3. A cell secretes a signal molecule that affects neighboring cells. What is the type of signaling?
(A) Hormonal signaling.
(B)Paracrine signaling.
(C) Synaptic signaling.
(D) Autocrine signaling.
(E) Endocrine signaling.

79 According to the passage, when do sea turtles likely lay eggs? (A) At noon. (B) In the early afternoon. (C) At midnight. (D) At 10 in the morning.

80 According to the passage, how to keep the island green effectively? (A) Promote ecotourism. (B) Produce more debris to create the art wall. (C) Introduce more friends to visit this island. (D) Make food to feed sea turtles.

1. What is the correct sequence for the following structures in transmitting an electrical current of a typical motor neuron?1. cell body; 2. axon; 3. axon hillock; 4.dendrites; 5.synaptic terminals (A)4, 1, 3, 2, 5 (B) 5,4,1,3, 2 (C)4,3,1,2,5 (D)5,4,1,2,3 (E) 4,1, 2, 3, 5

2. Which is the correct description regarding fertilization in plants? (A) Fertilization involves multicellular organisms. (B) Fertilization is initiated once pollens are on the stigma. (C) Fertilization requires one fusion of cells. (D) Fertilization does not require specific recognition of mother cells. (E) Fertilization results in a change in ploidy.

4. What is the mechanism by which testosterone functions inside a cell? (A) It acts as a signal receptor that activates tyrosine kinases. (B) It binds with a receptor protein that enters the nucleus and activates the expression of specific genes. (C) It cooperates with a membrane receptor to response to drug treatment. (D) It acts as a steroid signal receptor that activates ion channel proteins in the plasma membrane. (E) It coordinates a phosphorylation cascade that reduces spermatogenesis.

5. Please identify which of the following structures is not haploid? (A)sporangium (B) archegonia (C) pollens (D) fungal hyphae (E) ovule

6. What is the correct order of plant evolution? (A) secondary cell wall → independent gametophytes → formation of protected embryo →double fertilization (B) secondary cell wall →multicellular gametophytes → double fertilization → formation of the protected embryo (C) independent gametophytes → secondary cell wall → formation of protected embryo →double fertilization (D)multicellulargameto phytes → secondary cell wall → double fertilization → formation of a protected embryo (E) multicellular gametophytes → formation of protected embryo→ secondary cell wall →double fertilization

7. Spermatogenesis and oogenesis are different in that (A) Spermatogenesis produces four sperm and oogenesis produces one egg. (B) Spermatogenesis produces four sperm and oogenesis produces two eggs. (C)Spermatogenesis produces four cells and oogenesis produces one haploid cell. (D) Oogenesis begins at the onset of puberty.(E) Spermatogenesis begins in the embryonic stage of development.

8. There is a mutated flower that only contains sepals and petals. According to ABC model for floral development, which type of identity genes is mutated? (A)onlyB(B) only C (C)Aand B(D)Band C (E) A and C

9. The major difference between a typical C4 plant and a C3 plant, is that (A) The C3 plant has a smaller opening of stomata, so that less CO2 can enter the plant. (B) The C4 plant only uses PEP carboxylase to catalyze all carbon fixation. (C) Rubisco in C4 plant has a high binding affinity to CO2 than that in the C3 (D) The carbon fixation rate in C4 plants is always higher than C3 under various growth temperatures. (E) The C4 plant only carries out the Calvin cycle only in the chloroplasts of bundle-sheath cells.