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Simora [160]
2 years ago
13

Chromosomes are strands of ADN wrapped around​

Biology
1 answer:
babymother [125]2 years ago
3 0

Answer:

In the nucleus of each cell, the DNA molecule is packaged into thread-like structures called chromosomes. Each chromosome is made up of DNA tightly coiled many times around proteins called histones that support its structure.

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Suppose a dye for staining cells stains the region where ribosomes are made. what would you expect to see inside the stained cel
ella [17]

The RNA (ribonucleic acid) and the associated proteins forms the ribosomes. These ribosomes are the site of protein synthesis in a cell. Inside the stained cell nucleus, the nucleolus part of the cell can be seen. The nucleolus is the part where the all the ribosomes of the cell are assembled.

Hence, the answer is 'nucleolus'.

5 0
3 years ago
Please help I really need help on this question!!!
Mkey [24]

Answer:

Conduction

Explanation:

convection- not related, as it is hot air rising and cold air falling, which isn't happening.

Subduction- that has to do with the Earth's plates moving

Radiation- doesn't have to do with heated substances.

5 0
2 years ago
Which cell junctions form a barrier to the passage of materials?
kkurt [141]

Answer:

The correct answer is - tight junctions.

Explanation:

Tight junctions are one of the cell-cell junctions that make a barrier to the passage of material which is a present in epithelia. This barrier is impermeable to most of the materials with soluble molecules. This barrier is made up of the occludin and claudin proteins.

Tight epithelia have tight junctions and examples of such junctions are the distal convoluted tubule or DCT, and the collecting duct of the nephron in the kidney.

Thus, the correct answer is - tight junctions.

8 0
3 years ago
What are three types of homologies that can be seen in organisms? Give example of each homologous?
Vaselesa [24]

Answer:

1. Iterative homology: e.g. antenna and leg of fiddler crab

2. Ontogenetic homology: e.g. radular teeth of veliger, feathers of chicken and hen

3. Di-polymorphic homology: e.g. white and brown feathers of hen races, chelae of male and female of fiddler crabs

4. Supraspecific: e.g. chelae of fiddler crab, chelae of lobster, feathers of hen and pheasant

Explanation:

7 0
3 years ago
Scientists now use domain Eukarya to group together the kingdoms of eukaryotic species, which include plants, animals, protists,
sergeinik [125]

Answer: Option A

Explanation:

Scientist used the domain Eukarya which comprises the togetherness of all the eukaryotic species. They have been put together because all of the  eukaryotic species have their recent common ancestor as eukaryotes.

The first eukaryotic cells, which had nucleus originated 2 billion years ago which had organelles. They explain the endosymbiotic theory.Most of the eukaryotic species that have been evolved from this.

Eukaryotic species have been evolved from another eukaryotic species and share some similar characteristics.

7 0
3 years ago
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