A virologist has a cell-free extract of herpes simplex virus (HSV) that has a titer of 6 x 106 infectious virus particles/mL. This virus forms plaques on monolayers of the monkey kidney cell line, CV-1. Following completion of a 10-fold dilution series, the virologist plates 100 microliters of each sample in duplicate.
Required:
What experimental results did he MOST LIKELY observe in the duplicate plates corresponding to his 1:10000 dilution?
Answer:
61 for Plate 1 ,
59 for Plate 2
Explanation:
Given that the original stock has a concentration of 6 * 10^6 infectious virus particles /mL
and it was diluted by 1:10000
New concentration = ( 6 * 10^6 ) / 10000 = 600 infectious virus particles/ mL
Also given that the virologist plates 100 mL of each sample
therefore; 0.1 mL has a count of 60.
The experimental results that he is most likely to observe in the duplicate plates will be ;
61 for (Plate 1) ,
59 for (Plate 2)
please answer asap! thanks :-)
Why won’t the antibodies for the common flu virus work against the avian flu?
[ give like 1-2 sentences for this one you don't need to specify that much (unless you want to) ]
Rearrange them in the correct sequence.
Harvesting, Sowing, Manuring, Tilling and Ploughing, Irrigation, Weeding.
Plzz Help ASAP
plz ASAPPP
cuál es el límite entre la cavidad torácica y abdominal?
Answer:
El diafragma es un músculo en forma de cúpula que separa la cavidad torácica (pulmones y corazón) de la cavidad abdominal (intestinos, estómago, hígado, etc.).
Explanation:
Determine whether each of the following are characteristic of open-mindedness, skepticism, or both.
an important part of science
the interest in new or different ideas
open-mindedness
skepticism
both
if not checked, it can prevent progress
leads to critical evaluation of ideas
if not checked, it can lead to ideas being accepted without significant evidence
to support them
DONE
1 Intro
Answer:both,open-mindedness,skepticism,skepticism,open-mindedness
Explanation:
Urology nurses must pass the
ABU.
OWOCNCB.
O CCCN.
O NCLEX.
Answer:
Abu
Explanation:
In meteorology, ____ is a volume of air defined by its temperature and water vapor content.
Answer:
mass
Explanation:
An Air mass is a volume of air defined by its temperature and water vapor content. A front is the border between two air masses.
In meteorology, mass is a volume of air defined by its temperature and water vapor content.
What is meteorology?In the academic, public, and private sectors (government and business), meteorologists work in these fields. Some of the businesses and organizations who employ meteorologists or make use of various meteorological services.
Although we will touch on a few other topics as well, the main focus of this course will be on weather analysis and forecasting. After all, everyone is affected by the weather every single day in some way.
Meteorology is defined as "the science of the atmosphere covering both weather and climate" in the Met Office's Meteorological Glossary.
Therefore, In meteorology, mass is a volume of air defined by its temperature and water vapor content.
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A graph here shows the average frequency of beak depth for a species of
birds in an area. There is a higher frequency of intermediate beak depths,
with some variation within the population for beak size. A homeowner
removes the native landscaping that contained trees and shrubs that
formed fruits and nuts. The homeowner plants new trees that produce only
larger sized nuts. No more smaller berries or intermediate fruit food
sources are available. What is the most likely impact of the change in the
food supply within the homeowner's vicinity? Select ALL that apply.*
Natural Selection
2
Fitness in Present Environment
3
Beak Depth
There will be a decrease in frequency for beak sizes labeled at point 2 on the graph.
Natural selection will likely favor an increase in frequency for beak sizes at point 3 on
the graph.
Individual birds will migrate to the area, increasing the frequency of beak sizes at
point 1 on the graph.
The population of birds will change over time with regard to its beak frequency due to
directional selection.
The population of birds will change over time with regard to its beak frequency due to
stabilizing selection
Answer: A,B,D
Explanation: trust i just did it on USA test prep:)
Natural selection will likely favor an increase in frequency for beak sizes at point 3 on the graph.
There will be a decrease in frequency for beak sizes labeled at point 2 on the graph.
The population of birds will change over time with regard to its beak frequency due to directional selection.
What is natural selection?
Natural selection is a mechanism of evolution that occurs when individuals with certain advantageous traits are more likely to survive and reproduce, passing those traits on to their offspring. This process leads to a gradual change in the genetic makeup of a population over time, as beneficial traits become more common and less advantageous traits become less common.
Natural selection occurs because resources in nature are limited, leading to competition for survival and reproduction. The individuals with traits that best suit them to their environment will have a higher chance of success, while those with less suitable traits are more likely to die or fail to reproduce. Natural selection is a key driver of evolution and is responsible for the diversity of life on Earth.
