Review the image(s) and answer the following questions.

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1		What is true about hydrogen bonds within the DNA molecule?
			A)	Hydrogen bonds hold the sugar-phosphate backbone together.
			B)	Hydrogen bonds occur within the deoxyribose molecule.
			C)	Hydrogen bonds hold the two halves of the DNA double helix together.
			D)	Hydrogen bonds are only important during the mRNA transcription process.
2		What is the proper pairing of bases within the DNA double helix?
			A)	cytosine-adenine; thymine-guanine
			B)	cytosine-guanine; adenine-thymine
			C)	guanine-adenine; thymine-cytosine
			D)	All of these are correct; base-pairing is a random process.

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3		What are the "uprights" of the DNA double helix composed of?
			A)	nucleotides
			B)	deoxyribose sugar and phosphate groups
			C)	saturated fatty acids
			D)	nitrogenous bases
4		What is the pattern of base pairing that occurs within the double helix of the DNA molecule?
			A)	cytosine pairs with guanine; thymine pairs with adenine
			B)	cytosine pairs with adenine; thymine pairs with guanine
			C)	cytosine and guanine can pair with either thymine or adenine
			D)	There is no pattern to the base pairing found in the DNA molecule.

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5		Why does blood clump when a person with blood type B receives blood from a type A donor?
			A)	The B and A cells interact.
			B)	The immune system manufactures antibodies against the A blood.
			C)	Anti-A antibodies are already in the plasma of the type B recipient.
			D)	The Rh factors are interacting.
6		Can a person with type AB blood receive blood from any donor?
			A)	Yes, in theory.
			B)	No, they have anti-A and anti-B antibodies in the blood serum.
			C)	No, because the donor blood would clump the recipient's cells.
			D)	It depends on the health of the recipient.
7		What is the role of mRNA in the translation process of protein synthesis?
			A)	to copy the "message" from DNA
			B)	to act as a template for the tRNA molecules
			C)	to assemble the growing polypeptide
			D)	All of these are correct.
8		What is the role of tRNA in the translation process of protein synthesis?
			A)	The tRNA brings a particular amino acid into place along the mRNA.
			B)	The tRNA holds the mRNA in position while the ribosome adds amino acids.
			C)	The tRNA copies the "message" from the mRNA, and then translation occurs.
			D)	The tRNA saves the "message" from the mRNA, to be used again.

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9		Where does processing of the initial transcript occur in prokaryotic cells?
			A)	within the nucleoid region
			B)	within the nucleolus
			C)	at the ribosome
			D)	There is no processing of the initial transcript in prokaryotic cells.
10		How many chromosomes are normally present in prokaryotic cells?
			A)	one
			B)	five to ten
			C)	around 20
			D)	usually 100

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11		What is the purpose in storing information in exons separated by introns?
			A)	It keeps the exons safe from infecting viral DNA.
			B)	Eukaryotes are able to then use the information in one DNA sequence in alternative ways.
			C)	It allows for multiple copies of instructions to be hidden within several chromosomes.
			D)	There appears to be no significance to this arrangement.
12		After transcription of DNA, where does processing of the initial mRNA transcript occur in the eukaryotic cell?
			A)	Processing occurs by RNA polymerase during the initial transcription process.
			B)	After transcription, enzymes process the mRNA transcript in the nucleus, removing introns.
			C)	After transcription and the mRNA transcript has been transported to the cytoplasm, enzymes process the mRNA transcript.
			D)	At the ribosome, special ribosomal enzymes process the transcript.