A) The DNA has not been replicated yet.
B) The spindle must move them to the metaphase plate before they become visible.
C) They leave the nucleus and are dispersed to other parts of the cell.
D) Sister chromatids do not pair up until division starts.
E) They have uncoiled to form long, thin strands.
A) G2: cell division
B) G1: follows cell division
C) M: duplication of DNA
D) S: immediately precedes cell division
E) All of the above are correctly matched.
A) a decrease in chromosome number
B) inability to duplicate DNA
C) large cells containing many nuclei
D) a rapid rate of gamete production
E) division of the organism into many cells, most lacking nuclei
A) They have an unusual number of chromosomes.
B) They migrate from the initial site of transformation to other organs or tissues.
C) They remain confined to their original site
D) They can divide indefinitely if an adequate supply of nutrients is available.
E) They are the result of the transformation of normal cells.
A) They activate or inactivate other proteins.
B) They respond to the same cyclins.
C) They utilize the same Cdks.
D) They each have only one cyclin/Cdk complex.
E) They give the go-ahead signal to progress to the next checkpoint.
A) It does not alter metabolically active cells.
B) It interferes with rapidly dividing cells.
C) It interferes with cells entering G0.
D) It only attacks cells that are density dependent.
E) It is safe enough to limit all apoptosis.
A) are unable to synthesize DNA.
B) cannot function properly because they are affected by density-dependent inhibition.
C) continue to divide even when they are tightly packed together.
D) are arrested at the S phase of the cell cycle.
E) are always in the M phase of the cell cycle.
A) They need only meiosis if they produce egg cells.
B) They need only mitosis to make large numbers of cells such as sperm.
C) A single-celled organism only needs mitosis.
D) They need both if they are producing animal gametes.
E) They need meiosis if the cells are producing organs such as ovaries.
A) the separation of divided prokaryotes
B) a groove in the plasma membrane between daughter nuclei
C) the space that is created between two chromatids during anaphase
D) a ring of vesicles forming a cell plate
E) the metaphase plate where chromosomes attach to the spindle
A) a bacterial cell dividing.
B) a plant cell in the process of cytokinesis.
C) an animal cell in the S phase of the cell cycle.
D) a plant cell in metaphase.
E) an animal cell in the process of cytokinesis.
A) spindle formation
B) replication of the DNA
C) condensation of the chromosomes
D) separation of the spindle poles
E) separation of sister chromatids