A scientist conducts a test and finds out that the LD50 of a certain chemical is 20 mg per kilogram. Explain what this means.

2 answers:

7 0

LD means lethal dose. LD50 is the amount of a material, administered at once to cause the death of half (50%) of a group of test organisms. A test which shows that LD50 of a certain chemical is 20 mg per kg means that 20 milligrams of that chemical for every 1 kilogram body weight of the test animal when administered in one dose, causes the death of 50% of the test group.

rodikova [14]3 years ago

6 0

This means that 20mg/per kg (each kilogram of target animal) of the substance is enough dosage to kill 50% of the target sample population. LD50 means Lethal Dose 50. This term is critical in research in biology, medicine, and agriculture. Mostly the substances used are lethal such as radiation, toxins, or pathogen.

You might be interested in

what cellular mechanisms allow human body cells to maintain these concentrations ?

sweet [91]

Answer:

Active transport: movement against a gradient To move substances against a concentration or electrochemical gradient, a cell must use energy. Active transport mechanisms do just this, expending energy (often in the form of ATP) to maintain the proper concentrations of ions and molecules in living cells.

4 0

3 years ago

The critical evaluation of websites allows users to identify _______.

sattari [20]

The correct answer is D - The critical evaluation of websites allows users to identify websites containing false or misleading information. It's important to look at websites you are using carefully, so as not to be at risk of downloading viruses onto your computer, or finding false information.

5 0

3 years ago

What is natural selection?

Helen [10]

"Natural selection is the differential survival and reproduction of individuals due to differences in phenotype. It is a key mechanism of evolution, it is a change of heritable traits in a population over time"

8 0

3 years ago

Read 2 more answers

Ocean acidification impacts are: 1. 2. 3. 4.

____ [38]

Explanation:

In the 200-plus years since the industrial revolution began,concentration of carbon dioxide in the atmosphere has increased due to human actions.During this time,the pH of surface ocean waters has fallen by 0.1 pH units.This might not sound like much,but the pH scale is logarithmic,so this change represents approximately a 30 percent increase in acidility.

Pick as brainliest like my answer

that's the answer of my book 

hope it helps

#brainlyeveryday

#ctto

6 0

2 years ago

Which biome is an animal with thick fur best suited for

Semmy [17]

The arctic/polar biome
hope it helps

8 0

3 years ago

Read 2 more answers