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Sergio039 [100]
3 years ago
8

The presence of which structure helps classify an organism as eukaryotic?

Biology
2 answers:
Alex777 [14]3 years ago
8 0
Eukaryotic cells have a nucleus and contains organelles.
lesya692 [45]3 years ago
8 0

Answer: Nucleus

Explanation:

The presence of Nucleus in the eukaryotic cell shows that the cell is an eukaryotic cell. The Nucleus is the genetic material found in all the eukaryotic cell which helps in the transfer of the genetic information from one generation to another.

This is a characteristic feature of eukaryotes. It is not found in the prokaryotes. They lack nucleus and their genetic material is dissolved in the cytoplasm.

Hence, the correct answer is Nucleus.

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Please Help Match The following Terms!!!
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Explanation:

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2 years ago
Which of the following is not true of norepinephrine?A. It acts in both the central nervous system and the autonomic nervous sys
Jet001 [13]

Answer: D. NE producing cell bodies are found in widespread brain regions

Explanation:

Norepinephrine (NE) is a chemical in the body that exists naturally and acts as both a neurotransmitter and a stress hormone. When the brain perceives that there has been a traumatic occurrence, it is released into the blood as a stress hormone.

Norepinephrine is produced in the inner part of the adrenal glands which also produces  adrenaline.

Hence, NE is only found in  inner part of the adrenal glands and the correct option is D.

8 0
3 years ago
List the four major hypotheses mendel developed using his garden pea experiments.
Andreas93 [3]
I believe the hypothesis developed by Mendel as a result of his experiments with the garden pea include;
1. For each inherited trait, an individual has two copies of genes-one fromeach parent.
2. There are alternative versions of genes. Today the different versions of a gene are called its  alleles
3. When two different alleles occur together, one of them may be completely expressed, while the other may have no observable effect on the organisms appearance. Mendel described the expressed form of trait as dominant. The trait that was not expressed when the dominant form of the trait was present was described as recessive.
4. When gametes are formed, the alleles for each gene in an individual separate independently of one another. Thus, gametes carry only one allele for each inherited trait. When gametes unite during fertilization, each gamete contributes one allele.
5 0
3 years ago
The lab you work in has discovered a previously unidentified extracellular signal molecule called QGF, a 75,000-dalton protein.
zmey [24]

Answer:

A- It is because said molecule presents binding to different receptors and in the case of glia cells it does not present an answer because they do not have a specific receptor for said molecule.

b-in the case of muscle, this molecule could bind to calcium channels or to the REL itself, generating the opening of said channels or the release of calcium found in REL. In this way, by increasing the intracellular concentration of calcium, it activates the actin head, causing the topoisomerase to move and promoting binding with myosin. Once the activated actin will perform a "rowing" movement to generate the drag of the myosin and the union of the Z lines.

c-In the process of neuronal apoptosis, the cell itself generates biochemical signals (either by positive induction in which the receptors and receptors of the membrane bind to certain substances, or by negative or mitochondrial induction in which the ability to suppress certain substances is lost. substances that would generate the activity of apoptotic enzymes) that cause them to condense and alter the cytoplasm, the cell membrane, the cell nucleus to collapse and DNA to fragment. Finally, the microglial cells end up phagocytizing and eliminating the remains of the dead neurons, so that they do not generate interference for the normative functioning of the brain.

d- This molecule could fulfill a path similar or similar to that of growth factors, that is how they are associated with heparan sulfate of the extracellular matrix, which serves as a warehouse for inactive factors. FCFs contribute to different types of responses, such as wound healing, hematopoiesis, angiogenesis, or embryonic development

Explanation:

Regarding the explanation, it is important to keep in mind that this molecule can play a role both in the nervous system and in other organs, that is why in case it is sought that it does not have this apoptotic effect on neurons, some coarse, macro compound that allows the blood-brain barrier to not allow passage.

8 0
3 years ago
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