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inysia [295]
3 years ago
13

A student placed a disk of filter paper in each of the following solutions: disinfectant 1, disinfectant 2, disinfectant 3, and

distilled water. While the four disks were soaking in their respective solutions, she streaked a sterile nutrient agar dish with a culture of E. coli bacteria. Then, she placed each disk carefully onto the nutrient agar dish, placed the lid on the dish, taped it shut, and incubated the dish at 37°C for several days. The diagram shows how the nutrient agar dish looked on Day 1 and Day 4. The shaded portion of the plate on day 4 indicates the bacterial growth. What is the control in the experiment?
a. Disk soaked in disinfectant 1
b. Disk soaked in disinfectant 3
c. Disk soaked in disinfectant 2
d. Disk soaked in distilled water
Biology
1 answer:
beks73 [17]3 years ago
8 0
<span>d. Disk soaked in distilled water

Experimentation is a scientific process wherein you test and verify a hypothesis based on its assumption is going to be supported or negated (null hypothesis). Hence experimentation involves the independent and dependent variable, also control variable as a level in the IV. </span>
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The students are studying for an exam in pharmacology. They know several local anesthetics have been covered along with other fo
quester [9]

Answer:

All of the above (marcaine, xylocaine, and novocain are local anesthetics)

Explanation:

Local anesthetics are medications that are administered to render a specific part of the body numb, and cause loss of sensation usually for a short period of time. The patient administered a local anesthetics, only feels numbness in the targeted part during the surgical procedure, and as such feels no pain or stress on the part of the body where such procedure is being performed.  

All of the above listed medications are examples of local anesthetics.

3 0
3 years ago
Select all the correct labels on the image.
valkas [14]

The diagram is not given in the question, so the diagram is attached below.

Answer:

chloroplast, thylakoid  space

Explanation:

The photosynthesis process is categorized in two steps light-dependent reactions and light-independent reactions.

In light-dependent reaction, chlorophyll absorbs one photon and loses one electron. This initiates the flow of electrons down an electron transport chain and result into reduction of NADP to NADPH.

Along with this, it creates a proton gradient or concentration across the chloroplast membrane and into the thylakoid  space. The proton concentration or energy gradient is then used by ATP synthase for the synthesis of ATP and cellular respiration.

Hence, the correct answer is chloroplast and thylakoid  space

8 0
3 years ago
Read 2 more answers
Thomas Malthus was an economist who influenced Darwin's developing theory of evolution. Malthus observed that the birthrate amon
sukhopar [10]

Answer:

The work of Thomas Malthus help and influence Darwin Thomas to refine his theory of natural selection by explaining that there is a meaningful competition between the individuals of a particular species or population for a specific resource such as food or shelter.

Thomas Malthus predicted that the human population is reproducing faster than its death race and will lead to growing faster than space and food supplies needed to sustain it. Darwin concluded further that If all offspring of almost any species survived for several generations, they would overrun the world and therefore a healthy and meaningful competition is present and to overcome this natural selection takes place as the individual adapt will ultimately survive.

4 0
2 years ago
Define reproduction plz
WINSTONCH [101]

Answer:

biological process by which new individual organisms are produced

7 0
2 years ago
Read 2 more answers
Why might a phylogeny based only on molecular data show a different pattern of relationships than a phylogeny of the same taxa b
Kitty [74]

A phylogeny of the same taxa based only on morphological traits:

Some highly conserved genetic sequences can result in unrelated species appearing closely related in a molecular phylogeny, and not reflect the same pattern as the morphologic phylogeny.

Gene sequence changes may not result in morphological changes.

Gene sequences always provide more data than morphological traits.

Morphological analyses always provide more data because each morphological trait is the result of the expression of many genes.

The molecular data may be based on the analysis of introns, which aren't expressed and don't contribute to the evolutionary history of a group of taxa.

Why is molecular data more accurate?

Phylogenetic trees reconstructed from molecular sequences are often considered more reliable than those reconstructed from morphological characters, in part because convergent evolution, which confounds phylogenetic reconstruction, is believed to be rarer for molecular sequences than for morphologies

Learn more about molecular data :

brainly.com/question/16044878

#SPJ4

6 0
1 year ago
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