In molecular biology, the term DNA cloning refers to the process of
A) engineering and editing DNA for specific purposes.
B) generating many identical cells for the purpose of research.
C) generating many copies of specific DNA fragments.
D) genetically modifying and making many copies of an entire organism.
E) generating many copies of specific DNA sequences using the polymerase chain reaction.
Answer: C
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. The substance that typically provides rigidity to fungal cell walls, and is found in some animals, is
____.
a. lignin b. cellulose c. starch d. collagen e. chitin
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What will be an ideal response?
A linear strand of DNA is 1,000 bp long. A recognition sequence for the restriction enzyme Eco R1 is located 300 base pairs (bp) from the 5' end of this linear DNA molecule. Digesting this DNA molecule with Eco RI would produce ________
A) one DNA fragment, 1,000 bp long B) three DNA fragments, two of them 300 bp long and one 400 bp long C) two DNA fragments, one 300 bp long and one 700 bp long D) two fragments, each 500 bp long E) none of the above
What do we mean when we use the terms monohybrid cross and dihybrid cross?
A) A monohybrid cross involves a single parent, whereas a dihybrid cross involves two parents. B) A dihybrid cross involves organisms that are heterozygous for two characters that are being studied, and a monohybrid cross involves organisms that are heterozygous for only one character being studied. C) A monohybrid cross is performed for one generation, whereas a dihybrid cross is performed for two generations. D) A monohybrid cross results in a 9:3:3:1 ratio whereas a dihybrid cross gives a 3:1 ratio.