The number of yeast cells in a laboratory culture increases rapidly initially but levels off eventually. The population is modeled by the function а n = f(t) = 1 + be-0.90 where t is measured in hours. At time t = 0 the population is 30 cells and is increasing at a rate of 24 cells/hour. Find the values of a and b. a = b = According to this model, what happens to the yeast population in the long run? O The yeast population will shrink to 0 cells. The yeast population will stabilize at 270 cells. The yeast population will stabilize at 135 cells. The yeast population will stabilize at 8 cells. O The yeast population will grow without bound.
Answer:
Explanation:
[tex]n=f(t)= \frac{a}{(1+be^{-.9t})}[/tex]
At t = 0
30 = [tex]\frac{a}{1 + b }[/tex]
30 + 30 b = a
[tex]\frac{dn}{dt} =f(t)= \frac{-.9abe^{-.9t}}{(1+be^{-.9t})^2}[/tex]
For t = o
[tex]\frac{dn}{dt} =f(t)= \frac{.9ab}{(1+b)^2}[/tex]
given
24 = [tex]\frac{.9ab}{(1+b)^2}[/tex]
24 = [tex]\frac{30\times.9b }{1+b}[/tex]
24 = 27b / 1 + b
24 + 24 b = 27 b
24 = 3 b
b = 8
a = 30 + 30 x 8 = 270
[tex]n=f(t)= \frac{a}{(1+be^{-.9t})}[/tex]
Put t = infinity
n = a = 270
So at infinite time yeast population will stabilise at number 270 .
Which of the following is always involved in a scientific inquiry? A. conducting experiments based on scientific questions B. guessing what would happen instead of doing experiments C. knowing the correct answer before you start D. conducting surveys to ask people's opinions on various subjects
Answer:
I'm pretty sure it's a I'd its wrong I'm sorry
Answer:
developing solutions to questions through scientific research
Explanation:
Scientific inquiry involves coming up with questions based on observation and reasoning, conducting experiments based on scientific questions,and developing solutions to questions through scientific research.
what is the central dogma of biology? QUICK PLEASE
Answer:
The central dogma states that the pattern of information that occurs most frequently in our cells is: From existing DNA to make new DNA (DNA replication?) From DNA to make new RNA (transcription) From RNA to make new proteins (translation).
Explanation:
What is the independent variable in this experiment?
Answer:
D
Explanation:
because it was the variable that was changed in the experiment. distance was controlled and speed changed with time.
The first ionization energy of fluorine and iodine
Answer:
The most electronegative atom, fluorine, is assigned a value of 4.0, and values range down to cesium and francium which are the least electronegative at 0.7. First Ionization Energy of Iodine First Ionization Energy of Iodine is 10.4513 eV.
Explanation:
Describe the three phases of matter (solid, liquid, and gas) in terms of particle spacing, ability to fill shape and volume of container, energy of particles , and strength of intermolecular forces
Answer: solids are tense but spread out. Gas is spread out completely and liquid is all together
Explanation:
What is the activation energy of a reaction?
Answer:
The activation energy for the forward reaction is the amount of free energy that must be added to go from the energy level of the reactants to the energy level of the transition state. ... Once a reactant molecule absorbs enough energy to reach the transition state, it can proceed through the remainder of the reaction.
Explanation:
Answer: Activation energy is how much energy it takes for a reaction to occur.
Explanation:
A procedure calls for 0.250 kg of sugar. Your balance is in ounces. What mass in ounces should be weighed out on this balance?
Answer:
8.81849
Explanation:
i believe the whole number would be this but usually i round to the second decimal point, i dont know if you could do that in chemistry tho
If anyone have the answers to this plz tell me
Explanation:
hey can I please get the passage so that I can help you
why is diamond hard
The outermost shell of each carbon atom has four electrons. In diamond, these electrons are shared with four other carbon atoms to form very strong chemical bonds resulting in an extremely rigid tetrahedral crystal. It is this simple, tightly-bonded arrangement that makes diamond one of the hardest substances on Earth.
Answer: Diamond is hard due to its giant covalent lattice and it has many strong covalent bonds.
