10. Which of the following biomes is characterized by mild, rainy winters and hot, dry summers?
(A) Tropical forest
(B) Temperate grassland
(C)Savanna
(D) Temperate seasonal forest
(E) Mediterranean woodland and shrubland

6. Homeostasis (A) is the maintenance of a relatively constant internal state. (B) results from hormone imbalance. (C) occurs when the external environment changes to match the internal environment. (D) is the way the internal environment influences the external environment.

7. The second vaccination is beneficial because it (A) contains mast cells that survive longer than 4-5 days. (B) stimulates production of a higher concentration of antibodies in the bloodstream. (C) requires two injections to stimulate antibody formation. (D) keeps previously produced cytotoxic T cells circulating in the bloodstream.

8. Our biological clock, which regulates the sleep-wake cycle, is housed within the (A) cerebrum. (B) hypothalamus. (C) cerebellum. (D) brainstem.

9. Which statement regarding compound eyes is TRUE? (A) They have one light-focusing lens. (B) They are poor motion detectors. (C) They can provide excellent color vision. (D) They can perceive only visible light.

11. A child dies following a series of chronic bacterial infections. At the autopsy, the physicians are startled to see that the child's white blood cells are loaded with vacuoles containing intact bacteria. Which explanation could account for this finding? (A) A defect in the Golgi apparatus prevented the cells from processing and excreting the bacteria. (B) A defect in the rough endoplasmic reticulum prevented the synthesis of the antibodies (defensive proteins) that would have inactivated the bacteria. (C) A defect in the cell walls of the white blood cells permitted bacteria to enter the cells. (D) A defect in the lysosomes of the white blood cells prevented the cells from destroying engulfed bacteria.

12. Two chromosomes in a nucleus that carry genes controlling the same inherited characteristics are (A) homologous chromosomes. (B) sister chromatids. (C) complementary chromosomes.

13. Why is a guide RNA needed when using CRISPR-Cas9 for gene editing? (A) to help Cas9 be transported into the nucleus (B) to help Cas9 find the target DNA to cut (C) to help repair the target DNA after it is cut (D) to help make copies of the target DNA

14. In mammals, the presence of four limbs is______， and hair is_______. (A) a shared derived character； a shared ancestral character that places mammals in the tetrapod clade (B) a shared ancestral character； a shared derived character unique to mammals (C) a homologous feature； an analogous feature (D) monophyletic； parsimonious

15. Which plant has a dominant sporophyte generation and a seed, but no fruit? (A)fern (B) pine tree (C) tulip (D) moss

16. Which statement about metabolism is FALSE? (A) The basal metabolic rate is the amount of energy an animal needs just to stay alive； it does not include the energy needed for activities. (B) Cells usually use carbohydrates and fats as fuel sources. (C) Humans store some extra energy in the forn of glycogen reserves in the pancreas and spleen. (D) The average basal metabolic rate is 1,300-1,500 kcal per day for females and 1,600-1,800 kcal per day for males.