All questions of August Week 3 for NEET Exam

Current carring wire produce magnetic field

Moving electrons in conducter produce electromagnetic wave...

Helium is filled in tubes of cycles and scooters tyres
Helium is not used for filling tubes of cycles and scooters tyres. It is primarily used in other applications such as:

Argon:
- Widely used for filling incandescent electric bulbs to prevent the filament from oxidizing.
- Used in welding and metal fabrication to shield the weld area from atmospheric gases.

Neon:
- Used in safety devices for protecting electrical instruments due to its ability to produce a bright light when an electric current passes through it.
- Also commonly used in neon signs for advertising.

Radon:
- Used in radiotherapy of cancer as a radiation source to destroy cancer cells.
- It can also be used in some geological research applications to trace the movement of underground gases.
In contrast, helium is typically used in applications such as:
- Cryogenics to achieve low temperatures
- In filling balloons for various purposes
- In cooling nuclear reactors and MRI machines
Therefore, while noble gases have a variety of important uses, filling tubes of cycles and scooters tyres with helium is not one of them.

Explanation:

The correct statement is option 'C': Krypton is obtained during radioactive disintegration.

Explanation:

- Statement a: Helium has the lowest boiling point among the noble gases.
- This statement is correct. Helium has the lowest boiling point (-268.93°C) among all the noble gases. It is a colorless and odorless gas that remains in a gaseous state at room temperature and pressure.

- Statement b: Argon is used in electric bulbs.
- This statement is correct. Argon is commonly used in electric bulbs to maintain an inert atmosphere and prevent oxidation of the filament. It is an abundant noble gas and is chemically inert.

- Statement c: Krypton is obtained during radioactive disintegration.
- This statement is incorrect. Krypton is not obtained during radioactive disintegration. Krypton (Kr) is a noble gas that is chemically unreactive and does not undergo radioactive disintegration. It is obtained through the fractional distillation of liquid air.

- Statement d: Xe forms XeF6.
- This statement is correct. Xenon (Xe) can form compounds, and one of them is xenon hexafluoride (XeF6). XeF6 is a strong oxidizing agent and is used in chemical reactions and synthesis.

Therefore, the correct statement is option 'C': Krypton is obtained during radioactive disintegration. Krypton is not obtained through radioactive disintegration, but rather through fractional distillation of liquid air.

Overview of Protein Synthesis Steps
Protein synthesis is a vital biological process that involves several key steps. The correct sequence of events is crucial for accurate translation of mRNA into proteins.
Steps in the Correct Sequence
1. Charging or Aminoacylation of tRNA (iii)
- Before translation, tRNA molecules are charged with their respective amino acids by specific enzymes called aminoacyl-tRNA synthetases.
2. Attachment of mRNA and Smaller Sub-unit of Ribosome (ii)
- The small ribosomal subunit binds to the mRNA, scanning for the start codon (AUG), which signals the beginning of translation.
3. Attachment of Larger Sub-unit of Ribosome to the mRNA-tRNAMet Complex (iv)
- Once the start codon is recognized, the large ribosomal subunit attaches to form a complete ribosome, ready for translation.
4. Codon-Anticodon Reaction Between mRNA and Aminoacyl tRNA Complex (i)
- The charged tRNA with its corresponding amino acid binds to the mRNA codon through complementary base pairing between the codon and the tRNA's anticodon.
5. Linking of Adjacent Amino Acids (v)
- The ribosome facilitates the formation of peptide bonds between the amino acids brought by the tRNAs, elongating the polypeptide chain.
6. Formation of Polypeptide Chain (vi)
- As the ribosome moves along the mRNA, the polypeptide chain grows until a stop codon is reached, leading to the termination of translation.
Conclusion
The correct sequence (iii) → (ii) → (iv) → (i) → (v) → (vi) reflects the organized process of protein synthesis, ensuring that proteins are accurately synthesized based on the genetic code presented by mRNA. Thus, option 'D' is the correct answer.

In a mRNA molecule, untranslated regions (UTRs) are present at both the 5' end (before the start codon) and the 3' end (after the stop codon). The correct answer is option 'C'.

Explanation:
mRNA (messenger RNA) is a single-stranded RNA molecule that carries the genetic information from DNA to the ribosomes, where it serves as a template for protein synthesis. It contains several regions, including the coding region and the untranslated regions (UTRs).

1. Untranslated Regions (UTRs):
- Untranslated regions (UTRs) are the regions at the ends of the mRNA molecule that are not translated into protein. They are located both at the 5' end (before the start codon) and the 3' end (after the stop codon) of the mRNA molecule.
- UTRs play important regulatory roles in gene expression by influencing the stability, localization, and translation efficiency of the mRNA molecule.
- The 5' UTR, also known as the leader sequence, is present at the beginning of the mRNA molecule. It contains regulatory elements such as the Kozak sequence, which is involved in the initiation of translation.
- The 3' UTR, also known as the trailer sequence, is present at the end of the mRNA molecule. It contains regulatory elements such as binding sites for microRNAs and RNA-binding proteins, which can control mRNA stability and translation.

2. Coding Region:
- The coding region of mRNA contains the nucleotide sequence that encodes the amino acid sequence of a protein. It is located between the start codon (usually AUG) and the stop codon (UAA, UAG, or UGA).
- During translation, the ribosomes read the codons in the mRNA molecule and assemble the corresponding amino acids to form a protein.

In conclusion, untranslated regions (UTRs) are present at both the 5' and 3' ends of an mRNA molecule. They play important regulatory roles in gene expression by influencing mRNA stability, localization, and translation efficiency.

The given reaction is incomplete. Please provide the missing reactant or product in order to complete the reaction.

Role of tRNA in Protein Synthesis
During protein synthesis, the translation process requires the transportation of amino acids to the ribosome, where they are assembled into proteins. The molecule responsible for this critical function is transfer RNA (tRNA).
What is tRNA?
- tRNA is a type of RNA that serves as an adaptor molecule in protein synthesis.
- It has a unique structure with an anticodon region that pairs with the corresponding codon on the messenger RNA (mRNA).
- Each tRNA molecule is specific to one amino acid, which it carries to the ribosome.
Function of tRNA
- Amino Acid Transport: tRNA transports amino acids from the amino acid pool in the cytoplasm to the ribosome.
- Codon Recognition: The anticodon on tRNA matches with the codon on mRNA, ensuring the correct amino acid is incorporated into the growing polypeptide chain.
- Peptide Bond Formation: Once the correct tRNA is in place at the ribosome, the amino acid it carries is added to the nascent protein via peptide bonds.
Importance in Translation
- tRNA is essential for translating the genetic code carried by mRNA into a specific sequence of amino acids.
- Without tRNA, the ribosome would not be able to correctly interpret the mRNA sequence, resulting in nonfunctional or incorrectly formed proteins.
In summary, tRNA plays a vital role in translating the genetic information from mRNA into functional proteins by transporting the necessary amino acids during protein synthesis. Thus, the correct answer to the question is option 'C' - tRNA.