1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
abruzzese [7]
3 years ago
13

Whether during mitosis or meiosis, sister chromatids are held together by proteins referred to as cohesions. Such molecules must

have which of the following properties:
1. They must be removed before sister chromatids or homologous
chromosomes can separate.
2. They must be removed before meiosis can begin.
3. They must reattach to chromosomes during G1.
4. They must be intact for nuclear envelope re-formation.
5. They must persist throughout the cell cycle.
Biology
1 answer:
scoundrel [369]3 years ago
8 0

Answer:

1. They must be removed before sister chromatids or homologous chromosomes can separate

Explanation:

During the S-phase of the cell cycle, not only does DNA have to be replicated, but also newly synthesized DNA molecules have to be connected with each other. This replicated DNA (sister chromatids) remain physically connected with each other from S phase until metaphase. This physical connection is called Sister chromatids cohesion.

Sister chromatid cohesion depends on COHESIN, a tripartite protein complex that forms a ring structure to hold sister chromatids together during mitosis and meiosis. Cohesin regulates the separation of sister chromatids during cell division, either mitosis or meiosis. This sister chromatid cohesion is essential for the biorientation of chromosomes on the mitotic or meiotic metaphase spindle, and is thus an essential prerequisite for chromosome segregation. Without the cohesion, sister chromatids would not be segregated symmetrically between the forming daughter cells, resulting in aneuploidy.

Cohesion is established during S-phase of DNA replication, and the cohesins hold the sister chromatid together after DNA replication until anaphase when the removal of cohesin leads to separation of sister chromatids (meiosis II and mitosis) and homologous chromosomes (meiosis I).

You might be interested in
The lymphatic capillaries function to absorb the excess protein-containing interstitial fluid and return it to the bloodstream.
Vera_Pavlovna [14]

Answer:

True

Explanation:

The lymphatic capillaries have the role to drain extracellular fluid, more precisely the interstitial fluid that surrounds cells. Lymph capillaries process the interstitial fluid, collect  it together with the white blood cells and form a lymph. Formed lymph is then transported into a lymphatic vessel, which is connected to a lymph node. Lymph is at the end returned to the venous circulation.

5 0
3 years ago
What response is triggered by distension of the stomach
REY [17]
If you have a distension of the stomach that can mean one 4 or more things. you ate something bad or old. you spun around in circles and feel like throwing up. you get a headache and you feel sick from your stomach. you got a stomachache
5 0
3 years ago
Tyson decides to travel overseas, but he does not get all the needed vaccines before he goes on the trip. while on his trip, he
PilotLPTM [1.2K]
The type of glial cells are particularly at risk from the disease are the Schwann cells.  This disease is caused by a bacterium, Corynebacterium diphtheriae, and is caused when the bacteria releases a toxin, or poison, into a person's body. The Schwann cells produces insulating myelin sheath that covers the axons of many neurons. These cells may suffers immune or toxic attacks with diphtheria infection. 
6 0
3 years ago
Members of two different species possess a similar-looking structure that they use in a similar fashion to perform the same func
Misha Larkins [42]

Answer:

By identifying the bones as being homologous structures and by proposing that humans, bats, and dolphins share a common ancestor.

Explanation:

4 0
3 years ago
where in a stem cell of an embryo is the instructions for how to build organs?  a. ribosomes  b. endoplasmic reticulum  c. Go
Anna35 [415]

Answer:

. In the nucleus.

Explanation:

The information for all bodily functions resides in DNA in every cell.

5 0
3 years ago
Read 2 more answers
Other questions:
  • Which structure receives food directly from the stomach, where it is mixed with strong digestive juices from the liver and pancr
    15·1 answer
  • Jamaal has to make an important phone call. unfortunately, his cell phone is not charged and he has to use his landline, which d
    15·1 answer
  • Based on depth and distance from the shoreline,how many zones are found in ponds and lakes?
    15·2 answers
  • To what organ does the umbilical vein lead
    7·1 answer
  • How does a bony fish use the swim bladder?
    6·1 answer
  • What happens during the S phase of the cell cycle?
    11·1 answer
  • The oxygen produced by the first photosynthesis autotrophs
    5·2 answers
  • In module 1 you learned about homeostasis. what are four ways the skin helps an individual maintain thermoregulation? make sure
    15·2 answers
  • 3. Answer the following in one sentence.
    5·2 answers
  • The above diagram illustrates how nature recycles what natural resources?
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!