3. Explain why the reaction of oxygen with iron is a prob-

lem, but the reaction of oxygen with aluminum is not.

Which statement is most accurate? A) All cells have the same genes, but different genes are active in different cells. B) As cells and tissues differentiate, they produce new genes.

A pea plant has purple flowers what alleles for flower color could the sex cells carry

What muscle is responsible for 75 of air movement?

A man who smokes one pack of cigarettes daily has been diagnosed with chronic bronchitis. He has been prescribed theophylline by his family doctor.

Which phrase defines a community? a. environment where nonliving things exist b group of the same species that live together cgroup of several populations living in an area d environment where living and nonliving things interact

Dna strands serve as which of the following during dna synthesis

Use the information from part c to determine how the operon is regulated for this genotype (i - p + o + z + y-).

A mutation occurs in the sex cells of a full-grown zebra. The mutation affects the genes responsible for producing blood proteins. What will most likely happen to the zebra?

Malignant tumors are classified according to A. how quickly they divide. B. how quickly they spread. C. the type of cells that give rise to them. D. the type of cells they are most likely to spread to.

Which of the following statements is TRUE about vitamin and minerals? a. Vitamin D is a water-soluble vitamin that is stored as hydroxycholecalciferol and released so that bones and teeth form normally. b.