Biology 300 Chapter 6 review questions

. The individual chromosomes become visible with a light microscope during which stage of mitosis? a. prophase b. prometaphase c. metaphase d. anaphase

a. prophase

Chromosomes are duplicated during what portion of the cell cycle? a. G1 phase b. S phase c. prophase d. prometaphase

b. S phase

An organism's traits are determined by the specific combination of inherited ________. a. cells b. genes c. proteins d. chromatids

b. genes

________ are changes to the nucleotides in a segment of DNA that codes for a protein. a. Proto-oncogenes b. Tumor suppressor genes c. Gene mutations d. Negative regulators

c. Gene mutations

What is necessary for a cell to pass the G2 checkpoint? a. cell has reached a sufficient size b. an adequate stockpile of nucleotides c. accurate and complete DNA replication d. proper attachment of mitotic spindle fibers to kinetochores

c. accurate and complete DNA replication

Separation of the sister chromatids is a characteristic of which stage of mitosis? a. prometaphase b. metaphase c. anaphase d. telophase

c. anaphase

Which eukaryotic cell-cycle event is missing in binary fission? a. cell growth b. DNA duplication c. mitosis d. cytokinesis

c. mitosis

A gene that codes for a positive cell cycle regulator is called a(n) ________. a. kinase inhibitor b. tumor suppressor gene c. proto-oncogene d. oncogene

c. proto-oncogene

A diploid cell has ________ the number of chromosomes as a haploid cell. a. one-fourth b. one-half c. twice d. four times

c. twice

FtsZ proteins direct the formation of a ________ that will eventually form the new cell walls of the daughter cells. a. contractile ring b. cell plate c. cytoskeleton d. septum

d. septum