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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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Give an example of an ecological phenomenon that could be studied by modeling
Over [174]

Answer:

Global warming.

Explanation:

Because it is an ecological problem that could be studied by modeling more easily than by observation or experimentation, because it occurs over a large area and a long period of time

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3 years ago
What best summarizes the differences between ancient and modern horses?
SashulF [63]
An ancient horse was used for labor and was made for carrying heavy loads of water horses are now built with more muscle in their legs
4 0
2 years ago
Alexis is out mowing the lawn and starts to feel dehydrated. Her ______ will secrete vasopressin. A patient suffering from sever
adoni [48]

1. The right answer is - Hypothalamus (manufactured by the hypothalamus, stored in the pituitary gland).

Vasopressin, or antidiuretic hormone, is a peptide hormone synthesized by the supraoptic and paraventricular nuclei of the hypothalamus, and released by the posterior pituitary gland (neurohypophysis).

It mainly has an anti-diuretic role in the kidney, where it causes a reabsorption of water via an action on the distal segment of the nephron during a dehydration body. Its gene is AVP located on human chromosome 20.


2. The right answer is - Increased Secretion of Vasopressin To Maintain Less Loss Of Water.

Vasopressin has an antidiuretic action: it decreases the volume of urine by increasing the water permeability of the collecting tube. It binds to the V2 receptor, which is coupled to a Gα protein, which activates a signaling cascade through the PKA. This causes the synthesis of aquaporin 2 (transmembrane pore) as well as its translocation to the apical / urinary membrane.

4 0
3 years ago
Describe the events that helped to shape the
Brums [2.3K]

Answer:

1707-1778- Carolus LinnaeusHedeveloped the two part naming system fororganisms, using the genus and species,known as scientific naming.1707-1788- Georges-Louis Leclerc,Comte de BuffonIn his writings, he notedthat different regions of the world havedistinct plants and animals, even when theyhave similar environments. This isconsidered to be the first principle ofbiogeography. Buffon also suggested thatspecies may have improved and degeneratedsince creation, and that the Earth is probablymuch older than the 6,000 years widelyaccepted at the time.1769-1832- Georges Cuvier- influencedby the writings of Buffon, Cuvier foundthat layers, or strata, in the Earth's rockeach represent a different period in theEarth's history.

Explanation:

thats all ik sorry

3 0
3 years ago
Halobacterium has a photosynthetic membrane that appears purple. its photosynthetic action spectrum is the inverse of the action
a_sh-v [17]

Yellow- Green Wavelength of light at peak absorption of 565nm.

Halobacterium is known to be a member of Archaea and they thrive in very salty environment such as Great Salt lake and Dead Sea. Halobacteria under the process of photosynthesis with chlorophyll and they make their ATP from the sunlight using bacteriorhodopsin and halorhodopsin as photosynthetic pigments.

However, photosensory pigements found in Halabacterium were:

1. photosystem 565 which is used to respond to yellow –green light in other for cell to find optimum conditions for ATP synthesis and photophosphorylation and they have peak absorbtion at 565nm.

2. Photosystem 370 nm appears to be responsible for the protective avoidance of blue/UV light.

6 0
3 years ago
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