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3 years ago

Which is consider a chemical mutagdn

1 answer:

8 0

the one that is considered a chemcial mutagen is : Tobacco Chemical mutagen refer to the substance that affected the DNA of those who consume the substancce or their offspring. Studies showed that consuming tobacco has proven to created DNA deformations for the fetus if it consumed by pregnant women.

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The two amino acids animated above are joined together by a ?

Bogdan [553]

Most likely a hydrogen bond?

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3 years ago

Read 2 more answers

PLEASE HELP

KatRina [158]

The correct options are as follows:
1. D.
Natural selection refers to the process by which living organisms that are more adapted to their environments usually survive and produce offspring that are like them. In the case of giraffes, the giraffes with the longest necks were able to survive in their environment and they reproduce offspring that are like them.
2. D
In the scientific world, scientists have open minds and they welcome all new ideas. These new ideas have to be tested to ensure that they are correct and superior to the facts that are already known. When a new hypothesis is put forward by a scientist, many scientists all over the world will test the hypothesis is order t confirm if it correct. If the hypothesis is found to be correct it will be accepted by all scientists.
3. A.
DNA test is a laboratory analysis that can be used to assess the level of relationship between living organisms. Related living organisms usually have some similar genes in their DNA, the level of closeness of these organisms will determine the quantity of similar genes that will be found in their DNA. Unrelated organisms on the other hand will have little or no similar genes in their DNA.
4. C.
The genetic code is the same across species, this fact points to the possibility that all living organisms originated from common ancestors. This support the evolution theory which stated that all living organisms descended from a common ancestor.
5. B.
Antibiotic drugs are usually effective against bacteria and other microbes, but the microbes can evolve and develop resistance to these drugs. Microbes are considered to have evolved when drugs that are used to inactivate them before no longer have any effect on them, thus they can easily survive in the presence of the drugs.
6. B.
If a particular specie of animal is able to avoid predators, it will increase in number more that those that are prey on by predators. The kings snakes were probably able to avoid predators, that is why, they were able to survive, reproduce offspring and increase in population in that particular ecosystem.

4 0

3 years ago

Match the cell adhesion or junction with the appropriate choice. Drag the terms on the left to the appropriate blanks on the rig

pav-90 [236]

Answer:

The missing options are:

A) protein subunits associated with gap junctions.

B) a type of adhesive junction connecting an epithelial cell to the basal lamina.

C) collection of fibrous intracellular attachment proteins.

D) create a permeability barrier.

E) button-like points of strong adhesion between two cells.

F) hollow cylinders associated with gap junctions.

G) type of adherens junction connecting cells with the extracellular matrix.

H) intermediate filaments associated with plaques.

I) collection of adherens junctions particularly associated with epithelial cells.

J) type of adhesive junction containing actin microfilaments.

K) specialized modifications of the cell membrane in which two cells come together in multicellular organisms.

L) point of cytoplasmic contact between two cells.

M) anchors cytoskeleton of one cell with that of a neighboring cell.

Set of answers are:

A) protein subunits associated with gap junctions. Conexin

B) a type of adhesive junction connecting an epithelial cell to the basal lamina. Hemidesmosome

C) collection of fibrous intracellular attachment proteins. Plaque

D) create a permeability barrier. Tight junctions

E) button-like points of strong adhesion between two cells. Desmosome

F) hollow cylinders associated with gap junctions. Connexons

G) type of adherens junction connecting cells with the extracellular matrix. focal adhesion

H) intermediate filaments associated with plaques. Tonofilaments

I) collection of adherens junctions particularly associated with epithelial cells.

J) type of adhesive junction containing actin microfilaments. Adherens junctions

K) specialized modifications of the cell membrane in which two cells come together in multicellular organisms. Cell junctions

L) point of cytoplasmic contact between two cells. Gap junction

M) anchors cytoskeleton of one cell with that of a neighboring cell. Adhesive junction

Explanation:

Connexin: is a transmembrane protein that forms the gap junctions, they are also called gap junctions proteins.

Hemidesmosome junctions: these types of junctions are in the epidermis, specifically between the epithelial cells and the basal lamina of the epidermis.

Plaque: they are part of the adherens junctions, they are fibrous proteins that are attached to certain points of the extracellular matrix.

Tight junctions: are junctions between two epithelia, they are very restrictive and do not allow the passage of soluble molecules creating a permeability barrier.

Desmosomes: are very strong cell to cell junctions on the lateral sides of plasma membranes. They are in tissues that are under mechanical stress, such as the cardiac muscle.

Connexons: is a pore made of six connexin proteins in a gap junction. Connexons are the ones that connect two cells in gap junctions.

Focal adhesions: They connect the extracellular matrix with the cell, regulatory signs and mechanical force is transmitted through them.

Tonofilaments: tonofilaments are the ones that are associated with a plaque in adherens junctions, they are in epithelial tissues.

Adherens junctions: are cell to cell junctions where the cytoplasmatic face is connected to the actin cytoskeleton. They appear as spots forming the plaque or as zonula adherens, which are actin bands around the cell.

Cell junctions are protein complexes that connect two cells that are next to each other or a cell with the extracellular matrix. They have a lot of functions, such as pas information from cell to cell, or the exterior, form a barrier, synchronize cells, etc.

Gap junctions: are connections between the cytoplasm of two cells, molecules and, ions pass directly from one cell to the other.

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3 years ago

Protists use cilia to move within their habitat, but ciliated human cells like those in the bronchi are always anchored to one a

ahrayia [7]

They give extra surface area to be able to collect more oxygen molecules.

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3 years ago

How are bacteria able to adapt to a rapidly changing environment?

shtirl [24]

They adapt because they can replicate quickly (have many generations within short period of time) and accumulate mutations. Mutations in their genetic information allows them to bypass the host's immune system or resist to antibiotics. These mutations are successfully carried to the next generations of bacteria and allows them to thrive in their new environments.

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3 years ago