Environmental scientists calculating pollutant half-lives often define a transport rate constant that is analogous to a reaction rate constant and describes how a pollutant moves out of an ecosystem. In a study of the gasoline additive MTBE in Donner Lake, California, scientists from the University of California, Davis, found that in the summer the half-life of MTBE in the lake was 26.01 days. Assume that the transport process is first order. What was the transport rate constant of MTBE out of Donner Lake during the study
Answer:
k ≈ [tex]2.7 *10^{-2} d^{-1}[/tex]
Explanation:
For a first order reaction
Half life ( [tex]t_{1/2}[/tex] ) = 0.693 / k
k = rate constant
[tex]t_{1/2}[/tex] = 26.01
hence k = 0.693 / ( 26.01)
k ≈ 2.7 * 10^-2 d^-1
This is a detailed simple solution as required
I need no answer I am just here to give you points
Answer:
thanks lol :)
Explanation:
Giving out branlyest
Answer:
C
Explanation:
Which term is used to describe an inherited trait that gives an organism and advantage in its particular environment?
A. Speciation
B. Unicellular organism
C. Adaptation
D.vestigial organ
Answer:
C. Adaptation...........
Sickle cell anemia is a genetic condition that occurs because of a single point mutation in the DNA gene for hemoglobin. How is this mutation expressed in humans?
A.) The protein coded by the DNA has a different amino acid sequence
B.) The chromosome caring this gene changes shape during cell reproduction
C.) The hormones in the bladder change by increase differences in genes
D.) The carbohydrate code by the DNA has a different structure
Answer:
B.) The chromosome carrying this gene changes shape during cell reproduction
Explanation:
According to this question, Sickle cell anemia is a genetic condition that occurs when the HBB gene that codes for haemoglobin protein undergoes a point mutation. Mutation alters the genetic sequence of a gene.
This mutation expresses itself when the chromosome 11 carrying the mutated gene changes shape during cell reproduction. Normal Red Blood Cell has a disc-shaped structure, however, this mutation causes a change in shape of the chromosome involved.
Consider two genes that are independent, the A gene and the B gene. Each gene has two alleles (A gene: A1 and A2, B gene: B1 and B2). The frequency of A1 allele at the A gene is 0.85 and the frequency of the B2 allele at the B gene is 0.24. What is the probability of an individual in a randomly mating population of having A1B2|A2B1 as their genotype
Answer:
The probability of an individual in a randomly mating population of having the genotype A1B2|A2B1 = 0.658 = 65.8% ≅ 66%
Explanation:
Due to technical problems, you will find the complete explanation in the attached file
g Humans have two sources of cholesterol: absorption from ingested food and de novo synthesis by the liver. High levels of cholesterol in the blood correlates with cardiovascular disease, but cholesterol is required to regulate membrane fluidity and is a precursor for important molecules like steroids and bile acids. Thus, humans evolved several types of regulation of cholesterol levels. How does the human body compensate for excess consumption of cholesterol in the diet
Answer:
Explanation:
Cholesterol is an important dietry intake that is gotten from saturated fats
About 200–300 mg of this dietry intake is produced or added daily.
The body compensates for excess cholesterol intake by reducing the amount of cholesterol that is synthesized. This is done by reusing the existing cholesterol in the body and the excretion of excess cholesterol into the digestive tract this is done by the liver through the bile.
About 50% of the excreted cholesterol is reabsorbed back into the bloodstream for use by the small intestines.
Mercury is often used in thermometers. The mercury sits in a bulb on the bottom of the thermometer and rises up a thin capillary tube as the temperature rises. Suppose a mercury thermometer contains 3.380g of mercury and has a capillary that is 0.200mm in diameter. How far does the mercury rise in the capillary when the temperature changes from 0.0 0C to 25.0 0C
Answer:
3.5 cm
Explanation:
Mass of mercury = 3.380
Diameter = 0.200
At t = 0 and 25 degrees we have 13.596 and 13.543 as density
At 0 degree = v = 3.380/13.596 = 0.2485
At 25 degrees = 3.380/13.534 = 0.2497
We use volume of cylinder to get height
At 0⁰ height = 7.91
At 25⁰ = 7.944
The difference in height = 0.035
Multiply by 100 = 0.35 x100
= 3.5cm
1.Compare and contrast a cold and warm front.
2. Along which type of front is the weather the calmest? Justify your answer.
Answer:
A cold weather front is defined as the changeover region where a cold air mass is replacing a warmer air mass. Cold weather fronts usually move from northwest to southeast. ... Warm fronts usually move from southwest to northeast and the air behind a warm front is warmer and moister than the air ahead of it.
ExplanationThere are four different types of weather fronts: cold fronts, warm fronts, stationary fronts, and occluded fronts. the direction of flow of the air mass and its characteristics. so based on what we know i would say that warm fronts are calmest
According to the chart below, which planet contains the most hydrogen gas?
