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Otrada [13]
2 years ago
6

You are looking through a microscope at onion cells and you see a cell with the sister chromatids lined up across the middle of

the cell. what phase of mitosis are you observing?

Biology
2 answers:
frutty [35]2 years ago
8 0
The phase of mitosis is called Metaphase
barxatty [35]2 years ago
3 0

Answer:

The correct answer would be Metaphase.

The metaphase is the second stage of the mitosis during which all the sister chromatids are arranged at the imaginary central line termed as metaphase plate.

The centromere of each chromosome is attached with two microtubules coming from the opposite ends of a cell.

It helps in equal distribution of sister chromatids into two daughter cells.

Once the metaphase passes the cell cycle checkpoint, the cell progress to anaphase.

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Briefly describe how lateral inhibition increases apparent contrast at edges. In your response be sure to discuss the role of li
rusak2 [61]

Answer and Explanation:

The retina covers the internal phase of the eye. It characterizes by its complex interaction between many morphologically and functionally different cells, which are located in many layers. The principal processing mechanism in the retina is lateral interactions among cells, and the most common lateral processing is lateral inhibition.

Photoreceptors are those cells that receive the light and translate the luminous signal into an electrical signal. These are the cones and sticks.

The horizontal cells intervene in the lateral spatial interaction between photoreceptors.      

Bipolar cells receive information from the photoreceptors and from the horizontal cells and transmit it to the most internal layers in the retina.

The retina is stratified into five layers. One of these is the external plexiform layer, a contact zone between photoreceptors, horizontal cells, bipolar cells, and other cells.    

In the vertebrates´ retina, the lateral inhibition is produced for the first time in the external plexiform layer, through the horizontal cells. These cells connect to photoreceptors, other horizontal cells, and bipolar cells. The connection between horizontal cells might reduce or amplify the photoreceptor answer, and this last one is transmitted by the bipolar cells to the interior of the retina. In photoreceptors, there are two connections to horizontal cells, a direct connection, and an indirect one. The connection between photoreceptors, horizontal cells, and bipolar cells is known as lateral inhibition. By this inhibition, photoreceptors allow the contrasting perception in an image. Lateral inhibition allows discriminating one stimulus from other stimuli, by enhancing contrast and definition. The inhibitory modulation is produced by the inhibitor neurotransmitter GABA.The spacial extension of lateral inhibition changes according to the adaptation to light. Gap junction between horizontal cells and between photoreceptors and horizontal cells might vary with the amount of light.                      

4 0
3 years ago
Stick insects, also called walking sticks, are typically found in tropical and subtropical forests and grasslands. The insects a
nikitadnepr [17]

Answer:      adaptation

Explanation:

3 0
2 years ago
Read 2 more answers
If a sample of air contains 1 g/kg of water vapor and has a relative humidity of 25 percent at -5 degrees Celsius how much water
guapka [62]

Answer:

Option C

Explanation:

As we know that

Relative humidity (RH) is defined as the ratio of amount of water vapor present in a given sample of air to the maximum amount of water that can be  absorbed by the same sample of air to attain saturation  at a particular temperature .

Thus,

RH = \frac{X}{Y} \\

Where X represents the current amount of water vapor present in a given sample of air

and Y represents the maximum amount of water that can be  absorbed by the same sample of air to attain saturation  at a particular temperature

Substituting the given values in above equation we get -

0.25 = \frac{1 g/Kg}{Y} \\Y = \frac{1 g/Kg}{0.25} \\Y = 4 g/Kg

Hence, option C is the correct answer

4 0
2 years ago
The means of mass communication such as television, radio, newspapers, and the internet, are collective known as the _____.
Luda [366]

Answer:

The answer is D

Explanation:

8 0
2 years ago
Which of the following is a false statement?
Yuki888 [10]

the answer is A. because it is right

8 0
3 years ago
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