5. What circulatory diseases are caused by atherosclerosis, diabetes, high blood pressure and gender (more common in males).
A. stroke
B. heart attack
C. Atherosclerosis
D. Hypertension

6. What is the relationship among DNA, a gene, and a chromosome?
A. A chromosome contains hundreds of genes, which are composed of DNA. B. A chromosome contains hundreds genes, which are composed of protein. C. A gene contains hundreds of chromosomes, which are composed of protein.
D. A gene is composed of DNA, but there is no relationship to a chromosome.

7. Which sequence of DNA bases would pair with this partial strand: ATG TGA CAG?
A. GTA AGT GAC
B. TAC ACT GTC
C. CAT TCA CTG
D. ATG TGA CAG

8. Which of the following theories does NOT explain the chromosomal basis of inheritance?
A. Genes are located in the chromosomes.
B. Chromosomes and their related genes undergo segregation during meiosis C. Mendel's laws of inheritance do not relate to the behavior of chromosomes in meiosis.
D. Chromosomes and their related genes undergo independent assortment in the formation of gametes.

9. Which of the following is the major cause of wildlife depletion?
A. pollution
B. overfishing
C. deforestation
D. eutrophication

10. Trees in the forest compete for limited resources like space, sunlight and soil nutrients. Some small plants like grasses and shrubs can't grow well therefore, population decreases. Which limiting factor greatly affects the population of grasses and shrubs in the forest ecosystem?
A. space
B. sunlight
C. altitude
D. soil nutrients​