Which one of the following is the correct matching of three items and their grouping category?
Items |
Group |
Malleus, incus, cochlea |
Ear ossicles |
Items |
Group |
IIium, ischium, pubis |
Coxal bones of pelvic girdle |
Items |
Group |
Actin, myosin, Rhodopsin |
Muscle proteins |
Items |
Group |
Actin, myosin, Rhodopsin |
Muscle proteins |
D.
Items |
Group |
Actin, myosin, Rhodopsin |
Muscle proteins |
There are found total five nitrogenous, bases in nucleic acids. Out of this adenine, guanine (purines) and cytosine, thymine (pyrimidines) are present in DNA, while RNA contains uracil in place of thymine (both pyrimidines) along with rest 3 similar to DNA.
Study the pedigree chart given below.
what does it show?
Inheritance of a sex-linked inborn error of metabolism like phenylketonuria
Inheritance of a condition like phenylketonuria as an autosomal recessive trait
The pedigree chart is wrong as this is not possible
The pedigree chart is wrong as this is not possible
D.
The pedigree chart is wrong as this is not possible
In the given pedigree chart, squares are representing males and circles females. In an F1 generation, 1-male and 1- female are diseased and in next generation the only male is diseased. This shows the inheritance of a recessive sex-linked disease.
select the incorrect statement from the following
Linkage is an exception to the principle of independent assortment in heredity
galactosemia is an inborn error of metabolism
small population size results in a random genetic drift in a population
small population size results in a random genetic drift in a population
D.
small population size results in a random genetic drift in a population
Baldness is not a sex -limited trait.
The linkage is an exception to the principle of independent assortment in heredity. Galactosemia is a hereditary disease that is caused by the lack of a liver enzyme required to digest galactose.
Small population size results in a random genetic drift in population.
Removal of introns and joining the exons in a defined order in transcription unit is called
splicing
tailing
transformation
transformation
A.
splicing
In some eukaryotes, genes consist of coding nucleotides sequences, which are separated from each other by blocks of non-coding sequences. The coding sequences here are called exons and non-coding sequences are called introns. The primary transcript from a typical eukaryotic gene contains introns as well as exons. The introns are removed from this primary transcript by a process called RNA splicing.
Whose experiments cracked the DNA and discovered unequivocally that is genetic code is a triplet?
Nirenberg and Mathaei
Hershey and Chase
Morgan and Sturtevant
Morgan and Sturtevant
A.
Nirenberg and Mathaei
The existence of a triplet code was simply an assumption till 1961 when Nirenberg and Methaei proved its existence by experiment. They were able to synthesise artificial mRNA, which contained only one nitrogenous base, ie, uracil. This synthetic poly-U sequence was then placed in a cell-free system containing protein synthesizing enzymes (extracted from bacterium E. coil) and 20 amino acids together with necessary ATP. During the process, a small polypeptide molecule was produced, which was formed by the linking of phenylalanine. This issuggested that UUU is code for phenylalanine. Nirenberg got Nobel Prize for his contributions.