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From fossil evidence, you know two species shared a common ancestor approximately 50 million years ago. In comparing a known neutral sequence between rats and mouse, you found 92 base differences in 1000bp. From this information, which of the following values is closest to what you would predict the mutation rate to be?
a. 1 x 10-9
b. 4 x 10-9
c. 2 x 10-9
d. 5 x 10-9
e. 5 x 10-8
f. 8 x 10-9
Answer:
Option c ([tex]2\times 10^{-9}[/tex]) is the correct alternative.
Explanation:
Given:
Common ancestor,
= 50 million years ago
Base differences,
= 92
Now,
The predicted mutation rate will be:
= [tex]\frac{92}{50\times 10^6\times 1000}[/tex]
= [tex]\frac{1.84}{10^9}[/tex]
= [tex]1.84\times 10^{-9}[/tex]
or,
= [tex]2\times 10^{-9}[/tex]
Thus the above solution is the right one.
The increase in fossil fuel burning since mid-19th century is increasing the amount of CO2 in the atmosphere true or false
Answer:
true
Explanation:
this is a true statement.
Jane Goodall did some things that would probably not be done today in a scientific study. What were some things?
A. She gave the chimps names
B. She allowed them to get used to her presence
C. She gave them some food
D. All of the above
Answer:
Answer is D, all of the above
Difference between pure tone and speech audiometer
Answer:
Speech audiometry assesses your ability to hear and comprehend spoken words. ... They are also charted on an audiogram, which measures the decibel level, frequency and gravity of hearing loss.
Pure-tone audiometry only measures audibility thresholds, rather than other aspects of hearing such as sound localization and speech recognition. ... However, there are benefits to using pure-tone audiometry over other forms of hearing test, such as click auditory brainstem response pure tone audiometry, which only gives an indication of absolute perceptual thresholds of tonal sounds (peripheral function), whereas speech audiometry determines speech intelligibility and discrimination
Explanation:
~Hope this helps ~Which two stages are part of the cell cycle but not part of mitosis?
Answer:
Interphase is one of the two
Explanation:
Interphase is often included in discussions of mitosis, but interphase is technically not part of mitosis
The mitotic phase and inter phase are the two primary stages of the cell cycle. The cell develops and DNA replication occurs during interphase. The duplicated DNA and cytoplasmic components are segregated and the cell splits during the mitotic phase.
What are the different phases of the cell cycle?The four stages of mitosis are prophase (sometimes known as early prophase and prometaphase), metaphase, anaphase, and telophase. The mitosis movie contains more information about these phases. In cytokinesis, the cell's cytoplasm splits in two to create two new cells.A cell cycle is the sequence of events that occur in a cell as it grows and divides. A cell spends the majority of its time in what is known as interphase, where it grows, replicates its chromosomes, and prepares for cell division. The cell then exits interphase, goes through mitosis, and divides completely. Prophase, prometaphase, metaphase, anaphase, and telophase are the stages. Cytokinesis is the final physical cell division that occurs after telophase and is thus sometimes considered a sixth mitotic phase.To learn more about phase of cell refer to:
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How can cells store the sugar that is produced in photosynthesis?
Answer:
it is stored as starch
Explanation:
Answer: It is stored as starch.
Explanation: that's what I would say. hope this helps and I hope you have a super fantastic day:)
B. How do the roots of the trees may help in controlling soil erosion?
a.They keep the soil more intact
b. They go deep down the ground.
c. They absorb nutrients from the soil
d. All of the above
I believe the answer is d, all of the above ^^
Which of the following statements about aquatic ecosystems IS correct?
Rivers and streams are flowing salt water ecosystems
Marine ecosystems are standing freshwater ecosystems
Ponds and lakes are flowing-water ecosystems
Estuaries are made of both fresh and salt water, where rivers meet the sea.
A solution in which the concentration of solutes is the same inside and outside of a cell is a _______________________ solution: *
hypertonic
hypotonic
isotonic
None of the above
Which codon is the code for the amino acid serine (Ser)? please help
Which is an example of heterozygous genotype?
[A] AA
[B] Aa
[C] aa
Answer:
[B] Aa
Explanation:
Heterozygous genotype means "having two different alleles of a particular gene or genes." That would mean that the letters are different, so Aa.
Answer:
b because one is dominate and other is a hybrid
Explanation:
5) Select True or False. If False, select the statement that makes it True. A piece of plastic is not a mineral because it is made in a factory and is not found naturally in the Earth. True False; A piece of plastic is a mineral because it is inorganic. False; A piece of plastic is a mineral because it is made in a factory and is not found naturally in the Earth False; A piece of plastic is a mineral because it is a mixture.
Answer:
True
Explanation:
The answer is true because Plastic is not a mineral. It is a solid and it has a definite chemical composition. Plastic is made from oil (an organic material) and it is made by humans - plastic is not a naturally occurring substance.