Saturn
Jupiter
Venus
Earth
Answer:
Saturn
Explanation:
As you can see from the chart, the hydrogen gas is labeled by the turqoise part of the bar chart. To find which one has the most hydrogen gas, select the planet where the bar with hydrogen gas is the highest. If you compare, you will notice that neptune and jupiter have the least because the hydrogen gas is lowest on the bar chart, Saturn and uranus have a higher concentration of this gas but saturn has more than uranus respectively.
(5) Give three (3) diferences between protons and electrons
A Helium atom has 2 protons in the center of its nucleus. Therefore its atomic number is 2. Its mass is
greater than the mass of these 2 protons. Which of the following accounts for this difference in mass?
A neutrons
B molecules
C nuclei
D electrons
Answer:
I dont know for sure, but I would have to say electrons. Please tell me if I'm wrong
two example of epidemic diseases
Answer:
1) Chikungunya
2) Cholera
Explanation:
Answer:
1. Whooping cough
2. Smallpox
Explanation:
What is permineralization?
Answer:
process of fossilization , which mineral deposits form internal casts of organisms.
Explanation:
Answer:
this is a process of fossilization in which mineral deposits from internal casts of organisms. when carried by water, these minerals fill the spaces within organic tissues. examples are most dinosaur bones, petrified wood and many trilobite fossils
Explanation:
when an organism is berried, the minerals which are carried by water, for example, silica, calcite or pyrite will replace the organic material in the fossil.
Identify two of reaction that take place in photosynthesis process and state specifically where in the cell cloes each reaction take place
Answer:
light-dependent reactions and the Calvin cycle.
Explanation:
light-dependent reactions and the Calvin cycle. Light-dependent reactions, which take place in the thylakoid membrane, use light energy to make ATP and NADPH.
Amino acids are joined by dehydration synthesis and link by a blank bond.
Answer:
What is the question?? :}
Explanation:
You isolate an organism from a water sample and test it with a catalase test and grow it in thioglycollate medium. The results showed bubbling after the addition of hydrogen peroxide and a band of growth at the top of the thioglycollate tube. What is the most likely oxygen classification of your organism
Answer: The most likely oxygen classification is OBLIGATE AEROBIC ORGANISM.
Explanation: Most medically important bacteria can be grown artificially in the laboratory provided the atmospheric conditions and temperature are correct and the culture medium used contains the required nutrients.
The thioglycollate medium is used to differentiate oxygen requirements in an isolated organisms. While catalase test is used to differentiate catalase producing from non-catalase producing organisms.
Differences in the effect of oxygen on bacterial growth provide a further way of classifying bacteria:
● OBLIGATE AEROBES, which require free oxygen to grow,
● obligate anaerobes, which are unable to grow in free oxygen,
● facultative anaerobes, which can grow in conditions in which oxygen is present or absent,
● microaerophiles which grow best in conditions of reduced oxygen concentration.
The most likely oxygen classification is OBLIGATE AEROBIC ORGANISM because from the result of the test carried out on the isolated organisms,
--> The organism is catalase positive as it was able to breakdown hydrogen peroxide to oxygen and water( bubbling after the addition of hydrogen peroxide confirmed it as positive). Catalase is an enzyme produced by all aerobic organisms.
--> while in the thioglycollate medium the organism grew at the top of the test tube in order to absorb maximal amount of oxygen.
The heron has long legs so that it can walk in the shallow water and catch fish.what is this type of adaptation called?
Answer:
Aquatic Adaptation
The diagram shows a process taking place between molecules X and Y that provides energy to cells.
What are molecules X and Y?
Answer:
They are ATP and ADP. ....
what is occurring during the mitosis phase
Answer:
During mitosis, a eukaryotic cell undergoes a carefully coordinated nuclear division that results in the formation of two genetically identical daughter cells. ... Then, at a critical point during interphase (called the S phase), the cell duplicates its chromosomes and ensures its systems are ready for cell division.
Explanation:
Describe two ways that humans influence the cycling of matter in ecosystems.
Explanation:
Two important ways by which humans have affected the carbon cycle, especially in recent history, are: 1) the release of carbon dioxide into the atmosphere during the burning of fossil fuels, and 2) the clearing of trees and other plants (deforestation) that absorb carbon dioxide from the atmosphere
Below is a list of physiological events involved in modulating respiratory rate. Using your knowledge from class, place the events in the correct order.
