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Mkey [24]
3 years ago
13

Choose a scientific theory and describe the theory.

Biology
1 answer:
faltersainse [42]3 years ago
4 0
I’m not 100% sure if this is a scientific theory but I’m going with the big bang theory. The big bang theory is a scientist best guess on how the world came to be. A 2013 map of the background radiation left over from the Big Bang, taken by the ESA's Planck spacecraft, captured the oldest light in the universe. This information helps astronomers determine the age of the universe.
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Design your own scenario related to Bacteria or Viruses. Identify the independent and dependent variables.
timurjin [86]

Answer:

An experiment where an antibiotic is tested against bacteria. The antibiotic can vary in its concentration for example, different amounts are applied to a sample of bacteria to see if it is affected by the action of the antibiotic and if so, in what concentration. So, the independent variable is the concentration of antibiotic while the dependent variable is the survival (or not) of the bacteria.

Explanation:

An independent variable is a variable that represents a quantity that the scientist modifies in an experiment. A dependent variable represents a quantity whose value depends on how the independent variable is modified. This is the variable being studied and measured.

So, an example of this applied to bacteria or viruses could be:

<u>An experiment where an antibiotic is tested against bacteria</u>. The antibiotic can vary in its concentration, different amounts are applied to a sample of bacteria to see if it is affected by the action of the antibiotic and if so, in what concentration. So, the independent variable is the concentration of antibiotic while the dependent variable is the survival (or not) of the bacteria.

To complete the experiment, an antibiotic whose effect is already known can be used as a positive control. That is, it is already known to kill the bacteria. And as a negative control you can simply use water, which has no effect and is known not to kill the bacteria. In this way, we validate the results and make sure that there is not something else that is affecting the bacteria and that only the antibiotic being studied has an influence.

5 0
2 years ago
Which of the following components of the immune system form memory cells after you receive a vaccine?
erik [133]
<span>B and T cells  ............</span>
5 0
3 years ago
Read 2 more answers
Which layer of the atmosphere contains most of the carbon dioxide and
Bess [88]

I'm not too sure but

D. Troposphere

7 0
3 years ago
Read 2 more answers
Place the following events in the proper order. 1) Activation of one or more cellular signaling proteins. 2) Dissociation of Ga
dolphi86 [110]

Answer:

4) Replacement of GDP by GTP on the Ga after interaction with an activated GPCR.

5) Conformational change in the Ga subunit causing a decreased affinity for the Gb g subunit.

2) Dissociation of Ga from the G protein complex.  

6) Ga-subunit with its attached GTP activates an effector like adenylyl cyclase.

3) Production of a second messenger, like cAMP.    

1) Activation of one or more cellular signaling proteins.

Explanation:

It is a signaling cascade initiated by G proteins. These G proteins function as molecular switches capable of activating signaling pathways in the presence of guanosine triphosphate (GTP), which is hydrolyzed in order to produce energy

6 0
3 years ago
Pls help i dont understand :(
yuradex [85]

Answer:

the bottom answer

Explanation:

carbohydrates are rapid energy.

6 0
3 years ago
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