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3 years ago

A Vaccine normally given to children against Tuberculosis

1 answer:

5 0

Bacille Calmette-Guérin (BCG) is a vaccine for tuberculosis (TB) disease. This vaccine is not widely used in the United States, but it is often given to infants and small children in other countries where TB is common. BCG does not always protect people from getting TB.

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A scientist is trying to discover a new treatment to stop cancer cells from

charle [14.2K]

Answer:

mitosis is the correct answer

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3 years ago

What are the differences in their hard parts, distribution, reproduction among phytoplankton of cyanobacteria, diatom, coccolith

Margarita [4]

Answer:

Explanation:

DIFFERENCES BETWEEN HARD BODY PARTS.

•Cyanobacteria have calcified sheaths.

• Diatoms have hard but porous cell wall.

• Coccolithophores have hard body parts.

• Silicoflagellates skeleton is composed of opaline silica.

• Dinoflagellates do not have hard body parts

• Green algae - no hard body parts.

• Brown algae - no hard body parts.

DIFFERENCES BETWEEN DISTRIBUTION

• Cyanobacteria are found almost in every terrestrial habitat on planet.

• Diatoms are found in oceans, freshwater, soil and damp.

• Coccolithophores are exclusively marine.

• Silicoflagellates are found in marine environment.

• Dinoflagellates are both freshwater and marine.

• Green algae grow on objects that do not move such as substrate, rock.

• Brown algae - wide distribution from tropical to polar zones.

DIFFERENCES BETWEEN REPRODUCTION.

• Cyanobacteria - asexually by binary or multiple fission, fragmentation, spore formation.

• Diatom - asexually by cell division through mitosis.

• Coccolithophores - asexually by binary fission.

• Silicoflagellates - asexually

• Dinoflagellates - asexually

• Green algae - sexually or asexually by cell division, fragmentation, spore formation.

• Brown algae - sexually and asexually.

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3 years ago

Biologists sometimes say that “natural selection depends on the specific environment where a species lives.” What does this stat

denis23 [38]

Answer: Natural selection is one of the forces of evolution and the enviroment where the species lives is the selection agent. For example, suppose a mosquitoes population in a environment free from insecticides, in this environment there's a high frequency of non-resistant mosquitoes because the environment is not exerting any pressure on the resistence trait. But when the environment changes and we use a insecticide upon the mosquitoes population, the populations changes because the non-resistant ones die but those resistant survive and beggin to reproduce more effectively. That's natural selection, differences in survival and reproduction between individuals with different phenotypes (traits) and this differences depend of environmental changes.

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3 years ago

Semipermeable cell membranes are made of phospholipids that form a bilayer. What major benefit does this arrangement of the memb

Andrej [43]

Answer:

The correct answer would be c. The cell has a greater level of structural support.

Phospholipds are the structural units of a cell membrane. They are consist of two components; hydrphobic lipids and hydrophylic polar heads.

They make a bilayer structure in which polar heads are in contact with water and lipid part are embedded within the layer.

Lipid bilayer gives the rigidity or shape to the cell.
It isolates the cell from the sorroundings.
It is semi-permiable in nature and thus prevents or control the movement of substances across the membrane.
Being liquid in nature, the cytoplasm would have dispersed in the surrounding in absence of cell membrane.

Hence, most appropriate choice would be c. The cell has a greater level of structural support.

5 0

4 years ago

Read 2 more answers

During the process of _____, two rails or sides break apart and pair up with RNA nucleotides, assembling mRNA.

icang [17]

Hey friend!
You stuck?

Replication is the process of DNA formation while Transcriptions is the process of RNA formation from DNA.

Hope this helps!

7 0

3 years ago

Read 2 more answers

A Vaccine normally given to children against Tuberculosis​

A Vaccine normally given to children against Tuberculosis