(i) Why RNA is not a suitable genetic material in comparison with DNA ? Explain.
(ii) Monocistronic structural genes in eukaryotes have interrupted coding sequence. Explain. How are they different in prokaryotes.

Read the following statements and select the corect ones. i. Monocistronic structural genes in eukaryotes have uninterrupted coding sequences, ii. Coding sequences of a gene are called exons.iii. There is a single DNA-dependent RNA polymerase that catalyses transcription of all types of RNA in bacteria.iv. In eukaryotes, RNA polymerase.. lll is responsible for the transcription of 28S rRNA

Explain the process to transcription in prokaryotes .How is the process different in eukaryotes ?

Assertion :- The split-gene arrangement complicates the definition of a gene in terms of a DNA segment. In eukaryotes the monocistronic structural genes have interrupted coding sequence.

(a) Why is DNA molecule a more stable genetic meterial then RNA ? Explain. (b) " Unambiguous"," degenerate" and "universal" are some of the salient featuresn of genetic code. Explain.

(a) Why is DNA molecule a more stable genetic meterial then RNA ? Explain. (b) " Unambiguous"," degenerate" and "universal" are some of the salient featuresn of genetic code. Explain.

During the course of evolution why was DNA was chosen over RNA as genetic material? Give reasons by first discussing the desired criteria in a molecule that can act as genetic material and in the light of biochemical differences between DNA and RNA.

During the course f evolution why DNA was choosen over RNA as genetic material. Give reasons by first discussing the desired criteria in a molecule that can act as genetic meterial and in the light of biochemical differences between DNA and RNA .

Read the below Statements about the structure of genetic material and identify the correct ones. I. Adenine and guanine are bases that have a double ring structure , cytosine, thymine and uracil are based with a single ring structure . II. An adenine nucleotide from DNA is the same as an adenine nucleotide from RNA , DNA adenine pairs with uracil and RNA adenine pairs with thymine. III. The base pairing that occurs in a double DNA helix and when RNA is synthesised during transcription follows the rule that a purine pairs with a pyrimidine. IV. The two Polynucleotides on a DNA molecule run in opposite directions so that the double helix formed has two strands that are anti-parallel to each other.

(a) A mobile phone lies along the principal axis of a concave mirror. Show, with the help of a suitable diagram, the formation of its image. Explain why magnification is not uniform. (b) Suppose the lower half of the concave mirror's reflecting surface is covered with an opaque material. What effect this will have on the image of the object? Explain.

Given below are diagrams showing the different stages in the process of fertilisation of an egg in the human female reproductive tract. Study the diagrams and answer the questions (i) Arrange the letters given below each diagram in a logical sequence to show the correct order in the process of fertilisation. (ii) Where does fertilisation normally take place? What is 'Implantation' that follows fertilisation ? (iii) Mention the chromosome number of the egg and zygote in humans. (iv) Explain the term 'Gestation'. How long does Gestation last in humans ? (v) Draw a neat, labelled diagram of a mature human sperm.