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motikmotik
3 years ago
12

Q4.4. Which statement below about nucleotides is TRUE?

Biology
1 answer:
fomenos3 years ago
6 0

Answer:

Base pairing occurs via hydrogen bonds between bases in complementary strands of DNA.

Explanation:

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What is silica used for?
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Vast away of industries, like the other person said they said more
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2 years ago
The protostome developmental sequence arose just once in evolutionary history, resulting in two main subgroups—Lophotrochozoa an
Lelechka [254]

Answer:

<h2>c. Division of these two groups occurred after the protostome developmental sequence appeared. </h2>

Explanation:

  • Protosomes are such types of organisms in which the mouth part developed first during embryonic development.
  • Those animals in which anus develop first are known as deuterostomes.
  •  This differentiation takes place during the embryonic development of the organisms.
  • Since lophotrochozoan and Ecdysozoa both are protostomes animals and categorized on the basis of molecular evidence.
  • Thus these two groups were formed after the appearance of the protostomes.

8 0
3 years ago
Describe animal interactions that affect populations in the tundra ecosystem. (Please help please... I have already had a mental
GenaCL600 [577]

Answer:

Herbivorous animals are unable to feed and end up migrating to other regions in search of food.

Explanation:

The tundra is a type of vegetation composed almost exclusively of mosses and lichens. This type of vegetation is found in regions with a polar climate. It is important to note that the tundra has a very fast vegetative cycle. That's because it freezes quickly and can be covered with ice all winter. This ends up modifying the lives of some animals that feed on this vegetation. These animals end up with unavailability of food and need to migrate to others in search of food.

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2 years ago
The most violent volcanic activity is associated with
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3 years ago
Is the movement of water along the concentration gradient
Nuetrik [128]

Answer:

<em>- Is the movement of water along the concentration gradient: </em><em>Osmosis</em><em>. </em>

<em>- Is the use of energy to move the particles against the concentration gradient: </em><em>Active transport</em><em>. </em>

<em>- Is the movement of particles by diffusion without energy: </em><em>Simple diffusion</em><em>. </em>

<em>- Is the movement of particles along the concentration gradient: </em><em>Passive transport</em><em>.</em>

Explanation:

The mechanisms of cellular transport involve all the processes that the cell carries out to incorporate substances into its interior or send them to the extracellular space, through its semipermeable cell membrane.

<h3>- Osmosis</h3>

Is a type of transport that consists of the passage of water from a space with a lower concentration of solutes to one with a higher concentration, in order to reach equilibrium, following a concentration gradient.

The concentration gradient is given by the difference in concentration between two substances, which indicates the direction in which molecules, such as water, should move from one place to another.

<h3>- Active transport</h3>

Unlike passive transport mechanisms, which depend on a concentration gradient that determines the movement of particles, in active transport there are two characteristics that define it:

The passage of substances into the cell against a concentration gradient.

The use of energy to carry out this process.

In this case, the passage of substances through the cell membrane will be according to the requirements of the cell, or when they cannot pass through the membrane.

<h3>- Simple diffusion</h3>

According to the characteristics of the cell membrane, some substances can pass freely through it while others require special mechanisms. When a molecule is able to pass through the membrane without the use of special mechanisms or energy we speak of simple diffusion.

In a cell membrane, whose composition is by hydrophobic or non-polar lipid molecules, simple diffusion allows the passage of non-polar molecules, gases and alcohol.

<h3>- Passive transport</h3>

Refers to the mechanism of entry and exit of substances from the cell that does not require the use of energy.

The mechanisms involved in the passive transport of the cell are simple diffusion, osmosis, facilitated diffusion - which requires special conveyors or channels - and ultrafiltration, which depends on hydrostatic pressure. Examples of substances using this mechanism are lipid molecules, water and electrolytes.

Learn more:

Lipidic bilayer and cellular transport brainly.com/question/6955159

3 0
3 years ago
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