In response to a stimulus such as pain, a neuron sends a signal to the brain using __________.a. contraction and relaxation


b. electrical signals and chemical neurotransmitters


c. respiration and absorption

d. myosin and actin

Answers

Answer 1
Answer: The answer is b. electrical signals and chemical neurotransmitters.

Electric signals include action potential. When neurons hit threshold and action potential is triggered, the Na+ channels open and Na+ ions enter the neuron. After the depolarization of membrane, Na+ channels inactivate. Consequently, the action potential is generated.

When an action potential reaches presynaptic terminal on a neuron, it will induce a release of neurotransmitters from the neuron. Neurotransmitters pass through the synaptic cleft and bind to the receptor on a postsynaptic neuron.


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Mangrove pneumatophore roots _______.
many scientists are concerned that the Ogallala aquifer in the united states is being depleted at an alarming rate ? what would most likely be a major effect on this aquifer running dry ?
in active progressive muscle relaxation, the muscles are contracted to approximately 100% maximum contractions true or false
In animals, __________ energy is responsible for respiration and other vital functions.a. solarb. kineticc. potentiald. trophic

Which statement best describes why electrons are typically not included when determining the mass of an atom?The charge of a proton cancels the charge of an electron.

The protons and neutrons are much more massive than the electrons.

Electrons have a negative charge.

Electrons are located outside the nucleus.

Answers

Answer:

The correct answer is d = Electrons are outside the nucleus.

Explanation:

Hello ! Let's solve this!

The mass of the atom is measured as the number of protons and neutrons in the nucleus of an atom.

Since electrons are outside the nucleus, they are not counted to know the mass.

The correct answer is d = Electrons are outside the nucleus.

Electrons are located outside of the nucleus

A lack of iron in the blood is an unhealthy condition known as __________________A : Scurvy
B : Rickets
C : Diabetes
D : Anemia
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Answers

d anemia emia means blood condition

the answer is d anemia

This molecule controls cellular activity by directing the synthesis of

Answers

DNA is a molecule that controls cellular activity by directing the synthesis of proteins.

Where DNA is present?

The nucleus contains the cell's DNA and directs the synthesis of ribosomes and proteins. Found within the nucleoplasm, the nucleolus is a condensed region of chromatin where ribosome synthesis occurs.

Thus, DNA is a molecule that controls cellular activity by directing the synthesis of proteins.

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protein synthesis is controlled by DNA

According to most scientists, green algae are the ancestors of plants. Which statement best supports that belief?A. Both have cell walls made of cellulose, store food material as starch, and have chlorophyll a and chlorophyll b.
B. Both are multicellular and haploid, are often found in fossil remains, and have cell walls made of cellulose.
C. Both have cell walls made of cellulose, have xanthophyll as their chief photosynthetic pigment, and are multicellular.

Answers

Answer:

The correct answer is statement A.

Explanation:

Green algae belong to the division Chlorophyta and comprise about 9000 to 12000 species. Like higher plants, green algae possess photosynthetic pigments like carotene, chlorophyll a and b, and xanthophyll, in a similar proportion as found in higher plants.  

A cell of green algae can be sessile or motile, and exhibits a central vacuole, and possesses a two-layered cell wall formed of cellulose and pectin. The storage of food takes place in the form of starch in the pyrenoids. Thus, due to the similarities in the features between the plants and green algae, it is considered that the embryophytes or the lands plants have emerged from green algae. Hence, statement A supports the belief.  

Final answer:

Most scientists believe that green algae are the ancestors of plants due to their similar biochemical features. These include having cell walls made of cellulose, the storage of food material as starch, and the presence of chlorophyll a and chlorophyll b.

Explanation:

According to most scientists, the belief that green algae are the ancestors of plants is best supported by the statement: Both have cell walls made of cellulose, store food material as starch, and have chlorophyll a and chlorophyll b. These characteristics highlight the similar biochemical features that underline the evolutionary relationship between green algae and plants. The presence of cell walls made of cellulose provides structural similarities. Storage of food material as starch indicates similar metabolic processes, and both having chlorophyll a and chlorophyll b reveals their shared capacity for photosynthesis, a defining feature of plants.

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The process of linking monosaccharides to become polysaccharides is called __________, while breaking down polysaccharides, like glycogen, occurs during a process called __________.A: hydrolysis; dehydration synthesis
B: dehydration synthesis; hydrolysis
C: is crossed off
D: hydrolysis; glycolysis

Answers

The right option is B: dehydration synthesis; hydrolysis

The process of linking monosaccharides to become polysaccharides is called dehydration synthesis, while breaking down polysaccharides, like glycogen, occurs during a process called hydrolysis.

Dehydration synthesis is the process of linking two smaller molecules, or compounds, together to form a larger molecule following the loss of a water molecule.

Hydrolysis is the process of using water to break down a molecule such as carbohydrate into its component sugar molecules.


dehydration synthesis (releasing water to make covalent bonds); hydrolysis (using water to break covalent bonds)

20 POINTS!! PLS HELP for Social Studies: Out of all the different ancient lands you have learned about, discuss which one you would like to live in most!

Discuss these points on why:

Trade

Location

Land

Beliefs

Answers

Answer:

Associated with Mesopotamia are ancient cultures like the Sumerians, ... Learning about this time period can be a little confusing because these ... We believe Sumerian civilization first took form in southern Mesopotamia ... them to travel into the Persian Gulf and trade with other early civilizations,

Explanation: