Which of the following was likely present in Earth's early atmosphere over four billion years ago?

Where does transcription take place in eukaryotic cells

S_A_V [24]

Answer:

Transcription occurs the nucleus of eukaryotic cells

6 0

3 years ago

Can someone help with the labels for this ?

JulsSmile [24]

Answer:

Refer to the attached image for correct labeling.

Explanation:

The diagram is of a plant cell and its organelles.
The nucleus houses the genetic material and controls all life processes.
A plant cell contains one large vacuole in the center that stores water and nutrients.
Chloroplast is the site for photosynthesis. It captures light and utilizes it and carbondioxide to produce glucose.
Mitochondria are called the power house of the cell. Through a process called cellular respiration, they break down the glucose produced in photosynthesis into energy compounds such as ATP as well as oxygen and water.
The endoplasmic reticulum is the site for protein sysnthesis. It contains two parts: the rough endoplasmic reticulum (RER) which contains ribosomes that synthesize proteins and the smooth endoplasmic reticulum (SER) which packages the proteins into transport vesicles.
The nucleus contains the nucleolus that is the site for ribosome assembly.
The cell membrane is a semi-permeable membrane that covers the cell and controls cellular transport.
The cell wall is a hard, outer covering that protects the cell and maintains its structure and shape.

6 0

3 years ago

HELP!! DNA was isolated from water samples taken from six different sites. This gel

VladimirAG [237]

After running DNA in a gel, bands of different sizes and species might appear. Scientists know silver carp are at North Shore site 1 because one of the bands in lane 1 matches a band in the positive control (Option C).

When DNA was isolated and run in a gel, many bands migrated to different points.

These bands were the different-sized fragments of DNA samples from different species from the six sites.

Researchers wanted to figure out where the silver carp is.

To do it, they needed to identify the bands on the gel that belonged to the silver carp DNA, so they included negative and positive controls to make comparisons.

<h3>Positive and negative Controls</h3>

Negative and positive controls guarantee the interpretations of the results.

The positive control shows the band sizes that belong to the silver carp DNA.

Any band in the sampling sites that matches one of the positive control bands indicates that the species is present at that site.

The negative control is the opposite. It is the absence of the species' DNA.

<h3>Results interpretation</h3>

As we can see, there are four sites where the bands match one of the bands of the positive control. These are,

North shore site 1
Chicago site 1
Calumet site 1
Calumet site 2

This means that at these four sites, the silver carp is present.

So scientists know silver carp are at North Shore site 1 because one of the bands in lane 1 matches a band in the positive control (Option C).

By looking at the lane of the North Shore site 1, we can also see another band (Thinner and grey). But this band does not match either of the positive control bands. This result suggests that the grey band belongs to another species' DNA.

You can learn more about gel electrophoresis at

brainly.com/question/9437877

brainly.com/question/895793

4 0

3 years ago

The actual separation or division of the parent cell is called _____.

Anna71 [15]

The separation or division of the parent cell is called cytokinesis

8 0

3 years ago

Read 2 more answers

Describe how the capillaries are adapted to allow this process to happen efficiently.

Svetach [21]

Capillaries are one cell thick and so this makes them very thin. capillaries are also arranged in networks known as capillary beds, and thus multiple capillaries are spread over a large area.

7 0

3 years ago