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amm1812
4 years ago
11

Values of various substance throug testing

Biology
1 answer:
oksano4ka [1.4K]4 years ago
6 0

Answer:

  • The basic tool for determining toxicity of substances to marine and aquatic organisms is the toxicity test. In its simplest form, toxicity testing is taking healthy organisms from a container of clean water and placing into one containing the same water with a known concentration of a pollutant.

Explanation:

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A graduated cylinder containing 40 mL of water has a total mass of 60 g. A solid object carefully lowered into the graduated cyl
Dafna11 [192]

Answer:

The correct answer is -

A) 35 g

B)30 mL

C)1.66666666666667g/ml3

Explanation:

Given:

mass of graduated cylinder containing 40 mL = 60 g

volume of water = 40 ml

increase in the level of water = 70 ml

increase in mass = 95

Solution:

A) mass of object -

increased mass - initial mass

90 - 60 = 35 g

B) volume of object

increased volume - initial volume

70 - 40 = 30 mL

C)  density d=m/v

d=35/30

d=1.66666666666667

8 0
3 years ago
Which of the following best explains why the sequence of amino acids affects a protein's shape?
vova2212 [387]

I believe it is:

the bonding within a protein depends on the sequence of amino acids

Because proteins have multiple structures whether it is primary, secondary, tertiary, etc.,  and they vary based on the bonds such as dipeptide.

4 0
4 years ago
Read 2 more answers
If, and only blood sugar levels rise past a certain point, the cells will release a hormone called insulin. Insulin acts as a/an
lakkis [162]

Answer:

When blood glucose level rises beyond the threshold levels, the pancreas secrets hormones insulin. The latter ensures entry of  glucose into the cells through Glut transporters for cellular utilization, therefore reducing the blood levels., and promotes storage as glycogen in the liver and muscles.  

How ever if  the glucose levels drops below the  set point, an hormone glucagon is also produce by the pancreas to cause the liver o withdrawal and breakdown glucose storage as  glycogen back to glucose thus raising the blood glucose level back to the normal levels.

This is an example of negative feedback mechanism, because the increase in the input levels (blood glucose levels) brings about a counter  mechanisms (insulin secretions)as output , to reduce the  elevated   levels by promoting  entry into the cells,, thus bringing the levels to threshold levels.

Thus insulin is acting in a negative feedback mechanism to control blood glucose levels

Explanation:

6 0
3 years ago
The largest number in ecosystems
Bas_tet [7]

No more than five trophic levels are present in an ecosystem, most have only 4.

3 0
3 years ago
The effects of a deficiency of vitamin d are most readily observed in the _________.
BigorU [14]

Solution:

In children, it is easily found it can cause rickets. Rickets is a rare disease that causes the bones to become soft and bend.  In adults, severe vitamin D deficiency leads to osteomalacia. Osteomalacia causes weak bones, bone pain, and muscle weakness.

It happens due to the lack of Calcium.


4 0
3 years ago
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