Why is it important to post-rinse when pipetting volumes less than 20 microliters?.

Answers

Answer 1
Small Volumes may not get expelled completely due to surface tension

Related Questions

Tension is the major type of stress at transform plate boundaries

Answers

Tension is the major type of stress at divergent plate boundaries. When forces are parallel but moving in opposite directions, the stress is called shear. Shear stress is the most common stress at transform plate boundaries.

1. Sharks and marlin are fish, but dolphins are not. A. simple sentence B. compound sentence C. complex sentence

Answers

Answer:

Compound sentence

Explanation:

A compound sentence is made up of two independent clauses joined by a coordinating conjunction. In this case, it would be 'but'. Some other examples would be (for, and, nor, or, yet, or so)

Sharks and marlin are fish, but dolphins are not. The type of sentence is compound sentence. Thus option B is correct.

What are types of sentences ?

There are four different types of sentences such as Declarative/Statement Sentences helps in making statements and stating basic information, an opinion can be expressed by  using them and it is the most prevalent in most academic writings and verbal speech.

For Examples, Students failed to complete their essays on time, My wife loves eating cake in the morning.

Exclamatory/Exclamation Sentences used to express deep emotions or feelings, can be either disbelief or happiness and finished with an exclamation point.

For Examples, I got an A in my research paper! , That movie was exciting! Imperative/Command Sentences defines when we  giving demand or instruction, can either be negative or positive depending on a message.

For Examples, Do not stop!, Never speak to me like that again. Interrogative/Question Sentences is a type of simple sentence to understand as it helps in asking a question.

For Examples What time will you finish writing your English homework?

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Which theory holds that the pitch we hear is determined by the particular location on the cochlea where the hair cells vibrate the most?.

Answers

The Place theory holds that the pitch we hear is determined by the particular location on the cochlea where the hair cells vibrate the most. It is a hearing theory.

What is the place theory?

The place theory is a model indicating that sound perception depends on where component frequencies produce specific vibrations.

The place theory has into account the vibration in the basilar membrane of the cochlea.

This theory (place theory) can be considered the first step for the interpretation of pitch perception.

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Which is an example of a Gram-negative
bacteria?

Answers

Answer:

Gram-negative bacteria are bacteria that do not retain the crystal violet stain used in the Gram staining method of bacterial differentiation. They are characterized by their cell envelopes, which are composed of a thin peptidoglycan cell wall sandwiched between an inner cytoplasmic cell membrane and a bacterial outer membrane.

Explanation:

Hope this helps! :)

Answer:

E-Coli

Explanation:

<3

7. Individual parts of chromosomes
that determine your traits
Genetic crossword puzzle

Answers

The answer : Genes
Genes tell cells how to function and what traits to express

Harlequin shrimp _______. A. Control starfish populations b. Clean parasites from select fish species c. Control tubeworm populations d. Hide within coral using their special camouflage Please select the best answer from the choices provided A B C D.

Answers

Harlequin or Hymenocera picta is a shrimps species are found in the water of the Pacific and Indian oceans. They control starfish populations.

What is Harlequin shrimp?

They are also called Hymenocera picta scientifically and are majorly habitats to the coral of the Pacific and the Indian oceans. They belong to the phylum Arthropoda and are invertebrates.

They are two inches in length and specifically eats starfishes. Their feeding mechanism enables the population of the starfish to be balanced as starfishes are the primary food source for them.

They get nutrition and the essential energy from eating starfishes, they eat their prey in a particular fashion like first their tubes, soft tissues followed by central disk.

Therefore, option A. they control the starfish population is correct.

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Answer: A

Explanation:

Which of the following statements BEST identifies each cell type based on her data table?
A
Cell A is an animal cell because it has centrioles, which are specific to animal cells for mitosis; Cell B is the plant cell because it has a cell wall and chloroplasts, which are specific to plant cells for cell integrity and photosynthesis; and Cell C is the bacterial cell because it has no nucleus and circular DNA, which are specific to bacterial cells because they lack membrane bound organelles and require simpler cellular functioning.
B
Cell A is a plant cell because it has small vacuoles and centrioles, specific to plant cells for photosynthesis; Cell B is an animal cell because it has large vacuoles and chloroplasts, which are specific to animal cells for storage; and Cell C is a bacterial cell because it has circular DNA and a flagellum, which are specific to bacterial cells for simpler cellular functioning and cell movement, respectively.
C
Cell A is a plant cell because it has small vacuoles and centrioles, which are specific to plant cells for photosynthesis and mitosis; Cell B is a bacterial cell because it has large vacuoles and a cell wall, which are specific to bacterial cells for storage and protection; and Cell C is an animal cell because it has cell wall and flagellum, which are specific to animal cells for protection and movement throughout the body.
D
Cell A is a bacterial cell because it has centrioles and small vacuoles, which are specific to bacterial cells for binary fission and storage; Cell B is a plant cell because it has a cell wall and chloroplasts, which are specific to plant cells for cell integrity and photosynthesis; and Cell C is an animal cell because it has a cell wall and flagellum, which are specific to animal cells for protection and movement throughout the body.

