3. Two parents decide to have a child. The parents plan to have their genes tested before they have their child to see if there is a possibility of their child having sickle cell, a recessive blood disorder. The parents find out they are both heterozygous. What percentage does their child have to get sickle cell? a. 0%

b. 25%

c. 50%

d. 75%

Brian made this table to organize his notes on changes of state change of state energy change melting gain freezing lose deposition gain condensation lose

1. an enzyme is considered a(n) because it speeds up a chemical reaction without being used up.2. in a catalyzed reaction, a reactant is often called a(n) . an enzyme is specific because the shape of its matches only particular reactants.4. an enzyme speeds up reactions by lowering the . the between an active site and its substrate often strains bonds and the reaction proceed.6. a( , which is often a vitamin, binds to an enzyme and plays a role in catalysis.7. high temperatures or changes in ph can an enzyme, causing it to lose its shape and biological activity.

Which of the following statements accurately defines epidermis? a. a thick protein fiber composed of the protein collagen b. hard, dense bone tissue found on the outer surface of a bone c. single layer of epithelial cells and the underlying basal lamina d. outer, protective layer of the skin composed of stratified squamous keratinized epithelial tissue