A. Medullary respiratory centers are stimulated.
B. CO2 levels in blood decline.
C. Somatic motor impulses are sent to the respiratory muscles.
D. Diaphragm and external intercostals contract at a faster rate.
E. More CO2 is exhaled.
F. Extracellular fluid surrounding brain decreases in pH.
G. PCO2 increases in blood H. CO2 produces H by reacting with water.
I. Central chemoreceptors are stimulated.
J. pH of brain extracellular fluid returns to normal.
Answer:
The events in the order are,
G. PCO2 increases in blood.
H. CO2 produces H+ by reacting with water.
F. Extracellular fluid surrounding brain decreases in pH.
I. Central chemorEceptors are stimulated.
A. Medullary respiratory centers are stimulated.
C. Somatic motor impulses are senT to respiratory muscles.
D. diaphragm and external intercostal muscles contract at a faster rate.
E. More CO2 is exhaled.
B. CO2 levels in blood decline.
j. pH of brain extracellular fluid returns to normal.
Explanation:
In physiological events that take place in modulating respiratory rate is a compensatory mechanism occurs in the case of respiratory acidosis. In respiratory acidosis, carbon dioxide level increases in blood so the partial pressure of carbon dioxide will be higher.
The high amount of carbon dioxide is responsible for the formation of the bicarbonate and hydrogen ion this process continues, which decreases the normal pH. Chemoreceptors sense this change that activates the respiratory centers. and sends motor signals for the contraction of inspiratory muscles, which increases the rate of respiration.
The correct order of events in listed above.
A new protein factor named PF2 was recently isolated from mammalian cell nuclei. Among other protein domains, PF2 exhibits an RPD3-interacting domain (RPD3 contains the catalytic activity of the HDAC B complex) and a TFS-interacting domain (TFS is a DNA binding protein). PF2 does not have a DNA binding domain, however. Predict a likely function of PF2 and justify it. The importance of both domains should be explained.
Answer:
The likely functions of PF2 includes binding of several protein factors and DNA structure formation
Explanation:
PF2 contains RPD3 and TFS domains
The likely functions of PF2 includes binding and DNA structure formation
For the RPD3 domain that contains the catalytic activity of the HDAC B complex its function is to interact with other protein factors by binding with them and carrying out the process of the signaling cascade.
while the TFS - interacting domain have likely functions like ; DNA replication, DNA repair and storage. It also has the function involving the DNA structure
If you have type A blood, what are your possible genotypes? ……………………………….
If you have type B blood, what could your genotypes be? ……………………………….
If you have type AB blood, what must your genotype be? ……………………………….
If you have type O blood, what must your genotype be? ………………………………
Pattern of inheritance ………………………………
Answer:
Explanation:
1.Their genotype is either AA or AO
2.blood type B could have a genotype of either BB or BO
type AB or type O is more informative.
3. Someone with blood type AB must have both the A and B alleles. The genotype must be AB.
4.Someone with blood type O has neither the A nor the B allele. The genotype must be OO.
Pattern of inheritance;
There are five basic modes of inheritance for single-gene diseases: autosomal dominant, autosomal recessive, X-linked dominant, X-linked recessive, and mitochondrial.
Seeds can be direct sown in the place they will grow until maturity, or sown in containers first, and transplanted later.
Group of answer choices
True
False
Factors that affect the diffusion
Answer:
Temperature is one factor that can affect the rate of diffusion. Diffusion occurs faster in warmer temperatures, and occurs slowly in cooler temperatures.
7 difference between Arteries, vain and capillaries
Answer: Hope this helps answer in explanation.
Explanation:
1) These are responsible for the transportation of blood from the heart to all parts of the body. These vessels collect blood through capillaries and transport it towards the heart. These vessels connect arteries and veins.
2. All arteries carry oxygenated blood except pulmonary arteries which carry deoxygenated blood. All veins carry deoxygenated blood except pulmonary veins which carry oxygenated blood. These carry mixed oxygenated and deoxygenated blood.
3. Arteries have no valves in them except at the base of the pulmonary trunk and aorta. Valves are present in veins. These valves prevent the backflow of blood. There are no valves in them.
4. Arteries have high blood pressure. Veins have low blood pressure. There is falling pressure in them.
5. In arteries, waves of blood pressure or pulse due to heartbeat can be detected. There is no pulse. There is no pulse.
6. Blood flows rapidly between 400-500mm per second in the aorta and decreasing in arteries and arterioles. The rate of blood flow increases from smaller to larger veins. Blood flow is slowest which is less than 1mm per second.
7. Arteries have a smaller bore and thick walls. Veins have a larger bore and thin walls. Capillaries have a larger bore and the wall is of one cell in thickness.
8. There are thick muscle layers and elastic fibers present. The elasticity helps to change the pulsating flow of blood. There are thin muscle layer and less elastic fibers present in veins. So, they are less elastic. No muscles or elastic fibers are present.
9. There is no exchange of materials. There is no exchange of materials. These are responsible for the exchange of gases and nutrients.
which way does water move when an egg is placed into a container of water
A. into the egg
B. out of the egg
C. It does not move
the fruit with multi seeds proves that the ovary had multi ________
The answer maybe 'Ovules'....
Answer:
Maybe it's follicles?.......
how do water and living things interact?