In which mode of inheritance do you expect more maternal influence among the off spring?
Autosomal
Cytoplasmic
Y-linked
Y-linked
B.
Cytoplasmic
The more maternal influence can be expected in the cytoplasmic inheritance (i.e. the inheritance of genes contained in the cytoplasm of a cell, rather than the nucleus. The reason is that the female reproductive cell or the egg has a large amount of cytoplasm containing many such organelles which contain their own genes and can reproduce independently (e.g., mitochondria and chloroplast) and which are consequently incorporated into the cytoplasm of all the cells of the embryo. The male reproductive cells (sperm or pollen) consist almost solely of a nucleus. Cytoplasmic organelles are thus, not inherited from the male parent.
This is why, the cytoplasmic inheritance is also called maternal inheritance.
Genes located on Y-chromosome are called Y-genes and their inheritance is called Y-linked inheritance. This carries the paternal influences.
A gene located in the X-chromosomes is said to be X-linked and its inheritance is called X-linked inheritance. In this, a male transmits his X-chromosome only to his daughters while a female transmits one of her X-chromosomes to the offspring of both sexes.
Which antibiotic inhibits interaction between t-RNA and m-RNA during bacterial protein synthesis?
Erythromycin
Neomycin
Streptomycin
Streptomycin
D.
Streptomycin
Tetracyclin interfere with the attachment of t-RNA carrying the amino acid to the m-RNA-ribosome complex preventing the addition of amino acids to the growing polypeptide chain. Streptomycin interfere with the initial steps of protein synthesis by changing the shape of 30S portion of 70S prokaryotic ribosome.
Erythromycin refers with 50S portion of the 70S prokaryotic ribosome.
A sequential expression of a set of human genes occurs when a steroid molecule binds to the
transfer RNA
messenger RNA
DNA sequence
DNA sequence
C.
DNA sequence
The steroid hormone receptor protein complex activate transcription of target gene by binding to specific DNA sequence.
The Okazaki fragments in DNA chain growth
result in transcription
polymerize in the 3’ - to - 5’ direction and forms replication fork
prove semi-conservative natuire of DNA replication
prove semi-conservative natuire of DNA replication
A.
result in transcription
The Okazaki fragments in DNA chain growth polymerize in the 5' - to -3' direction. The replicated DNA results in transcription.
The two polynucleotide chains in DNA are
parallel
discontinuous
antiparallel
antiparallel
C.
antiparallel
In 1953 James Watson and Francis Crick suggested that in a DNA molecule there are two polynucleotide chains arranged antiparallel or in opposite directions.