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oksian1 [2.3K]
3 years ago
7

How do scientists determine the toxicity of a chemical

Biology
2 answers:
DedPeter [7]3 years ago
7 0
By the effect it has on a living thing
aleksandr82 [10.1K]3 years ago
6 0

Answer:

Toxicity can be measured by the effect the substance has on an organism, a tissue or a cell. We know that individuals will respond differently to the same dose of a substance because of a number of factors including their gender, age and body weight. Therefore a population-level measure of toxicity is often used

Explanation:

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Why can't prokaryotic species be defined as a group of similar organisms that could sexually reproduce together?
s344n2d4d5 [400]

Answer:

The prokaryote divides by asexual mode of reproduction.

Explanation:

The concept of species which defines a species as a group of individuals of a population which can interbred and produce a fertile progeny is applicable to the organism which can reproduce sexually.

Since the bacteria divide through asexual means and not through sexual ways therefore the concept of defining a species becomes complicated and does not apply.However the concept of species in prokaryotes is still a topic of research.  

Thus, the biological concept of species is not applicable to prokaryotes.

6 0
3 years ago
Biogenous sediment is made up of ____.
Lapatulllka [165]
Calcium carbonate or silica

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When moving around the horse you should?
Roman55 [17]
Always be touching the horse so if you go behind the horse it won't be startled and try to kick. Also you need to be talking to it for the same reason
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3 years ago
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Question 12 (5 points)<br> Which region contains the halogen family of elements
HACTEHA [7]

Answer:

The answer is C.

Explanation:

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3 years ago
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After nervous stimulation stops, calcium ions returning to the sarcoplasmic reticulum prevent ACh in the synaptic cleft from con
zhuklara [117]

Answer:

False.

Explanation:  

Neurotransmitter release occurs from the nervous terminal or varicosities in the neuronal axon. When an action potential reaches the nervous terminal, the neurotransmitter is released by exocytose. The molecule binds to its receptor in the postsynaptic neuron, triggering an answer. As long as the signal molecule is in the synaptic space, it keeps linking to its receptor and causing a postsynaptic response. To stop this process the neurotransmitter must be taken out from the synaptic space. There are two mechanisms by which the neurotransmitter can be eliminated:

• Enzymatic degradation/deactivation: There are specific enzymes in the synaptic space, which are in charge of inactivating the neurotransmitter by breaking or degrading it. The enzyme acetylcholinesterase prevents ACh from continuing to stimulate contraction.

• Reuptake: Receptors located in the presynaptic membrane can capture de molecule to store it back in new vesicles for posterior use. These transporters are active transport proteins that easily recognize the neurotransmitter.  

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3 years ago
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