Which of the following is a major function of the nucleolus?
A: Produce ribosomal RN
B: Package DN
C: Perform DNA repair.
D: Protect the genetic material from damage.
A: Produce ribosomal RN
B: Package DN
C: Perform DNA repair.
D: Protect the genetic material from damage.
A
举一反三
- Stability genes (also called caretaker genes) encode proteins that function in the repair of major genetic defects that result from aberrant DNA replication, ionizing radiation, or environmental carcinogens.
- Our package for canned fruit is not only seaworthy but also strong enough to protect the goods _____ possible damage. A: from B: under C: to D: away
- In the 1940s Avery, MacLeod, and McCarty extended Griffith's transformation experiment. Which of the following was determined to be the genetic material that was transformed? A: DNA B: enzymes C: polysaccharides D: protein
- DNA在复制、转录、表达分别产生（） A: DN B: RN C: 多肽 D: DN E: DN F: 蛋白质 G: RN H: DN I: 多肽 J: RN K: RN L: 蛋白质
- 真核细胞和原核细胞的遗传物质分别是（）。 A: DN B: RNA C: DN D: DNA E: RN F: DNA G: RN H: RNA
内容
- 0
病毒含有的核酸通常是：() A: DNA和RN B: DNA或RN C: DN D: RNA
- 1
Our package for canned fruit is not only seaworthy but also strong enough to protect the goods ______ possible damage.
- 2
Which of the following is not tool of genetic engineering? A: Vectors B: Enzymes C: Foreign DNA D: GMO
- 3
Which of the following is not a function of a glycocalyx? A: It forms pseudopods for faster mobility of an organism. B: It can protect a bacterial cell from drying out. C: It protects a bacterial cell from killing by phagocytes. D: It allows a bacterium to stick to a host.
- 4
目前已知病毒5种核酸类型是（）。 A: DN B: +DN C: RN D: +RN E: －RNA F: DN G: +DN H: －DN I: RN J: ＋RNA K: DN L: +DN M: －DN N: RN O: －RNA P: DN Q: －DN R: RN S: +RN T: －RNA