Genetics And Plant Breeding - Study Mode
[#976] RNA and DNA was synthesized in vitro by
Correct Answer
(D) Ochoa and Kornberg
Explanation
Solution: RNA and DNA were synthesized in vitro by Ochoa and Kornberg. Severo Ochoa won the 1959 Nobel Prize in Medicine after he discovered how RNA is synthesized. Kornberg was able to synthesize DNA from a variety of sources with this polymerase. Artificial DNA or RNA synthesis, a fundamental tool of synthetic biology, enables scientists to create complex NA molecules of virtually any sequence without a template. DNA synthesis occurs when these nucleotide units are joined to form DNA
this can occur artificially (in vitro) or naturally (in vivo).
[#977] DNA synthesis is takes place in which stage
Correct Answer
(C) S phase
Explanation
Solution: DNA synthesis takes place in S stage. In the eukaryotic cell cycle, chromosome duplication occurs during the "S phase" (the phase of DNA synthesis), and chromosome segregation occurs during the "M phase" (the mitosis phase). The S phase is the period of wholesale DNA synthesis during which the cell replicates its genetic content
a normal diploid somatic cell with a 2N complement of DNA at the beginning of the S phase acquires a 4N complement of DNA at its end.
[#978] During transcription the DNA site at which RNA Pol binds is called
Correct Answer
(A) Promoter
Explanation
Solution: During transcription, the DNA site at which RNA Pol binds is called Promoter. RNA polymerase and the necessary transcription factors bind to the promoter sequence and initiate transcription. Promoter sequences define the direction of transcription and indicate which DNA strand will be transcribed
this strand is known as the sense strand. A promoter is a region of DNA where RNA polymerase begins to transcribe a gene. Normally, promoter sequences are typically located directly upstream or at the 5′ ends of the transcription initiation site.
[#979] What will be left if chloroplast is burnt?
Correct Answer
(C) Magnesium
Explanation
Solution: Magnesium will be left if chloroplast is burnt. Chloroplasts are chlorophyll-containing organelles in plant cells
they play a vital role in life on Earth since photosynthesis takes place in chloroplasts. If chloroplast is burnt, then the mineral element magnesium is left while all other organic part is lost.
[#980] The bending of ovule is like a horse shoe in
Correct Answer
(A) Anatrophous
Explanation
Solution: The bending of the ovule is like a horseshoe in Anatrophous. Anatropous is a condition of having or being a plant ovule inverted so that the micropyle is bent down to the funiculus to which the body of the ovule is united. An anatropous ovule is one in which curvature during development results in the displacement of the micropyle to a position adjacent to the funiculus base
this is the most common ovule type of angiosperm and is presumed to be ancestral.