1)After Meiosis II, a typical animal cell is: diploid, with two copies of each h

Question

1)After Meiosis II, a typical animal cell is:

diploid, with two copies of each homolog (2N,2X)

haploid, with one copy of each homolog (1N,1X)

diploid with one copy of each homolog (2N,1X)

haploid, with two copies of each homolog (1N,2X)

2) Normal human somatic cells (not gametes) are:

diploid, with two copies of each homolog (2N,2X)

haploid, with one copy of each homolog (1N,1X)

diploid with one copy of each homolog (2N,1X)

haploid, with two copies of each homolog (1N,2X)

3) What technique was used to visualize the DNA shown below?

SDS-PAGE

Another type of electrophoresis

Density gradient centrifugation

Microscopy

4) Given your knowledge of how DNA is replicated, which of the following DNA will be present after 100 generations in the Meselson-Stahl Experiment?

50% N14:N14 hybrids and 50% N14:N15 hybrids

All of the DNA will be N15:N14

Almost all of the DNA will be N14:N14, but a very small amount of N14:N15 will remain

25% N15:N15; 50% N14:N15; 25% N14:N14

All of the DNA will be N15:N15

5) Which of the following is used during animal cell mitosis that is not used for cytokinesis?

Dynein

Kinesin

Myosin

Dynein and kinesin

50% N14:N14 hybrids and 50% N14:N15 hybrids

All of the DNA will be N15:N14

Almost all of the DNA will be N14:N14, but a very small amount of N14:N15 will remain

25% N15:N15; 50% N14:N15; 25% N14:N14

All of the DNA will be N15:N15

5) Which of the following is used during animal cell mitosis that is not used for cytokinesis?

Dynein

Kinesin

Myosin

Dynein and kinesin

Explanation / Answer

1. diploid with one copy of each homolog (2N,1X?). The meiosis II is similar to mitosis only. All the meiotic events take place in meiosis I only. The chromsome will double before meisois and each cell will have one copy of homologs chrmosomes after two divisions. i.e. meiosis I and meiosis II.

2. diploid, with two copies of each homolog (2N,2X)

3. SDS PAGE is used for proteins and Density gradient centrifugation is not used for DNA visualisation. Hence it is another type of gel electrophoresis like agarose gel electrophoresis.

4. Almost all of the DNA will be N14:N14, but a very small amount of N14:N15 will remain?. In 100 generations the newly synthesized strands will have only N14 N14 only. The few initially present will be the hybrids.

5. Dyenin, It play important role in chromosome movements, centromere separation and cell division during cleavage furrow formation.

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