1 A cell biologist examines a leaf cell from an alfalfa plant during metaphase o
ID: 59057 • Letter: 1
Question
1
A cell biologist examines a leaf cell from an alfalfa plant during metaphase of mitosis and determines that 32chromatids are present. The role of fertilization in this species is to (List the letters of all choices that apply.)
a. Produce a new cell that has a combination of chromosomes from 2 different parents
b. Increase the number of chromosomes per cell from 16 to 32
c. Increase the number of chromosomes per cell from 8 to 16
d. Combine the chromosomes from 2 haploid cells into a single diploid cell
2
When differentiation occurs, cells may also change in (list all letters that apply)
a. genetic content.
b. size.
c. shape.
3
Sister chromatids move to opposite poles of the cell during (List all letters that apply.)
a. Anaphase I of meiosis
b. Metaphase I of meiosis
c. Anaphase II of meiosis
d. Anaphase of mitosis
4
Which cells never divide by meiosis? (List all letters that apply.)
a. haploid cells c. somatic cells e. zygotes
b. diploid cells d. germ-line cells
5
What are the characteristics of stem cells? (List the letters of all choices that apply)
a. Totipotent stem cells are part of a committed pathway within one cell lineage that will give rise to one specific cell type.
b. Pluripotent stem cells are descendants of the totipotent stem cells of the embryo.
c. A fertilized egg is a type of totipotent stem cell.
d. Pluripotent stem cells can differentiate into any cell type, except for totipotent stem cells and the cells of the placenta.
6
Check all of the possible results of a mutation in an integrin protein.
a. an alteration of cellular growth
b. a defection of attachment of the cell to the extracellular matrix
c. the failure to induce changes in gene transcription
Explanation / Answer
Answer for 1;
a.producing the New cell that has combination of chromosomes from 2 different parents .
b. Increase the number of chromosomes per cell from 8 to16
c. combine the chromosome from 2 hapliod cell into single dipliod cell .
2. When differentiation occurs ,cells may also change ;
a. genetic content .
3.sister chromatids move towards the opposite pole is
answer; Anaphase of mitosis ,Anaphase II of meiosis .
4. which cells do not divide during meiosis ?
answer; hapliod cells .
5. pleuripotent stem cells are descendent of the totipotent cell of the embryo.
6. a defection of attachment of cell to the extracellular matrix
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