“Learn about chromosomes and DNA, exploring their structure, function, and crucial role in heredity and genetic information transmission.”
Chapter 6 Biology Class 12 MCQs
The Syndrome which is an example of trisomy of the sex chromosome is: Klinefelter’s syndrome
In incubating eggs artificially the incubators are usually regulated at temperature between: 36 – 38oC
For maximum growth the optimum temperature is 25 – 30oC and it least at: 5 – 10oC
From Hensen’s node,dorsal mesoderm is formed and is organized into: Somitcs
On the basis of structure and shape of the cap,two species of Acetabularia have been identified: A.crenulata & A.arabica
In addition to auxin which hormone also play important role in apical domince: Cytokinins
in plants regeneration is the basis of plant: Reptiles
Primary tissue is added by the: Apical meristem
Which one of the following condition is resulted from excess GH in adults: Acromegaly
If lobster loses its pincer claw a new claw: Regenerates
Deficiency of vasopressin or ADH by the pituitary gland leads to a disorder in which the patients kidney have lessoned ability to absorb water is: Diabetes insipidus
An ordered sequence of irrversible steps with each step setting up the necessary conditions for the next step is: Development
Which of the following hormones is not released by the anterior pituitary: Melanocyte – releasing hormone
Which prosess is characterized by movement and rearrangement of cells in the embryo: Gastrulation
In the chick the mesodermal cells migrate and caudally from both sides and create a mid line thickening called: Primitive streak
Parathyroid hormone acts to ensure that: Calcium levels in the blood never drop too low
In humans ,MSH(melanocyte-stimulating hormone): Regulates primary skin color
During elongation the cell volume increase up to 150 fold due to uptake of: Water
A plant has a growth pattern called: Open growth
The negative physiological changes in our body are said to be: Agning
Clear cytoplasm produces: Larval epidermis
In chordates the healing of fracture and repair of a skin wound are some other examples of: Regeneration
_______ regulates the kidney’s retention of water: Vasopressin (ADN)
Oxytocin is secreted by the endocrine gland named: Pituitary gland
The addrenaline cortex produces: Aldosterone
The genetic code for glycine is: GGU
The stand which elongates towards the replication fork is: Leading
Morphological characteristics of chromosome are collectively called: Karyotype
In 1953, F . Sanger described the sequence of amino acids of: Insulin
Repeating units of DNA are called: Nucleotides
In sickle cell anemia code for glutamic acid is replaced by: Leucine
DNA was discovered in: 1869
Every 200 nucleotides the DNA duplex is coiled around a core of eight histone proteins forming a complex known as a: Nucleosome
Adenine and guanine are called: Purines
Walter Fleming first discovered chromosomes in the dividing cells of: Salamander larvae
Important : Review all previous years’ 12 class past papers for comprehensive practice and better exam preparation.