Answers

Answer: answer A

Explanation:

All of the cells definitions are correct and that’s how we learned which one was different

When a substance crosses an epithelial barrier by moving through an epithelial cell, it is said to move via the ______..

Answers

Transcellular pathway

What is the name of a species that is highly connected to the entire food web and whose loss may result in ecosystem collapse

Answers

There are three types of keystone species cited by many scientists: predators, ecosystem engineers, and mutualists. Predators help control the populations of prey species, which in turn affects the quantity of plants and animals further along the food web.

How is a plateau different from a fault-block mountain?

Answers

Answer:

A plateau forms when a flat block of rock is uplifted, and a fault-block mountain does not

Answer:

How is a plateau different from a fault-block mountain? A plateau forms when a flat block of rock is uplifted, and a fault-block mountain does not. ... A scientist discovers a rock that she determines to be a fault.

Which nervous system produces the fight-or-flight reaction?

Answers

Answer:

sympathetic nervous system

Have a great day!

Answer:

Sympathetic nervous system

Explanation:

The autonomic nervous system has two components, the sympathetic nervous system and the parasympathetic nervous system. The sympathetic nervous system functions like a gas pedal in a car. It triggers the fight-or-flight response, providing the body with a burst of energy so that it can respond to perceived dangers.

`What do you mean by physiological functions for plants?

Answers

Answer:

Plant physiology deals with different plant structures and their functioning. It enables analyzing processes in plants, namely – photosynthesis, mineral nutrition, respiration, transportation, and ultimately plant development and growth which are traits displayed by living entities.

Explanation:

Hope this helps! :)

Which of the following statements is true regarding how DNA determines a trait such as eye color?

A. DNA interacts with proteins in the mitochondrion to control eye color.

B. DNA codes for mRNA, which then codes for proteins that ultimately determine eye color.

C. DNA directly produces pigments from the nucleus that travel to the retina.

D. DNA codes for rRNA, which creates a ribosome.

Answers

Answer:

B

Explanation:

Genes are the messages in our DNA that define individual characteristics. So the manifestation of the product that is coded by the DNA.

The golgi packages materials into ___ for transport or export.

Answers

Answer:

vesicles

Your welcome~

What is the difference between epidemic and endemic.

Answers

AN EPIDEMIC is a disease that affects a large number of people within a community, population, or region. A PANDEMIC is an epidemic that's spread over multiple countries or continents. ENDEMIC is something that belongs to a particular people or country.

Answer:

Epidemic: a widespread occurrence of an infectious disease in a community at a particular time.

Endemic: (of a disease or condition) regularly found among particular people or in a certain area.

Explanation:

______ is a direct result of natural selection ?

A. Increased variation

B. More offspring

C.Adaptation

D. Increased strength

Answers

C. adaptation is a direct result of natural selection
C is the answer, have a good day

Which statement is correct regarding metamorphic rock formation?

Multiple choice question.
cross out

A)
The temperature inside Earth is cooler which allows metamorphic rocks to form more quickly.

cross out

B)
Small pieces of rocks are buried, squeezed, and cemented together.

cross out

C)
Weathering and erosion cause rocks to break down to form metamorphic rocks.

cross out

D)
The deeper into Earth’s crust, the higher the pressure that forms metamorphic rocks.

Answers

Answer:

D is the answer.

Explanation:

The deeper into Earth's crust, the higher the pressure that forms metamorphic rocks.

how do eukaryotic cells overcome the problems of finishing replication of dna in the gap left by the rna primer

Answers

Eukaryotic cells overcome the problems of finishing DNA replication by ligase enzymes that help to fill the gaps. They are fundamental enzymes during DNA replication.

Ligases and DNA replication

DNA replication is the process by which a molecule of DNA is duplicated in the S phase of the cell cycle.

The termination of this process (DNA replication) happens at the moment that replication forks meet on the same DNA stretch.

Ligases are fundamental enzymes that help to fill the remaining nucleotide gaps generated during DNA replication.

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In the past, diabetics used horse or cow insulin
to control their glucose levels. Today, as a result
of genetic engineering, human insulin can be
synthesized by bacteria. State one advantage
for a person with diabetes to receive genetically
engineered insulin rather than insulin taken
from a horse or cow. [1]

Answers

Answer:

Genetically engineered insulin is actually human insulin and is less likely to be rejected by the person.

Explanation: Hope this helps

One advantage for a person with diabetes to receive genetically engineered insulin rather than insulin taken from a horse or cow is that human insulin produced by bacteria is less likely to cause an allergic reaction.

Why animal based insulin bad?

When animal insulin was used, some people with diabetes developed an allergic response to the foreign protein, causing discomfort and making the treatment less effective. Genetically engineered human insulin produced by bacteria is identical to the insulin produced by the human body, reducing the likelihood of an allergic reaction and making the treatment more effective.

