The culture you are working has a doubling time of 2 hours and a cell density of 3 x 10^6 cells per mL. For your experiment, you first dilute the culture 100 fold. Assuming that there is no lab phase and that the cells remain in exponential growth the entire time, what is the cell density (cells/mL) after 10 hours
The cell density (cells/mL) = 15× 10^6 cells per mL.
Calculation of cell densityThe doubling time of culture = 2 hours
The cell density after 2 hours = 3 x 10^6 cells per mL
Since the dilution did not affect the lag phase and exponential growth rate, the cell density after 10 hours is calculated below:
2 hour = 3 x 10^6 cells per mL
10 hours = X
Cross multiply,
[tex]x = \frac{10 \times 3 \times10 {}^{6} }{2} [/tex]
[tex]x = \frac{30 \times 10 {}^{6} }{2} [/tex]
X= 15× 10^6 cells per mL
Therefore, the cell density in (cells/mL) after 10 hours = 15× 10^6 cells per mL.
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what are those areas or concern of industrial psychology
TRUE or FALSE: If the Earth did not rotate major currents of wind and water would go straight north and south without curves.
What 3 make up a nucleotide??
Answer:
the correct answer is B
Explanation:
9. On some small islands in the Pacific Ocean, the average sea level is rising on the beaches little by little each year. Residents of the islands are worried that their island, and their homes, may become flooded in a few years. What is the most likely cause for the water level to increase?
a. They are getting more rain in their area.
b. The tides are more dramatic because of the number of full moons they have experienced.
c. Ice from the North and South poles is melting and adding to the water in the ocean.
d. The waves are bigger because of increased winds.
10. Hurricanes are large storms that form over warm waters out in the ocean. Hurricanes are associated with low-pressure regions in the atmosphere. How does the low pressure associated with a hurricane help them to grow big and powerful?
a. Air in the atmosphere tends to move toward low-pressure regions, which would increase the winds surrounding a hurricane.
b. Low-pressure regions push away other air in the atmosphere, which would make the hurricane bigger.
c. Low-pressure air heats up the water and therefore makes the hurricane stronger.
d. Low-pressure conditions means slow winds, which makes the hurricane stronger.
11. Based on the northern location of England on the map, it appears that it would have a cold, harsh climate. In reality, England has a mild climate because of the warm Gulf Stream current in the Atlantic Ocean. How does the Gulf Stream current help keep England's climate mild?
a. The warm water of the Gulf Stream warms the land of England where they meet.
b. The warm Gulf Stream waters heat the air over the ocean, which then moves over England.
c. The warm Gulf Stream waters make the air very humid, which results in a milder climate in England.
d. The warm Gulf Stream waters attract the cold air from England, thus keeping England mild.
12. The atmosphere surrounding Earth helps to maintain the various climates found around the world and keeps Earth from becoming extremely cold all over. How does the atmosphere help to keep Earth insulated and warm?
a. The atmosphere creates heat as Earth moves through space, helping to insulate Earth.
b. The atmosphere traps the heat generated by Earth's core and helps maintain Earth's climate.
c. The atmosphere helps spread the warmth from the water near the equator to other parts of Earth.
d. The atmosphere helps trap heat energy from the Sun and energy radiated from Earth to maintain the climate.
13. Convection currents in the atmosphere influence many weather patterns. What property of the air has the most influence on convection currents?
a. the direction of the wind
b. the velocity of the wind
c. the temperature of the air
d. the mass of the air
14. When nitrogen is returned to the soil when dead plants decompose, the interaction is between which two spheres?
a. Hydrosphere and geosphere
b. Cryosphere and geosphere
Answer:
the answer is always c trustttt
8. As a group, write a grammatically correct sentence that explains what a chromosome is and why it is important.
Answer:
it is a strand of DNA that carries information from generation to generation
Explanation:
it is important because it is responsible for transferring genetic information, from each chromosome to the other during meiosis or mitosis
How long can it take for primary forest succession to reach the climax, or old-growth, forest?
5 to 20 years
70 to 100 years
1 to 3 years
250 to 600 years
It take over 600 years for primary forest succession to reach the climax, or old-growth, forest. i.e,option D
What is primary succession?Succession on land that did not previously have plants, such as soil exposed as a glacier retreats or a new sand bar in a river is called primary succession.
It takes over 600 years to primary forest succession to reach the climax. it includes breakdown of the rocks into soil and plants help in survival of different animal and progress from primary succession to the climax community.
Hence, option 'D' is correct.
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give ways for increasing and reducing friction
Explanation:
Methods to increase or reduce friction
Grease is added between the moving parts in machines, to reduce friction. Another method of reducing friction is by using bearings. When ball bearings are introduced between two surfaces friction is reduced because of the freely rotating metal balls.
Answer:
Methods to increase or reduce friction
Grease is added between the moving parts in machines, to reduce friction. Another method of reducing friction is by using bearings. When ball bearings are introduced between two surfaces friction is reduced because of the freely rotating metal balls.
