Question 1

What is required for the separation of homologous chromosomes at anaphase I?

Accepted Answer

A)  the separation of sister centromeres
B)  the dissolution of the chiasmata
C)  the dissolution of the centromeres
D)  the dissolution of the centrosomes
E)  the separation of nucleosomes B

Question 2

Due to the reciprocal exchange of DNA strands that occurs during genetic recombination,the two duplexes are covalently linked to one another to form a joint molecule called a(n)__________ that contains a pair of DNA crossovers called __________.

Accepted Answer

A)  homoduplex,Holliday junctions
B)  heteroduplex,Holliday junctions
C)  Holliday junction,heteroduplexes
D)  Holliday junction,homoduplexes
E)  heteroduplexes,junctional complexes B

Question 3

What allows the interaction between the mitotic spindle and the chromosomes to occur?

Accepted Answer

A)  nuclear envelope breakdown
B)  nucleosome breakdown
C)  nucleolus breakdown
D)  chromatin dissolution
E)  chromosome condensation A

Question 4

The total length of the cell cycle of cells in a cell culture is 24 hours.M phase is found to be 1 hour,S phase is found to be 9 hours and G2 is found to be 4.5 hours.How long is G1?

Accepted Answer

A)  24 hours
B)  9) 5 hours
C)  9 hours
D)  1 hour
E)  4) 5 hours

Question 5

The process of centriole "replication" begins in the cytoplasm with the appearance of a small ________.

Accepted Answer

A)  pericentriole
B)  procentriole
C)  precentriole
D)  procentrosome
E)  pericentrosome

Question 6

By what process are gametes produced from a gametophyte?

Accepted Answer

A)  meiosis
B)  cytokinesis
C)  mitosis
D)  fission
E)  replication

Question 7

Anaphase I is the cytological event that corresponds to which scientific law?

Accepted Answer

A)  the first law of thermodynamics
B)  the second law of thermodynamics
C)  Mendel's law of segregation
D)  Mendel's law of independent assortment
E)  the Lambert - Beer law

Question 8

What is the first step in genetic recombination?

Accepted Answer

A)  lengthening of the chromosomes
B)  the introduction of single-stranded breaks in aligned DNA molecules
C)  the introduction of double-stranded breaks in aligned DNA molecules
D)  the accurate alignment of DNA molecules
E)  the exchange of pieces of DNA between homologous chromosomes

Question 9

Once a fission yeast cell passes START,the cell is committed to replication.What is responsible for activating cdc2 at this time?

Accepted Answer

A)  one or more G1 cyclins
B)  one or more G2 cyclins
C)  one or more S cyclins
D)  one or more M cyclins
E)  one or more G0 cyclins

Question 10

What stimulus can induce liver cells to proliferate?

Accepted Answer

A)  interaction with an appropriate antigen
B)  interaction with an appropriate antibody
C)  surgical removal of part of the liver
D)  a buildup of bile in the liver
E)  glycogen buildup in the liver

Question 11

Kinetochores of sister chromatids are connected as a unit to microtubules from __________.

Accepted Answer

A)  the same spindle pole
B)  opposite spindle poles
C)  the centromere of its neighboring chromosome
D)  the centromere of its homologue
E)  random centromeres of other chromosomes

Question 12

Which stage of mitosis starts as sister chromatids split apart and begin to move toward opposite poles?

Accepted Answer

A)  prophase
B)  metaphase
C)  prometaphase
D)  anaphase
E)  telophase

Question 13

What stage of prophase I is usually recognized by the dissolution of the synaptonemal complex and the tendency of homologous chromosomes of the bivalents to pull away somewhat from each other?

Accepted Answer

A)  pachytene
B)  leptotene
C)  diakinesis
D)  zygotene
E)  diplotene

Question 14

What external stimulation is required by mammalian cells to progress through the cell cycle prior to reaching the restriction point?

Accepted Answer

A)  presence of steroid hormones in their culture medium
B)  presence of Na+ ions in their culture medium
C)  presence of growth factors in their culture medium
D)  no external stimulation is required
E)  presence of vitamins in their culture medium

Question 15

The integrity of the nuclear envelope is disrupted _________.

Accepted Answer

A)  as the interactions between nucleoporin complexes are disrupted and the proteins dissociate into the surrounding medium
B)  by depolymerization of the lamin filaments
C)  as its integrity is disrupted mechanically as holes are torn into it by cytoplasmic dyneins associated with the outer nuclear membrane
D)  by cytoplasmic kinesins
E)  by cytoplasmic microtubules and microfilaments

Question 16

Which of the cells below normally possess a relatively high level of mitotic activity?

Accepted Answer

A)  stem cells of various adult tissues
B)  hematopoietic stem cells that give rise to red and while blood cells
C)  stem cells at the base of numerous epithelia that line the body cavities
D)  the relatively unspecialized cells found near the tips of plant roots and stems
E)  All of these are correct.

Question 17

Synapsis is accompanied by the formation of a complex,ladderlike structure made of three parallel bars with transverse protein filaments connecting its central element with two lateral elements.What is the name of this structure?

Accepted Answer

A)  synaptonemal ladder
B)  ladderellen
C)  synaptonemal complex
D)  nuclear complex
E)  nucleolar complex

Question 18

Microtubules are nucleated in cells with centrosomes in the vicinity of the centrosomes.Where do they nucleate in cells lacking centrosomes?

