He had sugar I and Sugar II. He wish to sell the mixture of both the sugar of Rs. 24. In what ratio must he mix the sugar to sell the mixture at Rs. 24, when cost of sugar I is Rs. 28 per kg and sugar II is Rs. 14 per kg.
Each passage consists of six sentences. The first (S1) and the sixth sentences (S6) are given in the beginning. The middle four sentences in each passage have been removed and jumbled up. These are labelled as P, Q, R, and S. You are required to find out the proper sequence of these sentences from the given alternatives 1), 2), 3), and 4) to form a meaningful paragraph. S1. Just how much sugar is too much? The World Health Organization (WHO) says not more than 12 teaspoons a day.  P. Doctors add that sugar naturally present in whole fruits and milk is not considered free sugars. Fruits are relatively high in natural sugar but are also high in vitamins, minerals, fibre and antioxidants.  Q. They offer more nutrients than any other food group.   R. This resulting weight gain is now being linked to higher risk of diseases from diabetes to some forms of cancer.  S. Overload of sugar in diet is known to cause weight gain.  S6. Thus, it is advisable to consume at least five servings of fruits and vegetables a day. The WHO has noted that a large amount of free sugar consumed is “hidden” in processed foods and drinks. 
Thymine is present in the place of Uracil in DNA.
The rate of sugar type A is ₹ 36.50/kg and the rate of sugar type B is ₹ 42.20/kg. We mix both type of sugar, then the rate of the mixture of sugar become ₹ 39.92/kg. What quantity of the sugar type B should be mixed with 40 kg of sugar type A?
Consider the following statements.
1. The smallest RNA is t RNA.
2. The most abundant RNA of cell is r RNA.
3. DNA can be formed over RNA through reverse transcriptase.
Which of the statements given above are false?
To pass a test, a candidate needs to answer at least 2 out of 3 questions correctly. A total of 6,30,000 candidates appeared for the test. Question A was correctly answered by 3,30,000 candidates. Question B was answered correctly by 2,50,000 candidates. Question C was answered correctly by 2,60,000 candidates. Both questions A and B were answered correctly by 1,00,000 candidates. Both questions B and C were answered correctly by 90,000 candidates. Both questions A and C were answered correctly by 80,000 candidates. If the number of students answering all questions correctly is the same as the number answering none, how many candidates failed to clear the test?