Answer:
True
Explanation:
which organ is responsible for helping to keep the water concentration equal on each side of the cell membrane?
(please help I've been stuck on this for 2 days)
Answer:
solute membrane
Explanation:
Kidney is the main organ which is responsible for helping to keep the water concentration equal on each side of the cell membrane.
What is Kidney?The kidneys are the main organs in the body which remove waste products and extra water from the blood in the form of urine and also help to keep the chemicals such as sodium, potassium, and calcium balanced in the body. The kidneys also secrete hormones which help control blood pressure and stimulate bone marrow to make red blood cells.
Kidneys maintain water concentration in the body. Kidneys maintain homeostasis through osmosis. Osmosis is the phenomenon of movement of water or fluid particles from a region of higher concentration to a region of lower concentration through a semi-permeable membrane.
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HELP ASAP PLEASE
A natural resource is best defined as any naturally occurring material that is which of the following?
A. Used by people
B. Mined from Earth
C. Unlimited in quantity
D. Left untouched in nature
Answer:
The correct answer is B
Explanation:
A natural resource will always come from nature and it can be used for economic gain.
Yes, they can be used by people, but so can other resources, so the answer is not A.
Not all natural resources are unlimited, such as coal, are unlimited in quantity, so the answer is not C
Lastly, we do not leave natural resources untouched; we use them, so the answer is not D.
Please give me brainliest if I helped!
Which model shows a way that large molecules can enter a cell without using
the cell's energy?
Answer:
C
Explanation:
There was no C and D on yours but here is a picture of my son's exam.
A person who is interested in learning more about the fight or flight response may pursue a career in?
Answer:
A person who is interested in learning more about the "fight or flight" response may pursue a career in endocrinology
Explanation:
:)
Fossil fuels are formed when organic material is subjected to extreme temperatures and pressure over many years. Where are does the
energy trapped within fossil fuels ultimately come from?
A)geothermal energy trapped within Earth
B)
the Sun's energy trapped in the organisms
C)
heat energy generated due to high pressure
D)
energy released by decomposition reactions
PLEASE HELP! CORRECT ANSWER WILL GET BRAINLIEST!
Answer: D
Explanation:
The wind is the atmosphere and the birds are the biosphere
Hope this helps
Which layer of the ocean do you think is most impacted by the Great Pacific Garbage Patch? Explain your answer.
The layer most affected by the Great Pacific Garbage Patch is the abyssopelagic zone or bottom layer of the ocean.
What is Great Pacific Garbage Patch?The term Great Pacific Garbage Patch refers to the accumulation of debris that have long been found along the North Pacific Ocean.
It has affected the ecosystem in the affected area and its impact is more greatly felt in the abyssopelagic zone or bottom layer of the ocean.
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Difference between pure tone and speech audiometer
Answer:
Speech audiometry was performed on 15 children with secretory otitis media pre-and post-operatively and the findings compared with the pre-and post-operative pure tone audiograms. The results showed that in 30 per cent of cases pre-operatively the speech audiogram suggested a significantly worse hearing ability than that suggested by the pure tone audiogram (PTA). Where a PTA gives a borderline threshold disproportionate parental concern should be taken seriously as the hearing ability may well be worse than the PTA suggests.
How are nebulae and stars related? Select the three correct answers.
A. Stars explode to form nebulae.
B. Nebulae explode to form stars.
C. Nebulae form from stars.
D. Stars are pulled toward nebulae.
E. Stars form from nebulae.
F. Ebulae are found inside stars.
Answer:
Stars form from nebulae. Stars explode to form nebulae. Nebulae form from stars. (are the correct answers)
Explanation:
Nebulae and stars are related in the following ways:
Stars explode to form nebulae.Stars form from nebulaeNebulae form from stars.Nebulae refer to a giant cloud that consists of gas and dust that are in space. They're bodies of clouds that are special. It should be noted that nebulae consist of helium, hydrogen, cosmic dust, etc. It should be noted that in some nebulae, there are stars that are formed from large clouds of dust and gas.In such a case, when some stars have been formed in the cloud, they'll then illuminate the cloud with their lights.In conclusion, it should also be known that when there is an explosion of a star that's dying, this then forms nebulae.
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Which of the following is NOT part of the Cell Theory?
A. All organisms are composed of cells
B. Cells come from pre-existing cells.
C. Cells are the unit of life within an organism.
D. All organisms are composed of 2 or more cells.
E. All of these choices are parts of the Cell Theory.
Answer:
Hi, there I believe your answer will be
D because In the cell theory
It has 3 cell theory info which are:
The cell is the basic unit of life.
All living organisms are composed of cells.
All cells come from pre-existing cells.
Hope this helps :)
Explanation: