Rosalind franklin is famous for which contribution to the study of dna?
a. creation of an accurate model of dna structure
b. creation of an x-ray diffraction image of dna structure
c. identification of a pattern in ratios of dna bases
d. identification of dna in bandages that contained pus

The correct answer is   B) Creation of an X-ray diffraction image of DNA structure.

Rosalind Franklin made a significant contribution in the discovery of DNA double helical structure and X ray diffraction image of DNA. Her study on X ray diffraction provided clues for the discovery of the structure of DNA.

Through X ray diffraction, Rosalind Franklin created a beautiful  image of DNA ( phot 51 that was a picture of B form of DNA) that helped Watson and Crick in discovering the structure of DNA.

a. as the temperature increases, the kinetic energy of the gas molecules increases & the molecules move faster & further away from each other.

b. if you decrease the temperature of a fixed amount of gas at constant pressure, the combined gas law reduces to charles's law. in this case, volume will also decrease.

step 1: initiation

initiation is the beginning of transcription. it occurs when the enzyme rna polymerase binds to a region of a gene called the promoter. this signals the dna to unwind so the enzyme can ‘‘read’’ the bases in one of the dna strands. the enzyme is now ready to make a strand of mrna with a complementary sequence of bases.

step 2: elongation

elongation is the addition of nucleotides to the mrna strand. rna polymerase reads the unwound dna strand and builds the mrna molecule, using complementary base pairs. there is a brief time during this process when the newly formed rna is bound to the unwound dna. during this process, an adenine (a) in the dna binds to an uracil (u) in the rna.

step 3: termination

termination is the ending of transcription, and occurs when rna polymerase crosses a stop (termination) sequence in the gene. the mrna strand is complete, and it detaches from dna.