Accepted Answer

A)  in the vicinity of the nucleolus
B)  in the vicinity of the mitochondria
C)  in the vicinity of the chromosomes
D)  in the vicinity of the cell membrane
E)  in the vicinity of the lysosomes

Question 19

Even before cytokinesis has been completed,the two centrioles of a daughter cell disengage,an event that is triggered by the enzyme _________,which becomes activated late in mitosis.

Accepted Answer

A)  invertase
B)  centriolase
C)  separase
D)  disengagase
E)  activase

Question 20

The regulatory subunit of maturation-promoting factor ________.

Accepted Answer

A)  transfers a phosphate group to certain serine and threonine residues of specific protein substrates
B)  is called cyclin because its concentration rises and falls predictably as the cell cycle progresses
C)  converts ATP to ADP
D)  converts ADP to ATP
E)  transfers a phosphate group to certain tyrosine residues of specific protein substrates

Exam 14: Cellular Reproduction

What is required for the separation of homologous chromosomes at anaphase I?

Due to the reciprocal exchange of DNA strands that occurs during genetic recombination,the two duplexes are covalently linked to one another to form a joint molecule called a(n) that contains a pair of DNA crossovers called .

What allows the interaction between the mitotic spindle and the chromosomes to occur?

The total length of the cell cycle of cells in a cell culture is 24 hours.M phase is found to be 1 hour,S phase is found to be 9 hours and G₂ is found to be 4.5 hours.How long is G₁?

The process of centriole "replication" begins in the cytoplasm with the appearance of a small ________.

By what process are gametes produced from a gametophyte?

Anaphase I is the cytological event that corresponds to which scientific law?

What is the first step in genetic recombination?

Once a fission yeast cell passes START,the cell is committed to replication.What is responsible for activating cdc2 at this time?

What stimulus can induce liver cells to proliferate?

Kinetochores of sister chromatids are connected as a unit to microtubules from __________.

Which stage of mitosis starts as sister chromatids split apart and begin to move toward opposite poles?

What stage of prophase I is usually recognized by the dissolution of the synaptonemal complex and the tendency of homologous chromosomes of the bivalents to pull away somewhat from each other?

What external stimulation is required by mammalian cells to progress through the cell cycle prior to reaching the restriction point?

The integrity of the nuclear envelope is disrupted _________.

Which of the cells below normally possess a relatively high level of mitotic activity?

Synapsis is accompanied by the formation of a complex,ladderlike structure made of three parallel bars with transverse protein filaments connecting its central element with two lateral elements.What is the name of this structure?

Microtubules are nucleated in cells with centrosomes in the vicinity of the centrosomes.Where do they nucleate in cells lacking centrosomes?

Even before cytokinesis has been completed,the two centrioles of a daughter cell disengage,an event that is triggered by the enzyme _________,which becomes activated late in mitosis.

The regulatory subunit of maturation-promoting factor ________.

Exam 14: Cellular Reproduction

What is required for the separation of homologous chromosomes at anaphase I?

Due to the reciprocal exchange of DNA strands that occurs during genetic recombination,the two duplexes are covalently linked to one another to form a joint molecule called a(n) __________ that contains a pair of DNA crossovers called __________.

What allows the interaction between the mitotic spindle and the chromosomes to occur?

The total length of the cell cycle of cells in a cell culture is 24 hours.M phase is found to be 1 hour,S phase is found to be 9 hours and G2 is found to be 4.5 hours.How long is G1?

The process of centriole "replication" begins in the cytoplasm with the appearance of a small ________.

By what process are gametes produced from a gametophyte?

Anaphase I is the cytological event that corresponds to which scientific law?

What is the first step in genetic recombination?

Once a fission yeast cell passes START,the cell is committed to replication.What is responsible for activating cdc2 at this time?

What stimulus can induce liver cells to proliferate?

Kinetochores of sister chromatids are connected as a unit to microtubules from __________.

Which stage of mitosis starts as sister chromatids split apart and begin to move toward opposite poles?

What stage of prophase I is usually recognized by the dissolution of the synaptonemal complex and the tendency of homologous chromosomes of the bivalents to pull away somewhat from each other?

What external stimulation is required by mammalian cells to progress through the cell cycle prior to reaching the restriction point?

The integrity of the nuclear envelope is disrupted _________.

Which of the cells below normally possess a relatively high level of mitotic activity?

Synapsis is accompanied by the formation of a complex,ladderlike structure made of three parallel bars with transverse protein filaments connecting its central element with two lateral elements.What is the name of this structure?

Microtubules are nucleated in cells with centrosomes in the vicinity of the centrosomes.Where do they nucleate in cells lacking centrosomes?

Even before cytokinesis has been completed,the two centrioles of a daughter cell disengage,an event that is triggered by the enzyme _________,which becomes activated late in mitosis.

The regulatory subunit of maturation-promoting factor ________.

Due to the reciprocal exchange of DNA strands that occurs during genetic recombination,the two duplexes are covalently linked to one another to form a joint molecule called a(n) that contains a pair of DNA crossovers called .

The total length of the cell cycle of cells in a cell culture is 24 hours.M phase is found to be 1 hour,S phase is found to be 9 hours and G₂ is found to be 4.5 hours.How long is G₁?