6. Oxygen crosses a plasma membrane by
(A) osmosis.
(B) active transport.
(C) pinocytosis.
(D) passive transport.
(E) receptor mediated endocytosis.

2. Collections of neuronal cell bodies in the central nervous system are called: (A) Ganglia (B) Neuroglia (C) Nodes (D) Nuclei (E) White matter

3.______connect the intermediate filament system of two adjacent epithelial cells. (A) Adherent junctions (B) Desmosomes (C) Occluding junctions (D) Gap junction (E) Focal contacts

4. What will happen when you trigger an action potential at each end of a very long axon? (A) Both action potentials will continue their transmissions to their respective distal ends. (B) The action potential starts close to the soma will transmit to the other end. (C) The action potential starts far away from the soma will transmit to the other end. (D) Two action potentials will merge into one action potential that subsequently transmits to the axon terminal in a larger amplitude. (E) Two action potentials will cancel each other around the middle of this axon.

5. Diapedesis occurs at: (A) vasa vasorum (B) arteries (C) capillaries (D) postcapillary venules (E) inferior vena cava

7.________helps the maintenance of membrane fluidly of animal cells in cold environments. (A) PIP2 (B) Glycerol (C) Cholesterol (D) Phospholipid (E) Fibronectin

8. Which of the following is not the derivatives of mesoderm in vertebrates? (A) Skeletal systems (B) Circulation and lymphatic systems (C) Dermis of skin (D) Adrenal cortex (E) Thymus

9. The destination of ubiquitinated proteins in cytosol is__________. (A)lysosome (B)autophagosome (C) proteosome (D) spliceosome (E) peroxisome

10. Which of the following genotypes due to nondisjunction of sex chromosomes is lethal? (A)XXX (B)OY (C) XXY (D) XO (E) None of the above

11.What do hagfishes and lampreys have in common with the extinct conodonts? (A) Lungs (B) The jawless condition (C) Bony vertebrae (D) Their mode of feeding (E) Swim bladders

12. A polymerase chain reaction must have:I. DNA template II. DNA primersIII. RNA polymeraseIV. dNTPs V. DNA polymerase VI. RNA primers (A) I, II, III, IV (B) I, II, IV, V (C) I, III, IV, VI (D) I, II, V (E) I, IV, V, VI