Watson and Crick's DNA model by hydrogen bonds se a spiral staircase ating phosphate and nkages (Figure 7-8b). ain is organized. As umbered 1' through one deoxyribose to gar-phosphate back- tanding this polarity FIGURE 7-7 James Watson and Francis Crick with their DNA model. [A. Barrington Brown/Science Source]

In Noll’s experiment , explain where DNase I cuts the DNA. Why were the bands on the gel in multiples of 200 bp at lower DNase I concentrations?

The technique of dideoxy sequencing of DNA is described inChapter 20. The technique relies on the use of dideoxyribonucleotides(shown in Figures 20.5 and 20.16). A dideoxyribonucleotidehas a hydrogen atom attached to the 3′-carbon atom insteadof an –OH group. When a dideoxyribonucleotide is incorporatedinto a newly made strand, the strand cannot grow any longer.Explain why.

Two amino acids in the chain are different colors than the rest. Based on how the polypeptide moves, do you think they are (hydrophobic or hydrophilic)? Circle your answer.

The amount of DNA inintronic regionof genes can be grwater than the amount of DNA in exons. true

On further analysis of the DNA described in conceptual questionC21, you discover that the triplex DNA in this alien organism iscomposed of a double helix with a third strand wound within themajor groove (just like the DNA in Figure shown). How would youpropose that this DNA is able to replicate itself? In your answer,be specific about the base-pairing rules within the double helixand which part of the triplex DNA would be replicated first.

Genetics Attached is a segment of DNA (doublestranded). Answer the following questions about the segment of DNA: How many open reading frames (ORF) are in this sequence? How many amino acids are encoded in all open reading frames in this segment/sequence? Which strand is the template strand for the longest open reading frame?

The top side of this figure offers more opportunities (for each base pair) that can lead to highly specific protein-DNA interactions. True or False? Major groove Major groove (a) Major groove Major groove O True N-HI110 O False A NIIH-N Minor groove Adenine-Thymine CH3 0111H-N H₂C OFITH 98 TN- GN-HIIN V-HillO Minor groove Guanine Cytosine Minor groove Thymine-Adenine Hillo C NIH OIH -NG Minor groove Cytosine Guanine

Write the complementary sequence of DNA AGCTAT AGC

wol for Frayon Elolog - Meet - cha-gX-m sc Jupiter Ed G Which orgerell= A sample of DNA is collected from an organism. It is analyzed and determined that 20% of the DNA is made up of the base adenine. Based on this information, which of the following correctly lists the amounts of the three. remaining bases for this sample? 10% cytosine, 30% thymine, 40% guanine O 20% cytosine, 20% thymine, 20% guanine 30% cytosine, 30% thymine, 20% guanine 30% cytosine, 20% thymine, 30% guanine p. 5 of 31