Multiple Choice QuestionsA sequential expression of a set of human genes occurs when a steroid molecule binds to the
transfer RNA
messenger RNA
DNA sequence
DNA sequence
Which antibiotic inhibits interaction between t-RNA and m-RNA during bacterial protein synthesis?
Erythromycin
Neomycin
Streptomycin
Streptomycin
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.
Amino acid sequence, in protein synthesis is decided by the sequence of
t-RNA
m-RNA
c-DNA
c-DNA
Antiparallel strands of a DNA molecule means that
one strand turns anti-clockwise
the phosphate groups of two DNA strands, at their ends, share the same position
the phosphate groups at thestart of two DNA strands are in opposite position (pole)
the phosphate groups at thestart of two DNA strands are in opposite position (pole)
The final proof for DNA as the genetic material came from the experiments of
Griffith
Hershey and Chase
Avery, Mcleod and McCarty
Avery, Mcleod and McCarty
Which of the following are not polymeric?
Nucleic acids
Proteins
Polysaccharides
Polysaccharides
The association of histone H1 with a nucleosome indicates:
Transcription is occurring
DNA replication is occurring
The DNA is condensed into a Chromatin Fibre
The DNA is condensed into a Chromatin Fibre
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