<¿y Standardized Test Preparation

DIRECTIONS: Choose the letter of the answer choice that best answers the question.

1. Which of the following codes for a repressor protein?

A. enhancer

B. promoter

C. regulator gene

D. structural gene

2. Which component of an operon controls the advancement of RNA polymerase?

F. exon

G. operator

H. promoter

J. structural gene

3. Pre-mRNA contains which of the following?

A. exons only

B. introns only

C. both introns and exons

D. neither introns nor exons

INTERPRETING GRAPHICS: The graph below shows the number of cigarettes smoked per capita per year between 1920 and 2000 and the annual incidence of lung cancer among women. Use the graph to answer the question that follows.

Cigarette Smoking and Lung Cancer in Women

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