Explanation:
POSSIBLE POINTS: 26.67
Match the seasons for the Northern Hemisphere, Winter, Spring Summer, Fall to the different points on the diagram
Answer:
vv
Explanation:
Point A: Summer
Point B: Fall
Point C: Winter
Point D: Spring
Which is a homogenous mixture?
1. ceasar salad
2. pre-cooked pizza
3. coffee in a cup
4. different color beads in a bowl
Answer:
ceasar said is a homogeneous mixture
Answer:
ceasar salad
Zinc has an average atomic mass of 65.37 amu. Jack is trying to figure out what the most abundant isotope of zinc is, but he doesn't have access to the internet, so the average atomic mass is the only information he has. Jack decides to made an educated guess as to the most abundant isotope of zinc by assuming there are only two isotopes of zinc. If Jack assumes there are only two isotopes of Zn, what he be most likely to decide is zinc's most abundant isotope?
Question 5 options:
Zinc-64
Zinc-65
Zinc-68
Zinc-66
Zinc's most abundant isotope : Zinc-65
Further explanationIsotopes are atoms whose no-atom has the same number of protons while still having a different number of neutrons.
So Isotopes are elements that have the same Atomic Number (Proton)
Atomic mass is the average atomic mass of all its isotopes
In determining the mass of an atom, as a standard is the mass of 1 carbon-12 atom whose mass is 12 amu
Mass atom X = mass isotope 1 . % + mass isotope 2.%
To decide zinc's most abundant isotope, then choose the closest mass number
or we can check the difference with the average mass number, if the value is the smallest, then that isotope has the largest abundant
Zinc-64[tex]\tt \dfrac{65.37-64}{65.37}=0.021[/tex]
Zinc-65[tex]\tt \dfrac{65.37-65}{65.37}=0.005[/tex]
Zinc-68[tex]\tt \dfrac{68-65.37}{65.37}=0.04[/tex]
Zinc-66[tex]\tt \dfrac{66-65.37}{65.37}=0.009[/tex]
The closest = Zinc-65(the smallest)
I WILL GIVE YOU BRAINLIEST!!!
which sentence uses emitting correctly
A after emitting his mistake, Charlie vowed to make things better.
B Charlie should be emitting an apology.
C Charlie heard birds emitting a very strange sound.
D the emitting sound of an early moring birds woke charlie.
Answer:
its either A or C
Explanation:
Q) which sentence uses emitting correctly ?
Answer :(c) Charlie heard birds emitting a very strange sound .Explanation :
Emitting means ' to give off ' , since birds are giving off a strange sound , we say " Charlie heard birds emitting a very strange sound " .
In the human body, a series of chemical reactions results in the making of energy that is used at both the cellular and organismal levels.
In which course would a person most likely study these chemical reactions?
biochemistry
geochemistry
materials chemistry
physical chemistry
Answer:
It is A: biochemistry
Explanation: i seen there was no answer so i took a chance and surprisingly got it correct
Answer:
e correct option is all of the above
Explanation:
how much electrons are present in MnO4-
In dilute aqueous solution, as [H+] increases:
A. pH decreases
B. pOH increases
C. [OH-] decreases
Answer:
B
Explanation:
The answer is B, I hope this helps you!
PLEASE SOMEONE HELPP
Answer:
D
Explanation:
How
myny moles are present in 5.6x1022 atoms of Ne? (0.09 moles Ne)
Sot ne10.05
Answer:
mole = no of atoms/ 6.02E23.... so therefore answer= 5.6E22/6.02E23= 0.093✨
What is often added to the water used when reacting the group 1 metals with
water?
Universal indicator
An acid
An alkali
Oil
What is produced when sodium reacts with water?
Sodium oxide and water
Answer:
an acid.
sodium oxide and water
how would you differentiate between acid and bases if the list of their chemical formula is given to you
A student mixed several different 12 mm plastic beads together by mistake. Luckily the beads had different densities. One group of beads had a density of 0.6 g/cm3; the other beads had a density of 1.2 g/ cm3. Describe a method the student can use to sort the beads.
