Biology, Eighth Edition (Raven)

Chapter 10: How Cells Divide

Post Test

The process of creating two chromosomes from an original template is termed (p. 186)
Eukaryote chromosomes have two _________ and one __________ while they, along with bacteria, contain many ___________. (p. 188)
A)Centrosomes … nucleus … cells
B)Telomeres … centromere … nucleotides
C)Sister chromatids … DNA strand … nucldi
D)Nucleotides … cell … sister chromatids
E)Centromeres … cell … telomeres
If the cell contains some arbitrary amount of material at the G2 phase of growth (say it's equal to 1 D, which stands for DNA density), how much is in the cell immediately after the S phase that follows? (p. 191)
A)1/3 D
B)1/2 D
C)1 D
D)2 D
E)4 D
Although all the DNA in a chromosome has been completely replicated after the S phase of the cell cycle, the centromere is a single unit that holds sister chromatids together until after cell division. Which protein holds the sister chromatids together at the centromere region? (p. 192)
A cell described as 2N (diploid) with a chromosome content of 14 (15 chromosomes) is undergoing cell division. The convention is to say "the cell is 2N=14". An easy way to determine the number of chromosomes is to just count the number of centromeres. Which is the best description of this cell at anaphase? (p. 195)
A)4N = 28
B)2N = 7
C)N = 7
D)2N = 14
E)It is impossible to tell
What happens if mitosis occurs without cytokinesis? (p. 196)
A)A multinucleate situation occurs
B)The cells die
C)The cells will lose some of their chromosomes
D)Cancer is a likely result due to the excessive numbers of genes in the cell
E)A new species can arise
What is the purpose of a "proto-oncogene"? (p. 201)
A)There's no particular purpose to genes given this name: it is assigned this label because if mutated, it loses control of cell division activities and can give rise to cancer
B)These are viral genes which can hijack cells into dividing without responding to normal cellular cues
C)These are critical genes that ordinarily provide for the well-being of the organism, but gain new functions, if mutated, that create tumors
D)They are very ancient genetic signals, and provide for cell nutrition.
E)Proto-oncogenes are classes of related proteins which all occur sequentially on a chromosome. This allows them to be activated one-after-the-other to make the proteins required for an organism to thrive
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