Arrange the events of synaptic transmission in correct sequence
(1) sodium ions diffuse into the cell and cause a local potential
(2) neurotransmitter binds with receptor on postsynaptic cell
(3) neurotransmitter diffuses across the synaptic cleft
(4) membrane permeability to sodium ions on postsynaptic cell increases
(5) action potential causes release of neurotransmitter
Answer:
5,3,2,4,1
Explanation:
The firing of an action potential at pre-synaptic neuron makes its axon terminal to release the neurotransmitters in the synaptic cleft. The released neurotransmitter molecules then bind to their receptors present at the surface of the dendrites of the postsynaptic neuron. This binding opens ion channels and allows the specific ions to enter into the postsynaptic neuron. The opening of Na+ channels allows these ions to enter into the neuron and changes the membrane potential. This changed membrane potential is called local potential and is a depolarizing graded potential.
The most abundant food source for a species of lizard that eats a variety of anthropods is warm, or wood habitats.
In order to keep their body temperature stable, lizards bask in the hot sun before moving to cool cover and burrows. Because lizards are only active when their bodies are at their ideal, warm temperature, the desert's warm, sunny climate is great for them. Thus, they prefer a habitat that can be provided a suitable environment to them with a good supply of food sources like arthropods or insects.
Since they are natively insectivorous, common house lizards enjoy eating insects. They regularly consume spiders, snails, caterpillars, and various insects. Lizards are considered to be reptiles. They have the ability to split apart and develop new tails. They can independently move their eyes because they can see in two directions at once. Even if they bite, they are safe.
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Complete question
- It has to be E. coli because it is positive for gapA
- It can't be Salmonella, because it is negative for the invA marker but still makes people sick
- It has to be used because it is positive for the apeE marker
Answer:
<u>1. It can't be Salmonella, because it is negative for the invA marker but still makes people sick </u>
- A combination of positive results from the multiplex PCR inva, apee and gapa is used to definitively identify Salmonella.
- Pathogenic, or disease causing Salmonella is definitely not present, as inva is required for it to be pathogenic. The test did not detect the inva sequence, thus it is truly negative for this particular pathogen.
<u>2. It has to be E. coli because it is positive for gapA </u>
- E. coli may be present, as gapa was detected- a presumptive positive. However, this may need to be definitively determined through further methods of sample analysis, such as 2D-gel electrophoresis.
- apee may belong to another type of bacteria present within the initial sample, or there may be sample contamination
Explanation:
Polymerase chain reactions, PCRs are a form of nucleic acid amplification testing NAAT that exploit the mechanism of transcription by using a thermostable DNA polymerase. These require a sample of genetic material such as RNA or DNA; specific regions of the gene sequence are targeted for replication by primers. In the presence of these specific gene sequences, the primers make billions of copies of the sequences.
However, if these gene sequences are absent, the primers are not capable of identifying and amplifying the sequence. This reaction is highly specific. Positives obtained have a high chance of being true positives and negatives have a high chance of being true negatives
.
Pathogens or infectious agents that are capable of causing disease i.e. making people sick. Both E. coli and Salmonella are genuses of enteric bacteria capable of causing disease via fecal contamination. Common symptoms include
- abdominal cramps
- vomiting
- fever
- diarrhea
This test would include primers for the detection of each sequence: gapa, apee, inva. Salmonella's inva was not detected, thus it is not present.
Further steps may include a 2 D gel electrophoresis- here an electrical current is utilized to separate bands of DNA within the sample. This should correspond with an expected DNA size in base pairs or bp for E.coli- this should be determined by running the sample in the gel with a positive control, containing genetic material for E coli, and a negative control, of purified water to determine contamination.
Answer:
current, rainfall, explosion
Answer:
<h2>Option - C</h2>
<h3>Hope it helps you </h3>