Answer:
The answer is "Each student will get a glass of water and drop the bead into it but the beads float 0.6 g / cm3 and slip down to 1.2 g / cm3
".
Explanation:
One's masses would've been dissimilar, even though their width and concentrations were also equal. Whenever the type-A mass is m, then the type-B mass is 2 m. One should measure then, therefore.
Water has a 1g / cm^3 density. Although Type A is higher than air, Type B is much more compact. it means will float if they place it in water type-A where type-B sinks.
A sample of gas has a volume of 526 mL at 346 mmHg and 35.0°C. Determine the moles of gas.
Answer:
The moles of gas is 0.009474 moles.
Explanation:
Given that,
Volume = 526 mL
Pressure = 346 mmHg
Temperature = 35.0°C
We need to calculate the moles of gas
Using formula of ideal gas
[tex]n=\dfrac{PV}{RT}[/tex]
Where, P = pressure
V = volume
R = gas constant
T = temperature
Put the value into the formula
[tex]n=\dfrac{\dfrac{346}{760}\times0.526}{0.08206\times(35+273)}[/tex]
[tex]n=0.009474\ moles[/tex]
Hence, The moles of gas is 0.009474 moles.
In what type of inheritance do you see both traits on the same individual, but not
blended?
a. Incomplete Dominance
b. Codominance
c. Both
d. Neither
I NEED HELP WITH THIS ASAP!!!!!!!!!!!!!
Which chemical equation best represents the Law of Conservation of
Mass?
A. H+0 -> H20
B. H2 + 02 --> H20
C. 2H2 + 02 --> 2H,0
D. H2 + 02 --> 2H,02
Answer: The answer is B
Explanation:
3. compounds in which elements are held together by covalent bonds...keeps their own properties
A polar molecule
B. element
C. compound
D. molecule
can someone explain what radioisotopes are?
Answer:
A radioisotope is a radioactive isotope.
Explanation:
On the Periodic Table, elements 92 and up are radioactive. So that is Uranium and any higher elements. Remember that radioactive elements love to decay and are dangerous.
Isotopes are different forms of an element. For instance, we could have different amount of neutrons in the same element (same number of protons).
We could have an element like He - 4 vs. He - 6, where He - 4 would have 2 neutrons and He - 6 would have 4 neutrons.
So a radioisotope would be an elemental isotope that is radioactive. A good example of this is Uranium.
We have thousands of different isotopes of Uranium, but 2 are well known: Uranium - 235 and Uranium - 238. Both are the same element with the same amount of protons, but both have a different amount of neutrons.
Ribosomes are cell structures that make
Ribosomes are cell structures that make protein. They are the primary site of the synthesis of protein. They are made up of protein and RNA.
What are ribosomes?Ribosomes are cell organelles scattered in the cytoplasm of the cell. They are tiny and round vesicles. They are present in both prokaryotic and eukaryotic cells. Furthermore, they are present freely in the cytoplasm. Ribosomes are also present near the endoplasmic reticulum.
Ribosomes are made up of RNA and protein, and they synthesize the protein in the cell. Ribosomes read the mRNA and by these codes of mRNA, it constitutes amino acids, that grow into a long chain of the protein.
Thus, ribosomes are the parts of cells that produce protein. They serve as the central location for protein production. They are composed of RNA and protein.
To learn more about ribosomes, refer to the link:
https://brainly.com/question/241631
#SPJ6
Which of these processes are chemical reactions? Type the correct answer in each box.
Boiling an egg
Crushing spices
veges rotting
chopping veges
dew forming
Which noble gases is closest to magnesium? On the periodic table? What must happen if a magnesium atom for it to have an electron arrangement similar to that of a noble gas?
Answer:
Neon and loose electrons
Explanation:
Magnesium has an electron configuration of 2e 8e 2e, and Neon is 2e,8e. For Mg to have a similar electron arrangement it must loose its two valence electrons and make it an ion.
Answer:
Noble neon gas is the closest.
Explanation:
noble Neon gas
The Magnesium would have to lose two electrons