BIO 148 -part 1 Exam 2 Questions With
100% Correct Answers Verified A+
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What does "semi-conservative replication" mean? - Answer- Each new DNA molecule
contains one old +one new strand.
In what direction is DNA synthesized? - Answer- 5' to 3'
What enzyme unwinds DNA? - Answer- Helicase
What enzyme bulids new DNA - Answer- DNA polymerase
What is a chromosome? - Answer- One DNA molecule
What is an unreplicated chromosome? - Answer- One DNA molecule, one chromatid
What is a replicated chromosome? - Answer- One chromosome made of two sister
chromatids
What are sister chromatids? - Answer- Identical DNA copies attached at the centromere
What happens in G1? - Answer- Cell grows; organelles/proteins duplicated
What happens in S phase? - Answer- DNA replication -> chromosomes become
replicated
What happens in G2? - Answer- DNA checked for errors; mitosis prep
If a cell has 16 chromosomes in G1, how many DNA molecules are there? - Answer- 16
because replication hasn't happened yet
If a cell has 16 chromosomes after S phase, how many DNA molecules are there? -
Answer- 32 DNA molecules, 16 chromosomes, 16 sister chromatid pairs.
What happens to chromosome number in anaphase - Answer- Sister chromatids
separate -> chromosome number doubles
What happens in prophase? - Answer- Chromosomes condense; nuclear membrane
disappears
What happens in metaphase? - Answer- Chromosomes line up; spindle attaches
100% Correct Answers Verified A+
Pass
What does "semi-conservative replication" mean? - Answer- Each new DNA molecule
contains one old +one new strand.
In what direction is DNA synthesized? - Answer- 5' to 3'
What enzyme unwinds DNA? - Answer- Helicase
What enzyme bulids new DNA - Answer- DNA polymerase
What is a chromosome? - Answer- One DNA molecule
What is an unreplicated chromosome? - Answer- One DNA molecule, one chromatid
What is a replicated chromosome? - Answer- One chromosome made of two sister
chromatids
What are sister chromatids? - Answer- Identical DNA copies attached at the centromere
What happens in G1? - Answer- Cell grows; organelles/proteins duplicated
What happens in S phase? - Answer- DNA replication -> chromosomes become
replicated
What happens in G2? - Answer- DNA checked for errors; mitosis prep
If a cell has 16 chromosomes in G1, how many DNA molecules are there? - Answer- 16
because replication hasn't happened yet
If a cell has 16 chromosomes after S phase, how many DNA molecules are there? -
Answer- 32 DNA molecules, 16 chromosomes, 16 sister chromatid pairs.
What happens to chromosome number in anaphase - Answer- Sister chromatids
separate -> chromosome number doubles
What happens in prophase? - Answer- Chromosomes condense; nuclear membrane
disappears
What happens in metaphase? - Answer- Chromosomes line up; spindle attaches
