19. Which viruses have single-stranded RNA that acts as a template for DNA synthesis?
(A) proviruses
(B) viroids
(C) bacteriophages
(D) retroviruses

15. The beginning of anaphase is indicated by which of the following? (A) Chromatids lose their kinetochores. (B) Cohesin attaches the sister chromatids to each other. (C) Cohesin is cleaved enzymatically. (D) Spindle microtubules begin to polymerize.

16. Which of the following is a true statement about sexual vs. asexual reproduction? (A) Asexual reproduction, but not sexual reproduction, is characteristic of plants and fungi. (B) In sexual reproduction, individuals transmit half of their nuclear genes to each of their offspring. (C) In asexual reproduction, offspring are produced by fertilization without meiosis. (D) Asexual reproduction produces only haploid offspring.

17. Which of the following is true of a species that has a chromosome number of 2n = 16? (A) The species is diploid with 32 chromosomes per cell. (B) The species has 16 sets of chromosomes per cell. (C) Each diploid cell has eight homologous pairs. (D) A gamete from this species has four chromosomes.

18. Codons are part of the molecular structure of _____. (A) a protein (B) mRNA (C) tRNA (D) rRNA

20. The reason for using Taq polymerase for PCR is that _____.(A) it is heat stable and can withstand the heating step of PCR (B) only minute amounts are needed for each cycle of PCR (C) it binds more readily than other polymerases to the primers (D) it has regions that are complementary to the primers

21. In an open circulatory system, blood is _____.(A) always inside of vessels and is under higher pressure than in closed circulatory systems (B) not always confined to blood vessels and is under higher pressure than in closed circulatory systems (C) always inside of vessels and is under lower pressure than in closed circulatory systems (D) not always confined to blood vessels and is under lower pressure than in closed circulatory systems

1. Figure 1可為以下哪個轉移函數之步階響應 (A)(B) (C) (D)(E) 以上皆非

2. Figure 2可為以下哪個轉移函數之步階響應 (A)(B)(C) (D)(E) 以上皆非

3.Figure 3可為以下哪個轉移函數之步階響應 (A)(B)(C) (D)(E) 以上皆非

4.Figure 4可為以下哪個轉移函數之步階響應 (A)(B) (C)(D)(E) 以上皆非