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Name ______________________________ Class ___________________ Date __________________ Skills Worksheet Look-Alikes DNA In the space provided, write the letter of the term or phrase that best describes how each numbered item looks. ______ 1. bacteriophage a. a twisted ladder ______ 2. bacteria capsule b. a stick drawing of a house ______ 3. replication fork c. a coated pill ______ 4. deoxyribose sugar d. a weird spaceship ______ 5. DNA molecule e. the letter Y Work-Alikes In the space provided, write the letter of the term or phrase that best describes how each numbered item functions. a. equal amounts in a recipe b. something that causes rope to fray c. hypodermic needle injection d. a computer spell-check program e. an animal that moves into a den or burrow of another animal ______ 6. bacterial transformation ______ 7. DNA polymerase ______ 8. ratio of adenine to thymine and cytosine to guanine ______ 9. helicases ______ 10. bacteriophage infecting bacteria Cause and Effect In the space provided, write the letter of the term or phrase that best matches each cause or effect given below. Cause Effect 11. phages with radioactive ______________________ a. adenine bonds only to phosphorus infected thymine bacteria b. DNA became ______________________ 12. vaccine 3 2 P-labeled 13. __________________ c. cytosine bonds only to A : T ratio is equal 14. __________________ guanine C : G ratio is equal d. protection against future infection Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Science: Biology 21 DNA Name ______________________________ Class __________________ Date __________________ Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Science: Biology 2 DNA Name ______________________________ Class __________________ Date __________________ DNA continued Linkages In the spaces provided, write the letters of the two terms or phrases that are linked together by the term or phrase in the middle. The choices can be placed in any order. 15. ______ transformation ______ 16. ______ transformation not stopped by proteindestroying enzymes _______ 17. ______ five-carbon sugar molecule ______ 18. ______ X-ray diffraction ______ 19. ______ tin-and-wire DNA model ______ 20. ______ DNA nucleotides bond to exposed bases______ a. Watson and Crick b. Avery (1944) c. DNA double-helix structure discovered d. nitrogen base e. two or three nucleotide chains f. harmless bacteria becomes harmful g. Wilkins and Franklin h. DNA is responsible for transformation i. DNA replication j. harmless R and heat-killed S bacteria are injected into mice k. DNA unwinds l. phosphate group Analogies An analogy is a relationship between two pairs of terms or phrases written as a : b :: c : d. The symbol : is read as “is to,” and the symbol :: is read as “as.” In the space provided, write the letter of the pair of terms or phrases that best completes the analogy shown. _____ 21. A : T :: a. T : C b. C : G c. C : T d. T : G _____ 22. adenine : purine :: a. guanine : pyrimidine b. cytosine : purine c. pyrimidine : purine d. thymine : pyrimidine Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Science: Biology 3 DNA Name ______________________________ Class __________________ Date __________________ DNA continued _____ 23. Wilkins and Franklin : X-ray diffraction photos :: a. Chargaff : a twisted ladder b. Mendel : nucleotides c. Watson and Crick : a tin-and-wire model d. Hershey and Chase : replication forks _____ 24. S : bacteriophage protein coats :: a. S : bacteriophage DNA b. bacteriophage DNA : S c. protein coat : P d. P : bacteriophage DNA _____ 25. Bacteriophage DNA : inside host cell :: a. host cell : inside bacteriophage DNA b. bacteriophage DNA : outside host cell c. bacteriophage protein coat : outside host cell d. bacteriophage protein : inside host cell Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Science: Biology 4 DNA Name ______________________________ Class __________________ Date __________________ Original content Copyright © by Holt, Rinehart and Winston. Additions and changes to the original content are the responsibility of the instructor. Holt Science: Biology 5 DNA