Exam 10: Genes, Chromosomes and Dna

Two different strains of the bacteria Streptococcus pneumoniae were used in the experiments of Avery, MacLeod and McCarty: a virulent strain (S) that had a capsule and a non-virulent strain (R) that did not have a capsule. A heat-killed S strain was mixed with a live R strain and the mixture was injected into a mouse. Which statement below is CORRECT?

Synthesis of the lagging strand of DNA does NOT involve

If 20 per cent of bases of a DNA double helix are adenine, what percentage of the bases are thymine?

Telomeres

What is the role of telomeres in DNA replication in eukaryotes?

Which of the following statements about DNA replication is INCORRECT?

Bacteria were grown for a large number of generations in a medium containing the nitrogen isotope ¹⁵N. The bacteria were then allowed to go through two cell divisions in a medium containing the normal (and lighter) isotope ¹⁴N, after which the DNA of the bacteria was extracted and analysed. This extracted DNA (X) was compared to DNA (Y) extracted from bacteria that had always been grown in a medium containing ¹⁴N. You would expect that

Okazaki fragments are

The following is the sequence of bases on a strand of DNA: 5' ATGCAGC 3'. What is the sequence on the complementary strand?

In a nucleus the two strands of DNA are separated during replication by

DNA replication in eukaryotes and prokaryotes is very similar. Replicating DNA in both eukaryotes and prokaryotes would be expected to have

Which organism did Thomas Hunt Morgan study to provide strong evidence supporting the idea that chromosomes are directly involved in inheritance?

Eukaryotes have many more origins of replication than prokaryotes because

Which of the following statements about DNA synthesis in eukaryotes is INCORRECT?

Eukaryotic chromosomes are

In a normal diploid human cell, the nuclear genome consists of approximately

Which of the following statements about histones is INCORRECT?

Which of the following statement about centromeres is INCORRECT?

You are presenting a seminar to your peers on chromosomes, DNA and nuclear protein. As you are discussing the nucleosome core particle you are asked if this particle is associated with protein. How do you respond?

Which of the following enzymes is not required for eukaryotic DNA synthesis?