BIO 103 FINAL REVIEW EXAMS ACTUAL
QUESTIONS AND ANSWERS SURE A+
✔✔Cells require external signals called________in order to eventually be able
to________ - ✔✔growth factors, divide
✔✔Meiosis - ✔✔daughter cells have half the number of chromosomes as the starting
(parent) cell
✔✔Mitosis - ✔✔the daughter cells produced are identical copies of the starting (parent)
cell
✔✔Meiosis - ✔✔homologous chromosomes seperate from each other and are placed
into different daughter cells
✔✔both mitosis and meiosis - ✔✔a spindle fiber assembly consisting of microtubles and
motor proteins direct the movement of chromosomes
✔✔You see a single cell containing within it several nuclei. Which is a reasonable
explanation for how cell with more than one nucleus could form? - ✔✔failure of
cytokinesis to occur
✔✔You are observing a single cell under a microscope. You go home for the night, and
the next day you see four cells. The four cells look similar, and when you stain them
with a dye that binds to DNA they all appear to contain the same amount of DNA as the
, original cell. What likely happened overnight? - ✔✔The single cell divided to form two
new cells, and the two new cells each divided to form four total cells, all by mitosis.
✔✔Examine this image of a growing onion root tip. Match the numbered circles (shown
on the image) to the correct phase. - ✔✔1. telophase/cytokinesis, 2. anaphase, 3.
metaphase, 4. prophase, 5. interphase
✔✔G1 of Interphase - ✔✔DNA is inside a nucleus. 48 non-replicated ('normal size')
chromosomes are present.
✔✔Metaphase - ✔✔DNA is present in the highly-condensed chromatid state. 48
chromosomes are present.
✔✔G2 of Interphase - ✔✔DNA is present inside a nucleus. 48 replicated chromosomes
('jumbo chromosomes') are present.
✔✔Anaphase - ✔✔DNA is present in the highly-condensed chromatid state. 92
chromosomes are present.
✔✔Plants grow taller through mitosis at the tips of their shoots (above ground) and at
the tips of their roots (below ground). Here are two samples of tissue taken from a grass
plant, one from the tip of the root and one from the mid part of the plant.
Which sample is most likely from the middle of the plant and why? What can you
conclude from these data?
Stage Sample 1 Sample 2
Interphase 74% 98%
Prophase 18% 0.5%
Metaphase 4% 0.2%
Anaphase 2% 0.1%
Telophase 1% 0.1% - ✔✔Sample 2 is has fewer cells in M-phase, and so this sample
was taken from the middle of the plant.
✔✔Meiosis - ✔✔produces haploid cells from a diploid starting (parent) cell
✔✔Meiosis - ✔✔asexual reproduction
✔✔Mitosis - ✔✔replaces damaged cells
✔✔Mitosis - ✔✔required for growth of multicellular organisms
✔✔Meiosis - ✔✔production of eggs and sperm in animals
QUESTIONS AND ANSWERS SURE A+
✔✔Cells require external signals called________in order to eventually be able
to________ - ✔✔growth factors, divide
✔✔Meiosis - ✔✔daughter cells have half the number of chromosomes as the starting
(parent) cell
✔✔Mitosis - ✔✔the daughter cells produced are identical copies of the starting (parent)
cell
✔✔Meiosis - ✔✔homologous chromosomes seperate from each other and are placed
into different daughter cells
✔✔both mitosis and meiosis - ✔✔a spindle fiber assembly consisting of microtubles and
motor proteins direct the movement of chromosomes
✔✔You see a single cell containing within it several nuclei. Which is a reasonable
explanation for how cell with more than one nucleus could form? - ✔✔failure of
cytokinesis to occur
✔✔You are observing a single cell under a microscope. You go home for the night, and
the next day you see four cells. The four cells look similar, and when you stain them
with a dye that binds to DNA they all appear to contain the same amount of DNA as the
, original cell. What likely happened overnight? - ✔✔The single cell divided to form two
new cells, and the two new cells each divided to form four total cells, all by mitosis.
✔✔Examine this image of a growing onion root tip. Match the numbered circles (shown
on the image) to the correct phase. - ✔✔1. telophase/cytokinesis, 2. anaphase, 3.
metaphase, 4. prophase, 5. interphase
✔✔G1 of Interphase - ✔✔DNA is inside a nucleus. 48 non-replicated ('normal size')
chromosomes are present.
✔✔Metaphase - ✔✔DNA is present in the highly-condensed chromatid state. 48
chromosomes are present.
✔✔G2 of Interphase - ✔✔DNA is present inside a nucleus. 48 replicated chromosomes
('jumbo chromosomes') are present.
✔✔Anaphase - ✔✔DNA is present in the highly-condensed chromatid state. 92
chromosomes are present.
✔✔Plants grow taller through mitosis at the tips of their shoots (above ground) and at
the tips of their roots (below ground). Here are two samples of tissue taken from a grass
plant, one from the tip of the root and one from the mid part of the plant.
Which sample is most likely from the middle of the plant and why? What can you
conclude from these data?
Stage Sample 1 Sample 2
Interphase 74% 98%
Prophase 18% 0.5%
Metaphase 4% 0.2%
Anaphase 2% 0.1%
Telophase 1% 0.1% - ✔✔Sample 2 is has fewer cells in M-phase, and so this sample
was taken from the middle of the plant.
✔✔Meiosis - ✔✔produces haploid cells from a diploid starting (parent) cell
✔✔Meiosis - ✔✔asexual reproduction
✔✔Mitosis - ✔✔replaces damaged cells
✔✔Mitosis - ✔✔required for growth of multicellular organisms
✔✔Meiosis - ✔✔production of eggs and sperm in animals
