BSC Chapter 8

Animal cells have “counters” that keep track of how many times a cell has divided. These counters are called:

• centromeres

• odometers

• telomeres

• nuclei

• chromosomes.

Which aspect of cell division ultimately leads to cell death?

• Genes in the telomere region fail to divide.

• Telomeres impair the functioning of a protein that maintains the nucleus.

• Telomeres become too short.

• D) Cells die after 20−30 divisions.

• E) Cells remain in the “resting phase” for too long.

What would you expect to happen in an individual with shorter-than-normal telomeres?

• The telomeres would be continually rebuilt after each round of cell division.

• Cells would undergo more rapid cell division than usual.

• Cells and tissues would begin to appear aged soon after birth.

• Cells and tissues would appear to age more slowly.

• Cells would become cancerous.

Most prokaryotes carry their genetic information in:

• a single, linear chromosome.

• multiple, circular chromosomes.

• a single, circular chromosome.

• multiple, linear chromosomes.

• ) two circular chromosomes.

Which statement describes the function of the histones in eukaryotic cells?

• They help the double-stranded DNA molecule unwind from its coiled-up configuration.

• They help direct the dividing of the cytoplasm into two daughter cells.

• They function as catalysts in the replication phase of cell division.

• They enable DNA to be tightly and efficiently packed inside the nucleus.

• They serve as the attachment site for the chromosomes before replication.

In asexual reproduction, daughter cells inherit their DNA from:

• a single parent.

• two separate parents.

• a single offspring.

• multiple offspring.

• alternating generations.

Which statement about prokaryotes is true?

• They have a linear chromosome within the nucleus

• Daughter cells contain half the genetic material as the parent cell.

• They have a single, circular chromosome, housed within the nucleus

• They reproduce using binary fission.

• Daughter cells inherit their genetic material from two parent cells

The division of the cytoplasm during cell division is referred to as:

• cytokinesis

• binary fission

• Gap 1.

• replication

• Gap 2.

The majority of a eukaryotic cell’s life is spent in an “in-between-division” stage referred to as:

• prophase

• interphase

• DNA synthesis phase.

• dormant phase.

• mitotic phase.

Within interphase, which stage is defined by the active replication of the cell’s genetic material?

• Gap 1

• replication

• DNA synthesis

• Gap 2

• mitotic phase