Answer:
Objective lens
Explanation:
The reactivity of alkali metals increases down the group. Periodic trends help scientists to predict the reactivity of newly discovered elements.
In group 1, reactivity of elements increases down the group because as you go down the group more shells are added thereby making it easier to remove the outermost electron.
This explains the increase in chemical reactivity from Lithium to cesium.
These periodic trends are very important in predicting the chemical reactivity of newly discovered elements that are added to a group.
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Answer:
The reactivity greatens the farther you go down on the periodic table. Lithium will have the weakest reaction, and cesium will have the greatest reaction. Patterns like this are useful to scientists because it shows which elements are the most reactive and which aren't. The farther down and to the left you go within the periodic table, the more reactive the elements become. The farther up and to the right you go, the less reactive they become.
Explanation:
Answer:
Plant cells are eukaryotic cells present in green plants, photosynthetic eukaryotes of the kingdom Plantae. Their distinctive features include primary cell walls containing cellulose, hemicelluloses and pectin, the presence of plastids with the capability to perform photosynthesis and store starch, a large vacuole that regulates turgor pressure, the absence of flagella or centrioles, except in the gametes, and a unique method of cell division involving the formation of a cell plate or phragmoplast that separates the new daughter cells.
Explanation:
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Answer:
Animal cells do not have a cell wall or chloroplasts but plant cells do. Animal cells are mostly round and irregular in shape while plant cells have fixed, rectangular shapes.
Answer:
Using microscopy methods such as fluorescence microscopy and polymerase chain reaction (PCR).
Explanation:
A bacterium that is viable but non-culturable refers to those bacteria that are in a very low metabolic state (dormant state) that don’t grow but is alive. Methods based on culture will not be able to detect a viable but non-culturable bacteria, because these bacteria will not grow and in few cases if the bacterium could be cultured, it only grows in very specific conditions. The most common methods used to check for the presence of bacteria that are viable but non-culturable is the fluorescence microscopy. The disadvantage of this technology is that don’t discriminate between live and dead cells, it only detects its presence. Another common technology is a polymerase chain reaction (PCR), that detects DNA, but this technique also doesn’t discriminate between living or dead cells. But usually is combined with stains to detect a damaged of the membrane, this damage refers to nonviable bacteria.
Answer question in photo please
Answer:
B
Explanation:
The rocks' forms and edges are smooth and appear to have been rounded. This is a hallmark of abrasion because the rocks lose their sharp edges and round out as a result of the constant rubbing and scraping action of wind-borne particles against them.
A. 4
B. 2
C. 3
D. 1
An experimental pharmaceutical is typically approved after it passes 4 phase of clinical trials.
What is clinical trial ?
Clinical trials are combination of new research, studies and experiments performed in people to evaluate the effectiveness of new experiment on human health.
It consists of main 4 phases.
Phase 4 clinical trial is also known as " Post-Approval Research and Monitoring ". It is the final stage of trial for any pharmaceutical product, drug or device. This trial study about the side effects, real life scenarios, long-term risks and benefits of particular pharmaceutical product which were not seen in the early trials.
So we can sayan experimental pharmaceutical can be approved when it passes 4 phases of clinical trials.
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