Practice free Botany NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
The length of DNA molecule greatly exceeds the dimensions of the nucleus in eukaryotic cells. How is this DNA accommodated?
In eukaryotic cells, DNA accommodated by super-coiling in nucleosomes.
During transcription RNA polymerase holoenzyme binds to a gene promoter and assumes a saddle-like structure. What is it’s DNA-binding sequence?
TATA box is present in eukaryotic promoter region. It has a resemblance with pribnow box of prokaryotes. TATA box was identified by Dr. Hogness and so, it is called as Hogness box. It is a 7 bp long region located 20 bp upstream to the start point. During the process of transcription the RNA polymerase (a holoenzyme which has a core unit and a sigma factor for proper initiation of transcription) binds to TATA box due to which DNA assumes a saddle like structure at this place.
Differentiation of organs and tissues in a developing organism, is associated with:
Differentiation of organs and tissues in a developing organism, is associated with differential expression of genes. In regulation of gene expression the chromosomal proteins play important role. The chromosomal proteins are of two types histones and non-histones. The regulation of gene expression involves an interaction between histones and non-histones.
The two polynucleotide chains in DNA are:
In 1953 James Watson and Francis Crick suggested that in a DNA molecule there are two polynucleotide chains arranged antiparallel or in opposite directions.
A sequential expression of a set of human genes occurs when a steroid molecule binds to the:
The steroid hormone receptor protein complex activate transcription of target gene by binding to specific DNA sequence.
Which antibiotic inhibits interaction between t-RNA and m-RNA during bacterial protein synthesis?
Tetracycline inhibits the interaction between tRNA and mRNA. Thus, prevents protein systhesis.
Amino acid sequence, in protein synthesis is decided by the sequence of
In the process of protein synthesis, the messenger RNA (m-RNA) is responsible for carrying the genetic code transcribed from DNA to specialized sites within the cell (called ribosomes) where the information is translated into protein composition. The sequence of amino acids in a particular protein is determined by the sequence of nucleotides in m-RNA.
Sequence of t-RNA, c-DNA or r-RNA do not decide the amino acid sequence in protein synthesis.
One gene-one enzyme hypothesis was postulated by:
(d) 'One gene-one enzyme' hypothesis was given by Beadle and Tatum (1948) which states that particular gene controls the synthesis of specific enzyme. Later, it was modified to 'one gene-one polypeptide hypothesis by Yanofsky et.al. (1965).
Antiparallel strands of a DNA molecule means that:
J.D. Watson and F.H.C. Crick (1953) showed that DNA has a double helical structure with two polynucleotide chains connected by hydrogen bonds and running in opposite directions (antiparallel). The antiparallel strands of a DNA molecule means that the phosphate groups at the start of two DNA strands are in opposite position (pole).
Complete genomic sequence of the following plant has been recently announced is
Scientists finished the first genetic sequence of a plant, that of the weed Arabidopsis thaliana, in December 2000. It is called Drosophila of plant kingdom.
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