Answer: Excitatory neurotransmitters have excitatory effects on the neuron. This means they increase the likelihood that the neuron will fire an action potential. Inhibitory neurotransmitters have inhibitory effects on the neuron. This means they decrease the likelihood that the neuron will fire an action.
Explanation:
!!!!!How do radioactive elements help scientists establish how old rocks and fossils are?!!!!
Answer:
I will give a hypothesis. Just like a tree, when you cut a tree by its trunk, you will the rings. The rings around it represents the tree's age. So when you cut rock, the pores in the rock determine whether it is an old rock or a fossil rock.
Explanation:
The reason is, if it is limestone and it is an old rock, the pores will be slightly big and if the limestone is a fossil rock, then the pores will be bigger due to leaching or denaturing of the minerals in the rock through the ages.
Answer:
Radioactive elements all have a specific half-life, which is the time it takes for half of the radioactive elements in the fossil to disappear. In absolute dating, numbers are given to the ages of different fossils and rocks. To give an exact number or age range to a fossil, scientists use radiometric dating. This is where the half-lives of radioactive isotopes within the fossil or in the rock surrounding it are analyzed. Radioactive isotopes decay at a steady rate. By measuring the ratio of the radioactive isotope to the stable isotope it decays into, the number of completed half-lives can be estimated. Since you know the rate of decay, you can estimate dates with this ratio.
Explanation:
This is the process used to help scientists establish how old rocks and fossils are
A frameshift mutation can occur with either ______or______ muations.
Answer:
insertion or deletion
Compare and contrast natural selection and artificial selection. PLEASEEE THANKYOU!!!
Answer:
the favorable traits to be passed on to the next generation are chosen by the breeder.
Explanation:
i had this question before
How does a virus and viroid differ from each other?
Answer: The main difference between virus and viroids is that a virus is a small infectious agent, which can only replicate inside living cells whereas viroids are the smallest form of infectious agents, which only infect plants.
3.Which statement describes the major role of lipids within a cell?
Answer:
Lipids perform three primary biological functions within the body: they serve as structural components of cell membranes, function as energy storehouses, and function as important signaling molecules. The three main types of lipids are triacylglycerols (also called triglycerides), phospholipids, and sterols.
Explanation:
The statement that describes the major role of lipids within a cell is they are the main structural components of membranes. The correct option is D.
What are lipids?Lipids have three main biological activities in the body: they are essential signaling molecules, structural elements of cell membranes, and energy storage facilities.
Triacylglycerols (commonly known as triglycerides), phospholipids, and sterols are the three primary categories of lipids. Fats are subtypes of lipids that are typically composed of glycerol and fatty acid chains.
One sort of lipid, which includes fats, is a group of molecules that don't mix well with water. Hydrophobic, nonpolar, and primarily composed of hydrocarbon chains, lipids have a tendency to be.
Therefore, the correct option is D. They are the main structural components of membranes.
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The question is incomplete. Your most probably complete question is given below:
A. They cause DNA to replicate
B. They move RNA in the cytoplasm.
C. They catalyze chemical reactions in the cell cytoplasm.
D. They are the main structural components of membranes.
This is Andecite
it is formed
when lava flows
and solidifies...
Therefore it
is.....
Answer:
some hard rock or magma i forgot the rocks name but i just know its a very hard rock
Explanation:
I'll give you brain list if you help me.
Which layer in the blood vessel is composed of smooth muscle, allowing it to dilate or constrict?
Tunica intima
*Tunica media
Tunica externa
Endothelium
Answer:
b. Tunica media
Explanation:is correct
Answer:
B. Tunica media
Explanation:
the muscle cell’s contracting unit is known as the
Answer: The sarcomere is the functional unit of the muscle fiber. The sarcomere itself is bundled within the myofibril that runs the entire length of the muscle fiber and attaches to the sarcolemma at its end. As myofibrils contract, the entire muscle cell contracts.
Explanation:
Which ball-and-socket joint is the most freely moveable joint in the body?
Answer:
c. Glenohumeral joint
Explanation: is correct (the Shoulder joint)
What is meant by fitness? What is the relationship between animal behaviors and fitness?
Answer:
ehaviors that help animals or their young survive
Explanation:
increase the animals' fitness. Animals with higher fitness have a better chance of passing their genes on to the next generation. If genes control behaviors that increase fitness, the behaviors become more common in the species.
you bite into a fruit. it tastes bitter. it could be poisonous. you spit it out. what has happened in your nervous system to make you do this.?
