multiple choice questions on dna structure and function

Question 1 - Question: Almost the entire mass of an atom is concentrated in the__________. 1. proton 2. electrons 3. nucleus 4. neutrons Answer:..

. Hence, such secondary constrictions are called as nucleolar organizers. fig. 19.3 Structure of Chromosomes The terminal end of a chromosome is called as telomere. It is functionally different from the rest of the chromosome. A chromatid may breakup into pieces and the pieces m..

1. Iron is a constituent of cytochromes, ferredoxin, nitrogenase, catalase peroxidase, hematin etc. 2. Essential for the development of chloroplast and chlorophyll. 3. Many of iron containing enzymes take part in electron transfer in both photosynthesis and respiration. 4. Structure of po..

The stages of evolution in species certainly did not happen by a single DNA change like the change of colour in the eye. Complex organs as multiple limbs or adaptation in the pentadactyl limb for different functions were created bit-by-bit over many, many, generations...

>General structures and functions of DNA, RNA, and protein Base-pairing rules to explain precise copying of DNA during semi-conservative replication Transcription of information from DNA into mRNA Genetic engineering (biotechnology) - production of ..

>General structures and functions of DNA, RNA, and protein Base-pairing rules to explain precise copying of DNA during semi-conservative replication Transcription of information from DNA into mRNA Genetic engineering (biotechnology) - production of ..

fig. 19.2 - Bacterial Chromosome In addition to the nucleoid, a bacterial cell may show the presence of extra chromosomal DNA molecules called plasmids. Like the bacterial chromosome, plasmids are double stranded circular DNA molecules which can replicate and function ..

>Peptiglycons are found in the cell walls of prokaryotic cells. Proteins are polymers of aminoacids arranged in a specific sequence which is decided by the genetic code present in the DNA molecule. The polypeptide chain in a protein may be straight (primary structure) or may for..

: Various structural genes involved in a particular metabolic pathway are often not located adjacent to one another. They usually occur far apart on the same or even different chromosomes. The structural gene has coding and non-coding segments called exons and introns respective..

. The membrane encloses a clear fluid matrix called nucleoplasm or karyolymph. It encloses a fine network of thread-like structures, called chromatin network. It is composed of chromatin that contain DNA and histones arranged in a specific manner. The chromatin condenses to form..