critical data and thus played a key role in the discovery of DNA The scientist w
ID: 269661 • Letter: C
Question
critical data and thus played a key role in the discovery of DNA The scientist whose work provided a structure was a. Watson and Crick b. Gregor Mendel c. Rosalind Franklin d. Fredrick Meischer e. Hargobind Khorana 6. Muscle cells and nerve cells in one species of animal owe their differences in structure to A) Having different genes. B) Having different chromosomes C) Using different genetic codes D) Differential gene expression. E) Having unique ribosomes. 7. The polymerase chain reaction is important because it allows us to: A) insert eukaryotic genes into prokaryotic plasmids. B) Incorporate genes into viruses C) Make DNA from RNA transcripts. D) Make many copies of a targeted segment of DNA E) Insert regulatory sequences into eukaryotic genes. The following questions refer to the techniques, tools, or substances listed below. Answers may be used once, more than once, or not at all Answer the right match on your scantron respectively. A. restriction enzymes B. Primase C. miRNA D. gel electrophoresis E. Ubiquitination 8 Synthesizes RNA Molecule before DNA replication Answer: 9. Separates molecules by movement due to size and electrical charge Answer 10. Degrades mRNA molecule to regulate gene expression Answer: 11. Degrades Cyclins Answer: 12. Cuts DNA molecules at specific location or sequence AnswerExplanation / Answer
Answer5= A
Watson and crick in 1953 worked out the first correct double helix model by using x-ray photographs and awarded noble prize for that.
Important features are=
Doubke helix consists of 2 polynucleotide chains.
Two strands are anti parallel due to phosphodiester bond.
Nitrogens bases of two strands are complimentary to each others with 10 base pair per turn of helix and 3.4 nm diameter.
Answer6= D
Every cell of ur body contains same set of chromosomes containing same genes.
Genes are expressed in every cell differently depending upon the requirement of that cell.
Every cell contain same mechaniery for gene expression like same ribosomes , same genetic codon oding for same amino acids but expression of different genes in different cells.
Answer7=D
PCR stands for polymerase chain reaction consists of three steps = DENATURATION, ANNEALING, EXTENSION.
PCR mainly used in formation of millions of copies of selected DNA which is further used in diagnosis of subclinical diseases ( patient has no symptoms, and virus load is very less)
in humans.
Answer 8= B PRIMASE
primase is an enzyme required for synthesis of RNA polymerase / primers which is short sequence of RNA molecule required for starting the DNA REPLICATION.
These are required beacuse DNA polymerase itself cant start DNA REPLICATION.
ANSWER 9= D( gel.electrophoresis is used for separation of cut parts of DNA according to their size and charge)
ANSWER10=C miRNA
ANSWER 11= E ( cyclins are degraded by ubiquitinin pathway
Answer 12= A
Restriction enzymes cut the DNA moleculea at specific site and reaults in different fragmenta of DNA.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.