Additionally, genetically engineered insulin can be produced in larger quantities, at a lower cost, and with greater consistency than animal-derived insulin.

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Octopuses, mammals, and some jellyfish have eyes that contain a lens for focusing light. Eyes with a lens were not present in the common ancestor of these animals. Is an eye with a lens a synapomorphy or a homoplasy?

Answers

Answer:

Synapomorphy !!

Explanation:

An Eye with an lens is specified as a Synapomorphy .

brainly Carolus Linnaeus developed a classification system very close to the one that we use today. In particular, we still follow the protocol of giving each unique species a name using binomial nomenclature, a two-word naming system. Which statements describe the major importance of our current classification system

Answers

The major importance of our current system of classification is that it helps to correctly identify living organisms.

This is because the classification system gives us information concerning the characteristics of each organism.

What is binomial system of nomenclature?

This is the system used in naming living organisms. Every living thing is given two different names:

The generic name

The specific name

The generic name is the name of the genus the organisms belongs to while the specific name is the name of the species to which it belongs.

These two names together ( genus and species names ) are collectively known as the scientific name

For instance:

The scientific name for :

Grasshopper is Valanga nugriconis

Valanga is the genus which grasshopper belongs to and nigriconis is the name of its species

Pineapple is Ananas comosus

Orange is Citrus sinensis

What is classification of living organisms?

This is the process of grouping living organisms together based on some unique characteristics

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Details in this passage most support the idea that



A. Technology has greatly improved our lives.
B. Parent's need to limit teenager's access to technology.
C. All types of technology are health hazards.
D. Technology can have negative effects if used poorly.

Answers

Answer:

D. Technology can have negative effects if used poorly

Can someone help me with biology?

Answers

Answer:

Me, check my profile I answered biology questions. byw still middle scl but trying to help

What situation can cause positive population growth?

Answers

Answer: immigration rate exceeds emigration rates.

Explanation: immigration means that people are moving into another place, and emigration means that people are leaving a place, usually a  country.

hope this was helpful!

The birth rate (b) and the mortality rate (c) are the two key elements that influence population increase (d).

Which of the following best defines sustainable fishing practices? a. Harvesting practices that maximize yields and profits. B. Harvesting practices that maximize the yield per fisherman. C. Harvesting practices that do not reduce the potential for future harvests. D. Harvesting practices that reduce the potential for future harvests. Please select the best answer from the choices provided A B C D.

Answers

Answer:

a. harvesting practice that maximize the yield per fisherman

Explanation:

hope it helps

Answer: its B

Explanation: Harvesting practices that maximize the yield per fisherman.

He is right but its B not A

PLSSS HELPPP i don’t get how to do this!!!!

Answers

Explanation:

it should be around -11.5. you read the scale at the upper meniscus, and the readings are as follows:

from down to up:

-15, -14, -13, -12, -11, -10.

ASAP Not all genes come in pairs! Your blood type is determined by how many different alleles?

Answers

Two alleles determine your blood type, one which comes from mother and another from father.

Answer:

I think it is determined by the DNA and RNA found in couple's body. i.e due to interplay of chromosomes.

Why would it be more likely for Long Island Sound to freeze, than the ocean off Rhode Island?​

Answers

The water is part freshwater, instead of entirely ocean water, which makes it freeze at a higher temperature because salt makes the water more resistant to freezing.

Blood must be maintained at a fairly constant pH between 7.35 - 7.45. One of the principal buffers responsible for doing this consists of carbonic acid in equilibrium with bicarbonate ions. If you breathe too deeply or rapidly, a condition known as hyperventilation may occur in which some muscles are temporarily paralyzed because the pH of the blood becomes too high.

Explain why the pH changes in this way and why the condition can be corrected by breathing in a paper bag.

Answers

Answer:

The most important way that the pH of the blood is kept relatively constant is by buffers dissolved in the blood. Other organs help enhance the homeostatic function of the buffers. The kidneys help remove excess chemicals from the blood, as discussed in the Kidney Dialysis tutorial.

Explanation:

hope it helps you

According to the operon model, for the synthesis of an inducible enzyme to occur, the:.

Answers

The operon model explains the regulatory system of the gene expressions in the bacteria. An inducible enzyme will be synthesized if the substrate binds to the repressor. Thus, option B is correct.

What is the operon model?

An operon model is the representation of the genes that are closely related and is the regulation of the genetic mechanism in the bacteria. They consist of the structural gene, an operator, and a promoter.

The inducible enzyme in the operon model is produced if the substrate binds to the repressor. The substrate act like an inducer to promote the transcriptional process by inhibiting the activity of the repressor.

The inhibited repressor will not be able to bind the operator and hence RNA polymerase will be free to move and complete the process of transcription in bacteria and viruses.

Therefore, the substrate binds to the repressor so that an inducible enzyme is produced.

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