
Anaphase Promoting Complex (APC) is a protein degradation machinery necessary for proper mitosis of animal cells. If APC is defective in human cells, which of the following is expected to occur?
a. Recombination of chromosome arms will occur.
b. Chromosomes will not condense.
c. Chromosomes will be fragmented.
d. Chromosomes will not segregate.
Answer
506.4k+ views
Hint: Anaphase Promoting Complex (APC) is a multisubunit ubiquitin-protein ligase that targets for degradation cell-cycle.
Complete Answer:
Anaphase-promoting complex (APC) is a multi-subunit ubiquitin ligase. It plays a major role in the progression of the eukaryotic cell cycle.
Option a: Recombination of chromosome arms occurs during the prolonged prophase of Meiosis I. Prophase I is the longest and most important segment of meiosis.
Option b: Condensation of chromosomes occurs in the prophase of mitosis. The chromatin in a cell compacts to form condensed chromosomes. Condensation of the chromosome is required so that cells divide properly.
Option c: Fragmentation of chromosome is a phenomenon that takes place during mitosis. It occurs when chromosomes are damaged either by drug treatment or when a damaged cell passes through the G2 checkpoint.
Option d: Anaphase promoting complex (APC) helps in the transition of the chromosome from metaphase to anaphase. The role of APC is that it attaches to the chromosomes aligned at the equator during metaphase and allows the segregation of the chromatids.
Thus, the correct option is d) Chromosomes will not segregate.
Note: It is to be noted that Anaphase-Promoting promotes the onset of anaphase by marking Cyclin B1 and securin for proteasomal destruction.
Complete Answer:
Anaphase-promoting complex (APC) is a multi-subunit ubiquitin ligase. It plays a major role in the progression of the eukaryotic cell cycle.
Option a: Recombination of chromosome arms occurs during the prolonged prophase of Meiosis I. Prophase I is the longest and most important segment of meiosis.
Option b: Condensation of chromosomes occurs in the prophase of mitosis. The chromatin in a cell compacts to form condensed chromosomes. Condensation of the chromosome is required so that cells divide properly.
Option c: Fragmentation of chromosome is a phenomenon that takes place during mitosis. It occurs when chromosomes are damaged either by drug treatment or when a damaged cell passes through the G2 checkpoint.
Option d: Anaphase promoting complex (APC) helps in the transition of the chromosome from metaphase to anaphase. The role of APC is that it attaches to the chromosomes aligned at the equator during metaphase and allows the segregation of the chromatids.
Thus, the correct option is d) Chromosomes will not segregate.
Note: It is to be noted that Anaphase-Promoting promotes the onset of anaphase by marking Cyclin B1 and securin for proteasomal destruction.
Recently Updated Pages
Master Class 11 Business Studies: Engaging Questions & Answers for Success

Master Class 11 Economics: Engaging Questions & Answers for Success

Master Class 11 Accountancy: Engaging Questions & Answers for Success

Master Class 11 Computer Science: Engaging Questions & Answers for Success

Master Class 11 English: Engaging Questions & Answers for Success

Master Class 11 Maths: Engaging Questions & Answers for Success

Trending doubts
Which one is a true fish A Jellyfish B Starfish C Dogfish class 11 biology CBSE

Difference Between Prokaryotic Cells and Eukaryotic Cells

1 ton equals to A 100 kg B 1000 kg C 10 kg D 10000 class 11 physics CBSE

One Metric ton is equal to kg A 10000 B 1000 C 100 class 11 physics CBSE

How much is 23 kg in pounds class 11 chemistry CBSE

Net gain of ATP in glycolysis a 6 b 2 c 4 d 8 class 11 biology CBSE
