Question

1.A The mRNA sequence below is the full length of the mature mRNA transcript. On the sequence, the 5'cap is indicated by (5'). The poly (A) tail is not shown. This transcript arrives at a ribosome. Determine the anticodon sequence for the first three tRNA used to make the polypeptide. Label the 5’and 3’ends on the tRNAs. 5' AAUCGAUGUAAUCCGCAUC 3'

Answer 1

Question 1(B) -

ANSWER- Hydrolysis reactions removes monomers from polymer they do so by adding a water molecule.

Explanation -

• hydrolysis is a chemical reaction in which a molecule is breakdown into many parts by the addition of molecule of water.
• Example - conversion of starch into glucose.
• Polymer are breakdown into monomers by hydrolysis reaction.

Question 1(c) -

Answer - Monomers of proteins are Amino acid and the monomers of nucleic acid are Nucleotide.

Explanation -

Amino Acid -

• Proteins are polymer of amino acid.
• There are approximately 300 amino acid known to exist but only 20 amino acids are used in formation of proteins.
• Amino acid contain an side chain which is differ in evey amino acid.
• Amino acid contain an carboxyl group and an amino group.
• Amino acids are joined with peptide bond to form proteins.

Nucleotide -

• nucleic acids are polymer of nucleotide.
• Nucleotide contains a nitrogen base ,pentose sugar and phosphate group.

Question 1(D) -

Answer- New DNA can only be made in the 5' to 3' direction.

Explanation-

• DNA is the only molecule capable of self duplication so it is termed as living molecule.
• DNA replication takes place in s phase of cell cycle.
• Following steps are included in DNA replication
• (1)Unzipping - it is also called as unwinding. The separation of two chains of DNA is termed as unzipping.
• (2) Formation Of New Chain - to start the synthesis of new chain, special type of RNA is required which is called as RNA primer.
• The formation of new chain of DNA is always takes place in 5'-3' direction.

Question 1(G) -

Answer - the wrong statement is - meiosis results in two daughter cells for one parent cell, mitosis results in four daughter cell from one parent cell.

The correct statement for this - meiosis results in four daughter cell for one parent cell, mitosis results in two daughter cell from one parent cell .

Explanation -

the below diagram give difference between mitosis and meiosis.

Mitorix mitorix occurx in comatic cell Meiorix It occur in reproductive Cellxo • Both diploid and haploid celle show mitoare Meioxic yound only diploid cells It ic a double divirion. • It ik a Kingle le division • mitorix produce a two daugther celle from one meiokik produce your celle from one parent cell. Parent cello • It doex not Introduced Variation gene exo it introduced warration due to exchange. It involved in in only sexual reproduction. • It ik required for growth, repair and hea healing cy to kinerie cytokinerik mitorix recrulta in identical cells. meiorik recrutte in half of the genetre materjal in the daugther cell ax parent cell, due to variation