Biology Second Semester Exam Review

In humans, where does DNA replication take place?

• Cytoplasm

• Nucleus

• Ribosome

• Vacuole

RNA from a bear is compared to RNA from a sunflower. Both will contain the

• sugar deoxyribose and the base thymine.

• sugar deoxyribose and the base uracil.

• sugar ribose and the base thymine.

• sugar ribose and the base uracil.

A scientist is doing an experiment to identify different molecules. Some components of these molecules are listed in this table. Which of the four molecules is DNA, based on the table to the right?

• Molecule 1

• Molecule 2

• Molecule 3

• Molecule 4

The diagram shown here represents a portion of a nucleic acid molecule. The part indicated by the arrow could be

• adenine.

• uracil.

• deoxyribose.

• phosphate.

A DNA nucleotide could contain the following molecules:

• deoxyribose, cytosine, and a lipid.

• deoxyribose, thymine, and a phosphate group.

• ribose, uracil, and a polypeptide.

• ribose, adenine, and thymine.

Use the diagram to the right AND your knowledge of biology to answer this question. Structures 3 and 4 are held together by

• weak peptide bonds.

• strong hydrogen bonds.

• weak hydrogen bonds.

• strong peptide bonds.

In nucleotides, the letters A, G, C, and T represent

• phosphate groups.

• deoxyribose sugars.

• nitrogen bases.

• ribose sugars.

The cellular process of creating two new DNA molecules from one original copy is called replication. Which statement is the BEST description of this process?

• DNA opens up and RNA copies it.

• DNA opens up and completely unwinds to make two new molecules.

• DNA opens up and each strand is used as a template for making a new strand.

• RNA opens up the DNA and uses each strand as a template for a new strand.

The molecule copied directly from DNA is represented by number.

• 1

• 2

• 3

• 4

What is an example of a molecule produced by the process shown above?

• Glucose

• Glycogen

• A fatty acid

• A polypeptide

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