1. 基因體印記(genomic imprinting)是指只有來自特定親代的基因得以表現的現象，通常是因為 DNA 的胞嘧啶(cytosine, C)發生甲基化(methylation)，使得特定基
2. What causes a differentiating B cell to become committed to producing only one species of antibod
3. Which of the following about neuron is incorrect?(A) It is a polarized cell.(B) Peripheral nervou
4. In the life cycle of an angiosperm, which of the following cells or tissues are diploids?(A) gene
5. The black dots that cover strawberries are actually individual fruits from a flower with multiple
6. During splicing, which major molecular component of the spliceosome catalyzes the excision reacti
7. Which of the following statements regarding the body plans of animal is correct?(A) Cnidarian are
8. In a phylogenetic tree, a group is composed of some species but not their most recent common ance
9. Bioluminescence is an important strategy for attracting preys in which of the following marine zo
10. Which of the following descriptions regarding sensory receptors is correct?(A) Sense of smell is
11. Which statement is incorrect concerning protein translation?(A) Ribosomes in prokaryotic and euk
12. Testosterone is synthesized primarily by the ________.(A) Leydig cells (B) hypothalamus (C) sper
13. Which of the following orders regarding mammalian embryogenesis is correct?1. cleavage2. gastrul
14. Which of the following descriptions regarding the embryonic germ layers is correct?(A) Pituitary
15. Which of the following about chloroplasts and mitochondria is incorrect?(A) They are of the appr
16. ________ are commonly referred to, respectively, as the 21st and 22nd amino acids.(A) Selenocyst
17. Which of the following sequences is not found in an E. coli vector (such as pET21)?(A) replicati
18. Which of the following metabolic pathways is strictly anabolic?(A) glycolysis (B) gluconeogenesi
19. Dihydrouracil and pseudouridine are found predominantly in ________.(A) mRNA (B) rRNA (C) tRNA (
20. Which oil listed below contains more than 60% unsaturated fatty acids?(A) beef (B) milk (C) coco
21. In order to perform PCR, the following reagents must be included ________.(A) DNA fragment, prim
22. The coding sequence of DNA is 5’-CGCTATAGCGTTT-3’. Which of the following sequences is its RNA t