Arsenic is natural element widely distributed in the earth's crust.
There are two forms of arsenic organic and inorganic.
Symbol: As
Electron configuration: [Ar] 3d¹⁰4s²4p³
Atomic number: 33
Atomic mass: 74.9216 u
Electronegativity: 2.18
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Explain why the biomass of secondary consumers is always lower than the biomass of primary consumers.
Answer:
Because energy is lost in the transfer from one level to the next, there is successively less total energy as you move up trophic levels. In general, we would expect that higher trophic levels would have less total biomass than those below, because less energy is available to them.
Based on the information in the graph, what is the best conclusion to draw
about Africa?
World Population Growth
20,000
10,000
World
5,000
Asia
2,000
Africa
1,000
Europe
WANIA
500
200
100
United States,
Canada, and Greenland
Mexico,
Central America, Caribbean Islands,
and South America
Oceania (Australia and
nearby islands in the Pacific)
50
20
10
1950
1960
1970
A. The fertility rate is very low.
1980
1990
2000
2010
2020
2030
2040
2050
B. It has reached its carrying capacity.
C. The birthrate is higher than the death rate.
oc
D. It has few resources.
The correct answer is C. The birthrate is higher than the death rate.
Explanation
The graph is about the growth of the world population, this shows the population growth of the world, Asia, Africa, Europe, United States, Canada and Greenland, Mexico, Central America, Caribbean Islands, and South America, and Oceania (Australia and nearby islands in the Pacific). This graph covers the time from 1950 to 2050 divided into decades. In the specific case of Africa in 1950 it had a population of close to 300 million people. Subsequently, in 2010 the population of Africa was close to 1 billion people and the projection for the year 2050 is 2 billion people. According to this, it can be concluded that the birth rate is higher than the death rate because the population has a growth trend, which indicates that more people are born than die.
Lo points kha lo....
What is photosynthesis?
Answer:
the process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a byproduct.
Answer:
1
Explanation:
is the process of green plants to manufacture their own food
Skin color in a certain species of fish is inherited via a gene with four different alleles. Each allele confers a unit of color darkness such that having allele S1 confers one unit of color, S2 has two units, S3 has three units, and S4 confers four units. A fish of this type has the genotype S1, S3, and its mate has the genotype S2S4. What proportion of their offspring would be expected to have five units of color
Answer:
25% of the progeny with genotype S3S4 is expected to express 5 units of color
Explanation:
Available data:
Skin color in a certain species of fish is inherited via a gene with four different allelesallele S1 confers one unit of color, S2 has two units, S3 has three units, and S4 confers four units.Cross:
Parentals) S1 S3 x S2S4
Gametes) S1 S3 S2 S4
Punnett square) S1 S3
S2 S1S2 S2S3
S4 S1S4 S3S4
F1) 1/4 = 25% of the progeny is expected to be S1S2, expressing 3 units of color ⇒ allele S1 provides one unit, allele S2 provides two units of color
1/4 = 25% of the progeny is expected to be S2S3, expressing 5 units of color ⇒ allele S2 provides two units, allele S3 provides three units of color
1/4 = 25% of the progeny is expected to be S1S4, expressing 5 units of color ⇒ allele S1 provides one unit, allele S4 provides four units of color
1/4 = 25% of the progeny is expected to be S3S4, expressing 7 units of color ⇒ allele S3 provides three units, allele S4 provides four units of color
25% of the progeny with genotype S3S4 is expected to express 5 units of color
The place where photosynthesis occurs is the:
A. mitochondrial membranes.
B. thylakoid membrane.
C. plasma membrane.
D. ribosone.
it's not chloroplast.
Answer:
B
Explanation:
it's thylakoid membrane
Answer:
Thylakoid membrane.
Explanation:
Hope this helps!
which of the following solutions has the hghers h ion concentration
a slow-moving stream has many plants growing in it. changes to the climate makes the water in the strem move much faster. what is the most likely effect of this change?
A. the stream will turn into a bog.
B. the stream will have fewer plants growing.
C. the stream will become more stagnant.
D. the stream will become more productive.
Answer:
B. the stream will have fewer plants growing.
Explanation:
“Do you get wetter by walking or
running in the rain"? Given this question, what hypothesis do you have?
How many phenotypes are possible from the 3 alleles coding for human blood? A 3 B. 4 C. 5 D. 6
There are 4 phenotypes are possible from the 3 alleles coding for human blood. The correct option is B.
What is phenotype?The set of qualities or characteristics that can be observed in an organism are known as its phenotype in genetics.
The word includes an organism's anatomy, developmental processes, physiological and biochemical characteristics, behaviour, and the outcomes of behaviour.
The genotype of an individual is their own DNA pattern. More specifically, the two alleles a person acquired for a particular gene are referred to by this phrase.
The clinical presentation of a patient is the observable expression of this genotype, or phenotype.
A, B, AB, and O are the four phenotypes of blood that can occur. The gene that determines blood type has three alleles. Six distinct genotypes are possible because there are three different alleles.
Thus, the correct option is B.
