Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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What was the contribution of Rosalind Franklin to the discovery of DNA's structure?
A. X-ray diffraction images of DNA that showed that DNA had two chains twisted into a double helix with a backbone containing phosphate groups on the outside and bases on the inside
B. Theoretical model of DNA's structure and the pairing of nitrogenous bases
C. Discovery that in DNA the amounts of adenine and thymine were identical as were the amounts of guanine and cytosine
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- Models of real-world phenomena can reveal important links between structure and function in biology. Describe how the structure of DNA revealed by theWatson and Crick model suggests how it functions in living things.arrow_forwardWhat type of interaction between the base pairs serves as the "glue" to keep the two DNA strands together? O A. hydrogen bonding B. covalent bonding O C. ion-dipole interactions D. ionic bonding O E. London dispersion forcesarrow_forwardAccording to Chargaff’s rules for DNA base composition, if a DNA sample contained 10% guanine, the sample should have: A. 40% cytosine B. 90% cytosine C. 10% adenine D. 40% thyminearrow_forward
- Why is DNA replication considered semiconservative? a. One molecule consists of the old strands and the other DNA molecule is entirely new. b.Both strands of each replicating DNA molecule are new. c. One strand of each replicating DNA molecule is conserved and the other strand is newly synthesized. d.Both strands of each replicating DNA molecules are conserved.arrow_forwardWhich of the following is true about the structure of DNA as proposed by Watson and Crick (B-form DNA)? A. DNA forms a left-handed double helix. B. The strands of DNA are parallel. C. The complementary base pairs are held together by hydrogen bonds. D. A complete turn of the double helix occurs after every base pair.arrow_forwardWhich statement best describes the structure of a DNA molecule A. DNA is single-stranded and straight molecule B. DNA is a double-stranded molecule that looks like a spiral staircase C. DNA is a double stranded molecule that is straight like a ladder D. DNA is a single-stranded and curly moleculearrow_forward
- If C +T/A + G equals 0.5 in one strand, what is the ratio of these bases in the complementary strand? A. 0.25 B. 0.5 C. 1 D. 2 E. 4arrow_forwardHow did Griffiths and Avery discover that DNA was the molecule of heredity? Would we have been able to discover the structure of DNA without this work? Why or why not? Would we have been able to understand or actually try to understand DNA replication without his work? Why or why not?arrow_forwardWhat is the approximate length of a complete turn of a double helix of DNA? A. 3400 pm B. 340 pm C. 2000 pm D. 800 pmarrow_forward
- A DNA strand consists of eight pairs of nitrogenous bases. How many different sequences of eight bases can you make? Explain how you found your answer.arrow_forwardExplain to a friend the characteristics a molecule must have to function as genetic material and then explain the important features of the structure of DNA that are consistent with its role as the chemical basis of heredity.arrow_forwardIf a double stranded DNA molecule is 20% thymine, what are the percentages of all other bases? 1. Adenine 2. Guanine 3. Cytosinearrow_forward
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