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3 years ago

1. Which of the following gases is need by plants?

Biology

2 answers:

Kobotan [32]3 years ago

7 0

Answer: Carbon dioxide

Explanation:

To perform photosynthesis, plants need three things: carbon dioxide, water, and sunlight. for photosynthesis. Carbon dioxide enters through tiny holes in a plant's leaves, flowers, branches, stems, and roots. Plants also require water to make their food.

Diano4ka-milaya [45]3 years ago

5 0

Carbon dioxide because people in other animals exhale carbon dioxide as a waste product. People and other animals need oxygen for plants produce oxygen during an important process called photosynthesis which turns the sun energy into nutrients so carbon dioxide would be the answer.

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This type of membrane transport moves substances against the concentration gradient from an area of low concentration to an area

sashaice [31]

Answer:- Active transport

Explanation:-

There are two types of membrane transports

1. Passive transport - this type of transport occurs without the input of any energy and the molecules move along the concentration gradients that is from high concetration to low concentration.

2. Active transport- this type of transport takes place to move the molecules against the concentration gradient that is from low concentration to high concentration.

The active transport is of two types:

1. Primary active transport- in this type of transport ATP is used as an energy source to move the substances against the concentration gradient.

2.Secondary active transport - in this type of transport the gradient formed by the active transport is utilized and it involves the movement of 2 substances at a time aross the membrane. That is the movement of one molecule is coupled to another.

The membrane proteins that are associated with active transport are called as carrier proteins. These proteins have a binding site for the molecules that they transport. Once they bind to the specific molecules, a conformation change is induced and this leads to the transport of the molecule across the membrane.

So, the active transport is basically responsible for utilizing the energy from ATP and carrier proteins to move the substances across the membrane against their concentration gradient i.e. from low concentration to high concentration.

5 0

3 years ago

List the four types of stem cells, give an

Flauer [41]

Answer:

Totipotent Stem Cells - They can differentiate into any type of human body cell or the placenta.

Example: Fertilized egg cells.

Pluripotent Stem Cells are from totipotent cells and can differentiate into any cell in the human body; however, not many are in the placenta.

Example: Blastocyst cells.

Multipotent Stem Cells - They can only differentiate into closely related cells.

Example: Blood stem cell

Unipotent Stem Cells - They can only produce their type of cell.

Example: Skin stem cells (which can only become a new skin stem cell).

Explanation:

4 0

2 years ago

Neighboring cardiac muscle cells in the walls of heart chambers have specialized cell-to-cell contacts that electrically and mec

IrinaVladis [17]

Answer:

Neighboring cardiac muscle cells in the walls of heart chambers have specialized cell-to-cell contacts that electrically and mechanically link the cells together, permitting the immediate passage of muscle impulses. These cell-to-cell contacts are called intercalated discs.

Explanation:

Intercalated discs can be described as unique structures present between the cardiac muscles of the heart. The intercalated discs play a major role in making the cardiac muscles contract in a rhythm so that the heart can pump blood in a regular fashion and it hence regulates the effective functioning of the heart. The intercalated discs are the structures that join on cardiac muscle to another and is involved in the transmission of chemical messages between them.

8 0

3 years ago

Why is a salt dissolved in ocean water and not considered a mineral?

VMariaS [17]

Because people throws trash into rivers and stuff and they flow down into the ocean and makes it unclean

7 0

3 years ago

Does cancer usually begins when mutation changes the normal cell cylce

quester [9]

Cancer can start when just one of them begins to grow and multiply too much. The result is a growth called a tumor. Benign tumors are localized growths - they only cause problems if they put pressure on nearby tissues, such as the brain.

4 0

2 years ago