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Important steps in sequencing pure proteins include all of these except: a. Determining the amino acids on the ends of the smaller peptides b. Determining the isoionic pH of the protein c. Determining the amino acids on the ends of the protein d. Breaking the protein into smaller peptides e. Determining the amino acid composition
Answer:
b. Determining the isoionic pH of the protein
Explanation:
The sequencing of pure proteins is nothing more than the analysis of the amino acids present in isolated proteins. This analysis is composed by the study of the sequence that the amino acids assume within the protein, the amino acids present in the extremities and the constitution of each one of these amino acids. In summary, we can state that protein sequencing refers to the constitution of these proteins. In this case, the isotonic pH of these proteins is not relevant information.
Si una población crece mucho otra vez después de un cuello de botella con el paso del tiempo aumentará diversidad genética ¿por qué?
Answer:
los mecanismos capaces de generar diversidad actúan para incrementar la variabilidad genética en la población que sufrió el cuello de botella
Explanation:
Un cuello de botella se refiere a una reducción drástica en el tamaño de una población (por ejemplo, debido a una catástrofe natural). Un cuello de botella es un fenómeno que está asociado a la reducción en la variación genética y fijación de ciertos alelos en la población resultante, lo cual es causado por la deriva genética, es decir, debido al muestreo al azar de los individuos que formarán la población en la siguiente generación. Paulatinamente, los mecanismos capaces de generar variabilidad genética aumentarán nuevamente la diversidad de la población que sufrió el cuello de botella. En una población de reproducción sexual, la variación genética se genera mediante cuatro procesos diferentes: 1-mutación (es decir, la aparición de nuevos alelos debido a alteraciones en la secuencia de ADN); 2-recombinación (es decir, el intercambio de información genética entre cromátidas no hermanas durante la meiosis); 3-segregación independiente de cromosomas durante la meiosis (capaz de producir nuevas combinaciones de alelos) y 4-fertilización al azar (lo cual también incrementa el número de combinaciones entre gametos que darán lugar a un nuevo individuo).
How to predict genetic outcomes
NOT A QUIZ: 10 POINTS!
Answer:
a. (black fur): phenotype
b. (AA, Aa, aa): genotypes
c. (Aa): heterozygous
d. (aa): hom0zygous recessive
e. (AA): hom0zygous dominant
Explanation:
Does cellular respiration follow the law of conservation of energy?
Yes. Every chemical reaction obeys the law of conservation of mass.
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The structure of the cell membrane was discovered in 1895 by _________. Finding a similarity to Olive Oil, he discovers membranes are made of __________.
A. Charles Overton, amino acids
B. Gorter and Grendel, amino acids
C. Charles Overton, lipids
D. Irving Langmuir, lipids
The structure of the cell membrane was discovered in 1895 by Charles Overton . Finding a similarity to Olive Oil, he discovers membranes are made of lipids. Thus option C is correct.
What is cell membrane structure ?The cell membrane is primarily composed of a mix of proteins maintain the chemical climate of cell and lipids provide flexibility to membrane.
In lipid bilayer, phospholipids are the major component has hydrophilic head face to the aqueous cytosol and the extracellular fluid, where hydrophobic tail areas face opposite to cytosol.
Other types of lipid like cholesterol selectively dispersed in animal cell membranes.
Glycolipids present on the surface of cell membrane bind with a sugar chain , it help in recognition of other cells.
Major types of membrane proteins are peripheral membrane proteins exposed to exterior and Integral membrane proteins are present inside the membrane, some portion are transmembrane proteins are present on both sides.
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Define Aerobic
Thank you! :)
Answer:
Aerobics is a type of physical activity that combines rhythmic aerobic exercise with stretching and strength training exercises to improve overall fitness.
~OAmalOHopeO
1.scientist solve problem in an organised way called ________
2.amoeba move or feed with ________
3.nucleus was first discovered by ________
4. creation of the something new called _______
5. longest cell is________
Answer:
1. Scientific method
2. pseudopods
3. In 1909, Ernest Rutherford’s
4. innovation
5. nerve cell
the difference between the cellular make-up of a living organism and an aluminum cari is the ___
Answer:
The difference between the cellular make - up of a living organism and aluminum can is the ability to use energy .
An example of a density-independent factor that affects a population's growth is Select one: a. insects eating your tomato plants. b. your tomato plants competing for water. c. a fungus infecting your tomato plants. d. frost killing all of your tomato plants. e. All answers are correct.
Answer:
The correct answer is - D. frost killing all of your tomato plants.
Explanation:
Density independent factors are the factors that are limiting factor that are affects the size of population of the living beings without being affected by density of population. In such factors density of population does not play any role or affect the size of population.
In the given option other than frost all are density dependent factors affecting size of population.
what carbon compound stores energy for the cell and sometimes provides structural support
Answer:
Carbohydrates
Explanation:
Carbohydrates are a group of macromolecules that are a vital energy source for the cell, provide structural support to many organisms, and can be found on the surface of the cell as receptors or for cell recognition.
