HSC Science (General) 12th Standard Board Exam - Maharashtra State Board Important Questions for Biology

Define Aneuploidy.

A pea plant homozygous for yellow round seed is crossed with its recessive parents. Calculate the phenotypic and genotypic ratio with the help of a checkerboard.

What are chromosomal disorders?

Describe Turner's syndrome.

Describe Klinefelter’s syndrome.

Which one of the following is a stop codon?

(a) UAG

(b) UAC

(c) AUG

(d) UCA

What is Anticodon?

How CO₂ makes idlies puffy?

Give diagrammatic representation to show a perfect pairing and any ‘two’ Wobble pairings.

In which of the following haploid cells a whole genome in human being is present?

1. sperm
2. somatic cell
3. mature RBC
4. primary spermatocyte

What does abbreviation HGP stand for?

If the codon on m-RNA is AUG, the compatible anticodon on t-RNA is _______.

What is the correct sequence of the stages in bacteriophage lytic cycle?

(A) Attachment, Penetration, Lysis, Multiplication

(B) Attachment, Penetration, Multiplication, Lysis

(C) Lysis, Penetration, Multiplication, Attachment

(D) Attachment, Lysis, Multiplication, Penetration

Explain the semi-conservative replication of eukaryotic DNA.

Explain replication of bacteriophage with the help of a suitable diagram.

What is 'RNA'?

Explain different types of non-genetic RNA with diagrams and functions.

The number of adenine molecules in a given DNA segment is 25 and the number of cytosine molecules is 45, the total number of nucleotides in the segment is _______________.

Give the central dogma of protein synthesis.

The pairing of homologous chromosomes is call______

(a) crossing over

(b) terminalization

(c) synapsis

(d) bivalent