Explain why controls are vital to scientific investigations?
because it allows the experiment to minimize the changes in all other variables except the one being tested
Help me with this please don’t get wrong
Answer:
b c and d
bcoz this is talking about the cell membrane
whats genetics and breeding
Answer:
Genetics- this is the scientific study of genes and heredity.
Breeding- The production of offspring by animals.
what is the approximate difference in the yearly us investment for erosion control and the cost of damage erosion causes each year
The amount spent on erosion control is far less than the amount spent on the control of damage caused by erosion each year.
What is erosion control?The term erosion control refers to the various processes that are put in place to prevent the occurrence of erosion. These process are far more cheaper than taking care of the damages caused by erosion.
Damages caused by erosion take huge amount in dollars to remediate. Far less than that such sum can be invested in erosion control.
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Please help with this
Answer:
I think its AIDS.
True or false-A nerve tissue consists of up nerve and muscle cells
Answer:
False
Explanation:
it consists of neuron and neuroglia
Answer:
False
Explanation:
It consists of neurons and glial cells
What are two contributing factors to evolution?
Why are all four chromatids different?
Answer:
They differ from both parents and also from each other. This occurs through a number of mechanisms, including crossing-over, the independent assortment of chromosomes during anaphase I, and random fertilization. When homologous chromosomes form pairs during prophase I of meiosis I, crossing-over can occur.
Explanation:
I hope this helps!!1.
Which of these would not be used by a
scientist to determine the evolutionary
relationship between two species?
A. bone structure
B. fossils
C. DNA
D. population size
Answer:
Population size should be the correct answer
Explanation:
What are materials that need to enter and exit a cell?
Answer:
oxygen
Explanation: air goes through the fibers and act as nutrients
Answer:
Water (H₂O), Carbon dioxide (CO₂), and Oxygen (O₂) are few simple molecules that can enter and exit from the cell membrane by diffusion or Osmosis.
-TheUnknownScientist 72
can you do short answers because it will not allowed you to write that much on the paper. Plz and ty!!!.
what would this answer be, i’ll give you brainlist
Impact of lymphatic disorder
Answer:
The lymphatic system clears away infection and keeps your body fluids in balance. If it's not working properly, fluid builds in your tissues and causes swelling, called lymphedema. Other lymphatic system problems can include infections, blockage, and cancer.
Explanation:
II found this on the internet cause i don't really know. Hope it helps
One shrimp was introduced into a tube with pond weed and the tube was placed in a bright light for 5 hour what would the color be if we add hydrogen carbonate
sorry i cant help u with that
A cell or group of nerve endings which receive stimulus and transmits the impulse to the spine or brain is called the effector.
True or false
Answer:
True
Explanation:
Effector is an organ or cell that acts in response to a stimulus.
Where do babies come from?
Answer:
Tbh they come from the Male sperm and the Female egg. Once the sperm fertilizes the egg then you have a baby! That's the short and simplified answer
Explanation:
How would filling in
wetland to create a field affect the surrounding environment?
Answer:
The filling in a wetland can have bad effects, such as burring the wetland vegetation, increasing the elevation, and eliminating periodical inundation of the wetland.
Explanation:
Filling in a wetland can be done with various types. One of them is communal waste. Also, the construction materials are disposed of in wetland areas.
This can produce dangerous chemical elements and release toxins. Filling in the wetland can cause the loss of these areas and the fertile lands used for agriculture.
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The rate of at which producers create
organic matter is called what?
A. primary productivity
B. primary succession
C. biomass index
Answer:
A. Primary productivity
I need help with this question please
Answer:
(b)
Explanation:
when it is come together the sperm and the egg
Answer soon as possible would be appreciated!!!!
The events taking place in two different locations are described below:
Location A: Movement of plates causes hot spots to move to a location with thinner crust
Location B: Tectonic plates move away from each other under the sea
In which location will active volcanoes most likely be formed and why?
Location A, because the magma breaks through the thin crust
Location A, because cracks between plates are filled with molten rocks which solidify
Location B, because the oceanic plate and continental plate are pushed up through the crust
Location B, because the thinner oceanic plate will be pushed under the continental plate
Answer:
Location B, because the oceanic plate and continental plate are pushed up through the crust
Explanation: hope it helps
Answer:
Location B, because the oceanic plate and continental plate are pushed up through the crust
Explanation:
I took the test and got it right
Can somebody help with this please I can’t find the answers and my teacher is no help
Answer:
Fossa -> D
Head-> E
Tubercle-> C
Condyle -> A
Epicondyle -> B
Explanation:
is it safe to eat something from a dirty floor.. I'm worried cuz I did :D , I raged so I threw my food on the floor and I was out of my mind when I continued eating it because I was so angry...
Answer:
If your floor was clean then it should be fine, it's gross, but normally it's fine.
Explanation:
The bacteria on the floor isn't normally harmful toward people but if you have a compromised immune system then you could get sick.
Answer:
yes and no
Explanation:
there are good bacteias in this world and there is bad bacteria it is dangerous because the unkown virusus and bad bacterias can be found in the floor or ethier cannot be found in the floor it depends how much cleaning it is going through so yea it depends and another thing that is confirmed is how long it has been in the floor