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timofeeve [1]
1 year ago
15

When a eukaryotic cell is not undergoing mitosis, the dna and its associated proteins appear as a visible network of dark fibers

called the?

Biology
1 answer:
OlgaM077 [116]1 year ago
5 0

Answer

          When a eukaryotic cell is not undergoing mitosis, the DNA and its associated proteins appear as a visible network of dark fibers called the Chromatin.

Definition

               Chromatin is a thread like structure that can be seen inside nucleus before cell division. It is a complex of DNA and histone proteins.  

Forms of chromatin

                    Chromatin exist in two forms, that is  

a. Euchromatin

                     It is less condensed and can be easily transcribed.

b. Heterochromatin

                     It is highly condensed and not transcribed as easy.  

Organization of chromatin

                    Microscopy has shown the appearance of chromatin as beads on a string. The beads are called nucleosomes.  

Nucleosome

                    Each nucleosome is composed of DNA wrapped around eight histone proteins. The nucleosome is then wrapped into a 30nm spiral called solenoid.


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Match each phrase with the correct answer. Group of answer choices Organism in a lichen that provides protection [ Choose ] Orga
jekas [21]

Answer:

Organism in a lichen that provides protection - algae

Organism in a lichen that provides nutrients through photosynthesis - algae

Branched growth form of lichen - fruticose

Leafy growth form of lichen - foliose

Small and flat growth form of lichen - crustose

Explanation:

<em>Lichens are composite organisms that are formed from symbiotic relationships between fungi and cyanobacteria/algae. The Green algae layer offers food to the fungi by photosynthesis while the latter supplies nutrients and offers protection to the algal component. </em>

There are different types of lichen based on the growth structure:

Fruticose lichens grow upright and shrubby and posses either round or flat branches.

Foliose lichen appears like a leaf with upper and lower layers. They are usually flat or convoluted in nature.

Crustose lichens are small in appearance with flat, crusty growth on surfaces on which they grow.

5 0
2 years ago
Which of the following genes would not likely be encoded on a plasmid?
raketka [301]

Answer:

gene encoding enzymes for glycolysis.

Explanation:

Plasmid may be defined as an extra chromosomal circular DNA that replicate independently of the main chromosomal material. Plasmid are generally used for the manipulation of genes in molecular technologies.

Plasmid can encode gene for toxins, antibacterial resistance and for the unusual substrate degradation. The plasmid cannot code enzyme for glycolysis because these enzymes are already present in the host organisms. Glycolysis enzymes are independent on the plasmid regulation.

Thus, the correct answer is option (3).

7 0
2 years ago
The chief force pushing water and solutes out of the blood across the filtration membrane is A) the ionic electrochemical gradie
Marysya12 [62]
<h2>C) option is correct </h2>

Explanation:

  • Glomerular filtration is the process which kidneys uses to filter excess fluid and waste products out of the blood into the urine collecting tubules of the kidney, so that they may be eliminated from the body
  • The rate at which kidneys filter blood is called the glomerular filtration rate
  • The main driving force for the filtering process, or outward pressure is the blood pressure as it enters the glomerulus, this is counteracted to some extent by inward pressure due to the hydrostatic pressure of the fluid within the urinary space, and the pressure generated by the proteins left in the capillaries that tend to pull water back into the circulatory system (colloidal osmotic pressure)
  • The net filtration pressure is the outward pressure minus the inward pressure
3 0
2 years ago
A land-dwelling organism, A, and an aquatic single-celled organism, B, are represented below.
Sergio039 [100]

Using the image that represents the land-dwelling organism and an aquatic single celled organism. The statement that best explains how A and B are able to survive in their environments is…


Answer: A) The organelles in B perform similar functions to the organ systems in A.


Please see image attached to better understand how we arrived to the conclusion.


<span>I hope it helps, Regards. </span>

8 0
2 years ago
A rock sample has a mass of 16 grams and a volume of 8 cubic centimeters. When the rock is cut in half, what is the volume and d
spayn [35]

Answer:

Volume= 4 cm³

Density= 2 g/cm³

Explanation:

We have the following data:

volume= V= 8 cm³

mass= m= 16 g

The density is the mass per volume of a substance, so the density of the rock is:

density= d= 16 g/8 cm³= 2 g/cm³

When we cut the rock in half, we have a half volume and a half mass:

V= 8 cm³/2= 4 cm³

m= 16 g/2= 8 g

But the density is not altered because it is an intrisic property - it does not change with the amount of subtance. Thus, the density of a half rock is:

d = m/V= 8 g/4 cm³= 2 g/cm³

6 0
1 year ago
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