28. Which enzyme is responsible for reverse transcription in retroviruses?
(A) RNA polymerase
(B) DNA polymerase
(C)Reverse transcriptase
(D) Ligase
(E)Protease

24. What part of the bacterial cell helps it move? (A) Capsule (B) The flagella (C)Pili (D) Fimbriae (E)Cilia

25. The maternal factor _______ define the anterior/head structure of a fly embryo. (A) Torso (B) Bicoid (C)Nanos (D) Antennapedia (E)Dorsal

26. Which two joined amino sugars form a peptidoglycan monomer? (A) N-acetylglucosamine and N-acetylmuramic acid (B) N-acetylglucosamine and N-acetyltalosaminuronic (C)N-acetylmuramic acid and pseudomurein (D) Galactosamine and Daunosamine (E)None of the above.

27. Bacterial conjugation is an example of _______ .(A) Transduction (B) Vertical gene transfer (C)Horizontal gene transfer (D) Bacterial transformation (E)None of the above.

29. Which of the following distinguishes cardiac muscle from both smooth and skeletal muscles? (A) Its cells contract. (B) Its cells are striped. (C)It generally cannot be contracted at will. (D) It generally can be contracted at will. (E)Its cells are branched.

30. Which of the following organs belongs to both the lymphatic and endocrine systems? (A) Pancreas (B) Kidney (C)Thymus (D) Spleen (E)Thyroid gland

31. Which one of the following statements is NOT true? (A) Not every organism is able to exchange gas, nutrients, and waste with its environment directly. (B) Some small molecules can move between cells and their surroundings by diffusion. (C)Both arthropods and human beings have closed circulatory systems. (D) A circulatory system includes a circulatory fluid, a set of interconnecting vessels, and a muscular pump. (E)All of the above.

32. Which of the following is an example of a tissue? (A) blood (B) the heart (C)a red blood cell (D) the respiratory system (E)the spleen

33. _______ produces the alkaline solution to neutralize the acidity of chyme. (A) Pancreas (B) Liver (C)Gallbladder (D) Small intestine (E)Stomach

34. The _______ carries nutrient-rich blood from the capillaries of the villi to the liver, then to the heart. (A) hepatic portal artery (B) hepatic portal vein (C)superior vena cava (D) hepatic vein (E)common carotid artery