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2 years ago

When is cell-to-cell communication particularly important in regulating gene expression?

2 answers:

7 0

Cell-to-cell communication is particularly important in regulating gene expression during the embryonic development.

Cells in the developing embryo are constantly communicating with their neighbors. The molecules used by them in sending and receiving signals are crucial for normal embryogenesis. Various intracellular signaling pathways have been discovered, some of which are activated in response to secreted growth factors.

However, a few important signaling pathways are used often during embryonic development to regulate various cellular processes that shape the developing embryo.

Embryonic development is marked by the thorough regulation of cellular functioning so that the cells proliferate, migrate, differentiate, and form tissues at the correct place and time. These processes are genetically controlled and depend both on the history of cells, their lineage, as well as on the activities of signaling pathways, which coordinate the cell interactions leading to organogenesis.

To learn more about embryonic development here

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saveliy_v [14]2 years ago

7 0

Answer:

during embryonic development

Explanation:

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Which of the following describes the effect of global climate change on biodiversity: Rising ocean water temperatures have incre

jasenka [17]

Answer:

Warm temperatures and more frequent dry periods have stressed frog species such as the coqui making them more vulnerable to a lethal fungal infection thus reducing their populations.

Explanation:

Rise in temperature, flooding as well as drought affect biodiversity. As climate changes, there is usually an alteration of temperature as well as weather patterns, the impact is felt by

plant and animal life. According to

Scientists, there is an expectation that

number and range of species, which are regarded as biodiversity will experience declination with greatly increase in temperatures

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3 years ago

Hydrogen is the simplest element it has an atomic number of 1. There are three hydrogen isotopes: H1, H2, and H3. Explain how th

Archy [21]

All isotopes of hydrogen will always contain one proton, as a change in the amount of protons will change the substance. Assuming all isotopes aren’t ions and therefore don’t have a charge, then each of these isotopes has one electron. The only difference between them is the amount of neutrons to account for the different atomic masses.

H1
one proton
one electron
zero neutrons

H2
one proton
one electron
one neutron

H3
one proton
one electron
two neutron

4 0

3 years ago

What factors determine a nation's human development index (hdi)?

alisha [4.7K]

These are the factors that determine a nation's human development index (HDI):

1. Average life and health expectancy

2. Education- literacy rates, and ratio of students who are enrolled in primary, secondary and tertiary levels

3. Individual income- a person’s income against the gross domestic product (GDP)

4 0

4 years ago

Read 2 more answers

Are microorganisms best suited for dry, warm environments?

gregori [183]

Answer:

The most significant effect of the microbes on earth is their ability to recycle the primary elements that make up all living systems, especially carbon, oxygen, and nitrogen (N). Primary production involves photosynthetic organisms which take up CO2 from the atmosphere and convert it to organic (cellular) material.

5 0

2 years ago

Antibodies are proteins that have a lock-and-key recognition for their antigen established by the antigen-binding site on the an

Anna [14]

Question is incomplete. Complete Question is as follows.

Antibodies are proteins that have a lock-and-key recognition for their antigen established by the antigen-binding site on the antibody. Match the antibodies in the left column to the appropriate blanks in the sentences on the right.

neither anti-A nor anti-B

anti-O

anti-AB

anti-A

anti-A and anti-B

anti-B

1) People who have the A antigen on the surface of their red blood cells have __________antibodies in their plasma.

2) People who have the B antigen on the surface of their red blood cells have ___________ antibodies in their plasma.

3) People who have both A and B antigens on the surface of their red blood cells have ____________ antibodies in their plasma.

4) People who have neither A nor B antigens on the surface of their red blood cells have _________ antibodies in their plasma.

Answer:

1) People who have the A antigen on the surface of their red blood cells have anti-B antibodies in their plasma.

2) People who have the B antigen on the surface of their red blood cells have anti-A antibodies in their plasma.

3) People who have both A and B antigens on the surface of their red blood cells have neither anti-A nor anti B antibodies in their plasma.

4) People who have neither A nor B antigens on the surface of their red blood cells have both anti-A and anti-B antibodies in their plasma.

Explanation:

The antigen present on the surface of the RBC determines the blood group of the person.

The type of antigen present on the RBC determines that which antibody will be present in the blood. Always opposite antibody is present in the blood in order to prevent the reaction of antigen antibody and prevent agglutination.

For example For A antigen , anti A antibody will never be present, always anti-B antibody will be present because if anti-A antibody will be present, it will react with the A antigen resulting in the agglutination of the blood.

similarly all the other blood group antigens are varying with the antibodies.

4 0

3 years ago