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e-lub [12.9K]
3 years ago
15

A scientist wishes to test a new antibiotic’s ability to treat stubborn bacterial infections. He tests his hypothesis that the a

ntibiotic works better than existing treatments by giving bacterial infections to mice and treating them with the antibiotic. He then determines how many of the mice recover from their infections. What is missing from his experimental design?
a. He is missing a control group of mice that did not receive the new antibiotic.
b. Nothing is missing—he has done everything he needs to do for this to be a successful experiment.
c. There are no variables in the experiment
d. He is missing an experimental group of mice that received a half dose of the new antibiotic.
Biology
1 answer:
marin [14]3 years ago
8 0

Answer:

a. He is missing a control group of mice that did not receive the new antibiotic.

Explanation:

In any experiment especially experiments testing effectiveness of a drug, there should be a control group.

The importance of a control group is to minimize the effects of other variables other than the independent variable hence increasing reliability of the results.

in this case, a group of mice that did not receive the new antibiotic would have served as the control group.

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Neurons have special proteins in their
Ilya [14]

Answer:

The ribosomes on the rough endoplasmic reticulum (RER) most likely produces neuronal special proteins.

Explanation:

Conduction of electrical impulses by action potentials of neurons takes place through controlled flow of charged ions through neuronal membranes. This ion transfer is controlled by specialized neuronal channel proteins which are present in the neuronal cell membrane.  

These channel proteins allow for hydrophillic passage of ions and water molecules across the neuronal membranes.  

Ribosomes that are attached to the RER are involved in protein synthesis. They carry the code for proteins carried by the mRNA and translate into respective protein.

The RER along with some free ribosomes cluster together as Nissl bodies and are mainly involved in neuronal specialized proteins.

4 0
3 years ago
The model proposed by John Dalton was helpful in advancing our understanding of the atom. What aspect of his model was actually
marin [14]
The answer in here is B. Dalton was incorrect saying that<span> atoms were the indivisible components of matter. Indeed that the atom could not be broken down. </span>
3 0
3 years ago
How do animals use phosphorus
frez [133]
Phosphorus: a vital source of animal nutrition. Phosphorus is one of the most important minerals in animal nutrition. It is the second most abundant element in an animal's body after calcium, with 80% of phosphorus found in the bones and teeth, with the remainder located in the body fluids and soft tissue.
8 0
3 years ago
What’s the answer????
Anna007 [38]
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5 0
3 years ago
Which best explains how muscle cells and skin cells are adapted for our environment? Question 2 options: 1 Muscle cells have mor
Keith_Richards [23]

The correct answer is option 4, that is, muscle cells require more energy, so they have more mitochondria in comparison to the skin cells.  

Mitochondria are the powerhouse of the cells. The synthesis of ATP takes place in them, that is, the energy currencies of the cell. The cells of the muscles need to work hard and thus require ample energy, for this, they need more concentration of mitochondria to generate a high energy yielding ATPs.  


5 0
4 years ago
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