13. The only taxon that actually exists as a natural unit is the
(A) class.
(B) family.
(C) genus.
(D) phylum.
(E) species.

9. Which colors are absorbed by chlorophyll? (A) violet, blue and red (B) violet, green and red (C) blue, yellow and red (D) violet, blue and orange (E) blue, green and red

10. The sodium-potassium pump is termed electrogenic because (A) it hydrolyzes ATP. (B) it pumps positive charges out of the cell and negative charges into the cell. (C) it pumps three positive charges out of the cell for every two positive charges it pumps into the cell. (D) it pumps H+ out of the cell along with Na+. (E) it pumps electrons into the cell.

11. Most of the zygotic segmentation genes code for (A) special transfer RNA. (B) enzyme. (C) transcription factors. (D) histones. (E) transport proteins.

12. Most CO2 from catabolism is released during (A) glycolysis. (B) lactate fermentation. (C) the Krebs cycle. (D) electron transport. (E) oxidative phosphorylation.

14. The organisms in your backyard include trees, shrubs, grass, ants, mushrooms, birds, spiders, beetles, flies, and bacteria. Together, all these organisms make up (A) an ecosystem. (B) a community. (C) a population. (D) an ecosociety. (E) an experimental group.

15. The main contributing factor to the release of CFC’s is (A) decomposition in land fills. (B) acid rain. (C) emission from feedlots. (D) leaking refrigerators and air conditioners. (E) burning of tropical forests.

16. Lipids are absorbed by the ___ system. (A) urinary (B) blood vascular (C) reproductive (D) respiratory (E) lymphatic

17. The diploid sporophyte stage is dominant in the life cycles of all of the following except (A) a fern. (B) a moss. (C) a pine tree. (D) a dandelion. (E) a rose bush.

18. Which of the following is not a part of lichens? (A) fungi (B) green algae (C) brown algae (D) cyanobacteria (E) both C and D

19. Mark found an organism in a pond, and he thinks it’s a freshwater sponge. His friend Ralph thinks it looks more like an aquatic fungus. How can they decide whether it is an animal or a fungus? (A) See if it can swim. (B) See if it is a eukaryote or a prokaryote. (C) Look for cell walls under a microscope. (D) Determine whether it is unicellular or multicellular. (E) Figure out whether it is autotrophic or heterotrophic.