Answer:
Carbohydrates
Explanation:
How does Earth's internal structure contribute to its magnetic field?
A. The inner core is a permanent magnet made of iron, and the liquid
iron in the outer core aligns with that magnet's magnetic field.
B. Convection currents in the core generate a magnetic field, which is
strengthened by convection currents in the mantle.
C. The crust becomes magnetic because of radiation from the sun,
and the resulting magnetic field makes all of Earth's layers
magnetic
O D. Convection currents in liquid iron in the outer core generate an
electric current, which produces a magnetic field.
i think answer D( convection currents in liquid iron in the outer core generate an electric current , which produces a magnetic field)
What does red bone marrow make? HELP ASAP PLSSS
Answer:
it makes blood cells. :) have a nice day!
what is a gene ?
A. a series of amino acids
B. a segment of a dna molecule
C. a series of dna molecule
D. a segment of a protien
Give Jeason: si System is accepted by all nations in the world.
it's very practical, because it's on base 10, so conversion between stuff like meters to kilometer is always just a multiplication with 10 to some power
like 1 km = 1000m (10³m)
or 1 m = 10^-3km = 0.001km
same reason for other SI units.
except time, that's base 60, or 12, or 24. that's more complicated, but there isn't any real competition
Write note on pearl formation
Answer:
A pearl is a hard, glistening object produced within the soft tissue (specifically the mantle) of a living shelled mollusk or another animal, such as fossil conulariids. Just like the shell of a mollusk, a pearl is composed of calcium carbonate (mainly aragonite or a mixture of aragonite and calcite)[3] in minute crystalline form, which has deposited in concentric layers. The ideal pearl is perfectly round and smooth, but many other shapes, known as baroque pearls, can occur. The finest quality of natural pearls have been highly valued as gemstones and objects of beauty for many centuries. Because of this, pearl has become a metaphor for something rare, fine, admirable and valuable.
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Why are coral reefs important to ocean life? Coral reefs take carbon dioxide out of the water and secrete it into their skeletons. Corals provide an important cleaning function by filtering debris from the water. Corals are an important link in the benthic food chain. Coral reefs provide food, shelter, and breeding grounds for thousands of marine organisms. Coral reefs grow upward to near sea level, providing shallow zones for benthic organisms.
What would be the resulting polypeptide chain that is produced from the DNA template code: TACTTCAAAATC? Use the following RNA codon to amino acid table to help you figure out the resulting polypeptide. Show your steps.
Answer:
Methionine- Lysine- leucine- stop
Explanation:
This question is describing the processes of transcription and translation, which are both involved in protein synthesis. Transcription is the synthesis of a mRNA molecule from a DNA template while translation is the synthesis of a polypeptide/amino acid sequence from a mRNA template.
The following DNA molecule was given as follows; TAC TTC AAA ATC. Firstly transcription will synthesize an mRNA molecule based on complementary base pairing rule. The resulting mRNA will be: AUG AAG UUU UAG
Next, the process of translation which involves the synthesis of an amino acid sequence from mRNA. Using the genetic code will produce the following:
Methionine- Lysine- leucine- stop
A researcher is examining a sample of smooth muscle tissue under a microscope. Which of the following would correctly describe what he sees? (2 points)
Short cells with no striations and one nucleus per cell
Long cells with no striations and one nucleus per cell
Long cells with striations and no nuclei
Short cells with striations and no nuclei
Determine whether the following statement is true or false. If false, select the choice that will make it true. "Aerobic respiration produces Glucose."
A. True
B. False, it produces proteins.
C. False, it breaks ATP into ADP.
D. False, it produces ATP.
Answer:
D. False, it produces ATP
The statement "Aerobic respiration produces Glucose" is false. This is because it produces ATP. Thus, the correct option is D.
What is Aerobic respiration?Aerobic respiration may be defined as a chemical process in which oxygen is utilized in order to construct energy from carbon dioxide and water. This type of respiration typically takes place in the presence of oxygen to catalyze a given set of reactions.
Aerobic respiration occurs in presence of water. It takes place with help of glucose further convert into pyruvate to derive carbon dioxide, water, and energy in form of ATP. The process of aerobic respiration is also known as oxidative metabolism and cell respiration. In this process, glucose reacts with oxygen to form ATP.
Therefore, the statement "Aerobic respiration produces Glucose" is false. This is because it produces ATP along with carbon dioxide and water. Thus, the correct option is D.
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what are the two characteristics of Pine due to which it is not placed under sub division angiosperms
Answer:
The angiosperms, or flowering plants, are the largest and most species-rich phylum of plants, with more than 250,000 species estimated.
Defining Characteristics
The term "angiosperm" derives from two Greek words: angeion, meaning "vessel," and sperma, meaning "seed." The angiosperms are those plants whose seeds develop within a surrounding layer of plant tissue, called the carpel, with seeds attached around the margins. This arrangement is easily seen by slicing into a tomato, for example. Collectively, carpels together with the style and stigma are termed the ovary, and these plus associated structures develop into the mature
Explanation:
