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3 years ago

Movement of the chromosomes during anaphase would be most affected by a drug that

Biology

1 answer:

My name is Ann [436]3 years ago

4 0

Answer:

The options are missing, the options are:

A) prevents the duplication of centrosomes. B) prevents nuclear envelope fragmentation C) prevents shortening of microtubules. D) prevents attachment of the microtubules to the kinetochore. E) prevents nucleosome formation

The answer is C

Explanation:

Cell division is a characteristics of all living cells. Whether meiosis or mitosis, the chromosomes separate in the Anaphase stage. Prior to the anaphase stage is the metaphase, where spindle microtubules attach to the kinetochores of each chromosome and aligns them at the centre of the cell called METAPHASE PLATE.

Thus, since the aligning of chromosomes at the metaphase plate has to do with attachment of microtubules to chromosomes' kinetochores, the drug that will hinder movement of chromosomes to opposite poles will not stop formation of microtubules. Instead, it will prevent the formed microtubules attached to each chromosome from shortening, as it is the shortening of microtubules that facilitates the pulling apart of the chromosomes they are attached to.

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Name 3 things food is used for in your body after it is broken down.

Shtirlitz [24]

After break down food may be used in the body to provide energy, as building blocks for tissue and cells, and can be stored for future use.
The body uses food for energy, for growth by making new cells and repairing or replacing tissues, may be stored by converting it into glycogen or fat before they can be stored. The main types of foods are carbohydrates, proteins and fats.

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3 years ago

if two different types of particles have the same speed in a medium,why is chromatography process not suitable? write with a rea

vekshin1

Explanation:

When using chromatography, the 2 solutes in the solvent paper should have different Rf values from the base line to identify them as different compounds.

If they were to have the same speed in the solvent, they would appear as 1 dot instead of 2 separate dots, which is a false reading.

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3 years ago

A group of cells is assayed for DNA content immediately following mitosis and is found to have an average of 4 picograms of DNA

damaskus [11]

Answer:

b: 8;8

Explanation:

Mitotic or meiotic cell division constitute the m phase of the cell cycle. At the end of the m phase, the new cells enter the interphase stage of the cell cycle. The interphase is further sub-divided into;

the $G_0$ phase,
the $G_1$ phase,
the S phase; and
the $G_2$ phase.

The $G_0$ phase is essentially a resting phase. Cells that do not need to divide except when necessary move into this phase after exiting the m phase.

Actively dividing cells enter the $G_1$ phase after exiting the m phase. Cell development and growth takes place. From there, the cells enter the S phase where DNA replication/synthesis takes place. The cells then enter the $G_2$ phase where proteins are synthesized in preparation for division or m phase.

At the S phase, the amount of DNA a cell carries is doubled but the chromosome number remains the same. For example, if a cell enters the S phase with 2 g of DNA containing 10 chromosomes, at the end of S phase, the amount of DNA would have come 4 g while the number of chromosomes will remain 10.

Hence, if the average amount of DNA in the assayed cells immediately after mitosis is 4 picograms, the amount would be 8 picograms at the end of S phase and will still remains 8 picograms at the end of $G_2$ phase.

The correct option is b.

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3 years ago

________ are neurons in the brain's visual system that respond to particular features of a stimulus.

forsale [732]

Answer:

The cells of the visual cortex are neurons in the brain's visual system that respond to particular features of a stimulus.

Explanation:

These neurons respond to stimuli presented to both eyes. Simple cells receive innervation directly from thalamic cells and respond to light stimuli with defined orientation and with specific configuration and location in the visual field. Complex cells also respond to the orientation parameter.

These cells trigger action potentials when the visual stimulus appears within their receptive field.

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3 years ago

If the producer level of the energy pyramid start with 5000 calories how many calories will transfer to the secondary consumers

Strike441 [17]

Explanation:

Only 10% of calories will be transfered to the next higher level.

5000 * 0.1 = 500.

500 calories will transfer to the secondary consumers.

8 0

3 years ago