31.
(A) A philosophical idea
(B) An important announcement
(C) A digital tool
(D) A past event

27. (A) He bought more textbooks. (B) He took more mock tests. (C) He took more classes. (D) He asked for help.

28. (A) A scientific discovery (B) An event announcement (C) A weather forecast (D) A historical story

29. (A) A sports competition (B) A happy celebration (C) An amusement park ride (D) A useful invention

30. (A) Giving a presentation (B) Filing a complaint (C) Giving an instruction (D) Chatting with his friend

32. (A) Students (B) Patients (C) Clients (D) Employees

33. (A) A doctor (B) A waiter (C) A chef (D) A cowboy

34. (A) Mandy Lee (B) Anna Peterson (C) Sarah Wang (D) Violet Cane

35.(A) $28000 (B) $35000 (C) $42000 (D) $50000

1. Which of the following statements about regulation of the lac operon is true? (A) Glucose in the growth medium does not affect the inducibility by lactose. (B) Glucose in the growth medium decreases the inducibility by lactose. (C) Glucose in the growth medium increases the inducibility by lactose. (D) Its expression is regulated mainly at the level of translation. (E) The lac operon is fully induced whenever lactose is present.

2. Which one of the following is not involved in steroid hormone action? (A) Transcription activation and repression (B) Hormone-receptor complexes (C) Specific DNA sequences (D) Cell surface receptors (E) Zinc fingers