分子生物学(东北林业大学)中国大学mooc慕课答案2024版100分完整版

对应课程:点击查看
起止时间:2021-03-15到2021-07-26
更新状态:每5天更新一次

第二章 基因概念的演化与发展 第二章单元测试

1、 A DNA nucleotide may consist of

A:a
ribose sugar, a phosphate group, and adenine.
B: a phosphate group, deoxyribose, and cytosine.
C:uracil,
deoxyribose, and a phosphate group.
D:deoxyribose,
thymine, and a hydroxyl group.
答案: a phosphate group, deoxyribose, and cytosine.

2、 Which is the most accurate representation of the organization levels of the genetic information in cells?

A:genes ž nucleotidežchromosomes žgenome.
B:genomež genesžnucleotidesžchromosomes.
C:chromosomesžgenes ž nucleotides žgenome.
D:nucleotidesžgenesžchromosomesžgenome.
答案: nucleotidesžgenesžchromosomesžgenome.

3、 Eukaryotic cells differ from prokaryotic cells in that only the former contain

A: ribosomes.
B:cytoplasm.
C:DNA.
D:a nucleus.
答案: a nucleus.

4、 The prokaryotic organism that has been the subject of many genetic studies is

A:Saccharomyces cerevisiae.
B:Neurospora crassa.
C:E. coli.
D:Drosophila melanogaster.
答案: E. coli.

5、 Which element is not found in a molecule of DNA?

A:carbon.
B:sulfur.
C:nitrogen.
D:oxygen.
答案: sulfur.

6、 Which is found in RNA, but not DNA?

A:Phosphate.
B:Adenine.
C: Ribose.
D:Cytosine.
答案: Ribose.

7、 The two polynucleotide chains in a molecule of DNA
are held together by what type of bond?

A:Phosphodiester.
B:Phosphate.
C: Peptide.
D:hydrogen.
答案: hydrogen.

8、 The DNA that makes up bacterial chromosomes is

A:single-stranded.
B:circular
and supercoiled.
C:complexed
with histones.
D: all
the above.
答案: circular
and supercoiled.

9、 Which of the following is a DNA base pair?

A:A-T.
B:T-C.
C:A-U.
D:G-T.
答案: A-T.

10、 Which of the following is a RNA base pair?

A:A-T.
B: A-C
C:U-C
D:U-A
答案: U-A

11、 The DNA and histone proteins in a eukaryotic chromosome are compacted into structures called

A: proteosomes.
B:nucleosomes.
C:telomeres.
D:centromeres.
答案: nucleosomes.

12、 In his transformation experiments, Frederick
Griffith observed that virulent strains of Streptococcus pneumoniaeproduced ___ colonies.

A:smooth,
shiny
B:rough,
dry
C:exceptionally
large
D:unusually
colored
答案: smooth,
shiny

13、 Viral genomes may be composed of

A:RNA
only.
B: DNA
only.
C:either
RNA or DNA.
D:both
RNA and DNA.
答案: either
RNA or DNA.

14、 In the Hershey-Chase blender experiments, their
major conclusion was that

A:a
single gene directed the synthesis of a single polypeptide.
B:DNA
was the genetic material.
C:DNA
was a double helix.
D:the
genetic material was located in the nucleus of cells.
答案: DNA
was the genetic material.

15、 The type of DNA found most commonly in living cells
is the ___ form.

A:A.
B:B.
C:C.
D:Z.
答案: B.

16、 Genes located in which region of a eukaryotic
chromosome are most likely to be transcribed?

A:centromere
B:telomere
C:euchromatin
D:heterochromatin
答案: euchromatin

17、 A nucleoside consists of a

A:pentose
sugar and a nitrogenous base.
B:phosphate
group and a nitrogenous base.
C:pentose
sugar and a phosphate group.
D:pentose
sugar, a phosphate group, and a nitrogenous base
答案: pentose
sugar and a nitrogenous base.

18、 Prokaryotic chromosomes consist mostly of

A: unique
sequence DNA only.
B:repetitive
sequence DNA only.
C:either
unique sequence or repetitive sequence DNA.
D:both
unique sequence and repetitive sequence
答案: unique
sequence DNA only.

19、 To create a karyotype, ___ chromosomes are spread on

卞愤疏邵受箔古庞泥耐屁淡临