1. Immortal cell lineages
a. are derived from cancerous cells.
b. are derived from normal body cells.
c. are used in cell replacement therapy.
d. are unable to grow outside the body.
2. Which of the following applications seeks to reveal differences in the number of tandem repeats among individuals for the purposes of identification?
a. DNA Hybridization
b. DNA libraries
d. DNA Profiling
3. Chromosomes are unduplicated during which phase of cell cycle?
a. G1 phase
b. G2 phase
d. S phase
4. A cell cycle checkpoint for S phase would likely inhibit progression through the cell cycle if _____.
a. The surrounding cells are dividing.
b. The temperature of the cell is too low.
c. There is DNA damage.
d. ATP supply in the cell is too low.
1. Option A - are derived from cancerous cells
The origins of some immortal cell lines, for example HeLa human cells, are from naturally occurring cancers.
2.Option - D - DNA Profiling
The number of times a nucleotide sequence is repeated in each STR can be calculated from the size of the STRs. A forensic scientist can use this information to determine if a body fluid sample comes from a particular person.
3.Option A - G1 phase
G1 phase (Gap 1) - Cellular contents excluding the chromosomes, are duplicated.
4.Option C - There is DNA damage.
S Phase: To produce two similar daughter cells, the complete DNA instructions in the cell must be duplicated. DNA replication occurs during this S (synthesis) phase.
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