Explanation:
The three nerves associated with taste are the facial nerve (cranial nerve VII), which provides fibers to the anterior two-thirds of the tongue; the glossopharyngeal nerve (cranial nerve IX), which provides fibers to the posterior third of the tongue; and the vagus nerve (cranial nerve X),
Please help!!!!!!!!!!!!!!
Answer:
15
Explanation:
the atomic number is the number above the symbol. the number below is the atomic mass.
Which of the following explains plantar flexion?
Answer:
a. Pointing your toes down towards the ground
Explanation: is correct
The active ingredient in which of the following drugs mimics a natural neurotransmitter?
Answer:
b. marijuana is correct
Explanation:
Why kharif crops cannot grow in rabi seasons?
Answer:
We know that kharif crops such as paddy need more water to grow healthy, which requires in rainy season. But in winter season , which does not requires so much, hence kharif crops cannot grow in this season healthy and properly. Therefore kharif crops cannot be grown in rabi season.
Which of the following structures help to cushion and guide articulating bones?
Answer:
b. Menisci
Explanation: is correct
What makes social animals unique?
Answer:
In these species, members of the group depend completely on one another. Different animals within the group have different jobs. Therefore, group members must work together for the good of all. Most species of ants and bees are highly social animals.
Explanation:
the transport a very large molecules such as proteins
Answer:
Very large molecules such as proteins are too big to move through the cell membrane which is said to be impermeable to them. The type of transport proteins present in a cell membrane determines which substances the membrane is permeable to. CO2 molecules pass directly through phospholipids. Glucose molecules travel through the proteins.
which organelle could be used to distinguish between a plant cell and an animal cell?
Answer:
Plant cells have a cell wall, chloroplasts, plasmodesmata, and plastids used for storage, and a large central vacuole, whereas animal cells do not.
Define: Heterogeneous Distribution, Modularity and Nestedness.
Explanation:
Nestedness is another computational approach that provides a description of groups of webs..
brainlist plz
Answer:
Heterogeneous Distribution, ModularityHeterogeneity in statistics means that your populations, samples or results are different. It is the opposite of homogeneity, which means that the population/data/results are the same. ... For example, if everyone in your group varied between 4'3″ and 7'6″ tall, they would be heterogeneous for height.Explanation:
please brainlies me if you carry please #carry on learningWhich law represents a balanced chemical equation?
Answer:
Law of the conservation of mass
Explanation:
Balancing equations demonstrates the fundamental law of the conservation of mass. It shows that you cannot create or destroy mass in a chemical reaction, so the mass stays constant.
how are neptune and mercury similar
state the name of structure that is present in bacteria cells and in plant cells but absent in animal cell
Answer:
cell walls
Explanation:
Cell walls
It provides the cell with both structural support and protection, and also acts as a filtering mechanism. Cell walls are absent in animals but are present in most other eukaryotes including algae, fungi and plants and in most prokaryotes (except mollicute bacteria).
how does a single genome code for so many types of tissues
Answer:
The genome of a cell contains in its DNA sequence the information to make many thousands of different protein and RNA molecules. A cell typically expresses only a fraction of its genes, and the different types of cells in multicellular organisms arise because different sets of genes are expressed.
The genome, which is the second layer, regulates gene access, allowing each cell type to activate its own unique genes while shutting off the majority of the others.
What is genome?The complete set of DNA instructions present in a cell is known as the genome. The human genome is made up of 23 pairs of chromosomes that are found in the cell's nucleus and one tiny chromosome that is found in the mitochondria.
Everything a person needs to grow and operate is encoded in their genome. The DNA sequence in a cell's genome contains the instructions needed to create tens of thousands of different protein and RNA molecules.
Thus, in multicellular organisms, distinct cell types develop because diverse sets of genes are expressed, even though a cell normally expresses just a portion of its genes.
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the process by which dna makes a copy of itself is called
Replication
.......................
HELP ME PLEASE I WILL GIVE BRAINLIEST
Answer:
The answer is C, from hydrosphere to atmosphere
Answer:
C
Explanation:
hope it helps
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How has the study of mitosis affected scientists’ knowledge of cancer? choose one
It led to a study of how to induce cancer cells to divide more rapidly.
It led to an understanding of how cancer cells divide so rapidly.
It led to the development of contact-inhibition regulators.
It led to the discovery of how to prevent cancer cells from dividing.
Explanation:
It led to the discovery of how to prevent cancer cells from dividing
Which of the following means needing more and more of a substance to achieve the same effects?
Answer:
Tolerance is correct
Explanation:
How would you expect the number of births to compare to the number of deaths in a population that was stable?
Answer:
in a stable population,the birth and death rates depend directly on the variance of age at death
