describe dwarf planets and their orbits in the solar system
Assume you began with 10 g of a radioactive parent isotope. How many grams of parent isotope will be present in the sample after 2 half-lives?
Answer:
2.5 grams
Explanation:
In radioactive decay, one half-life is the time it takes for half of the radioactive sample to decay. So if it takes two hours (for example) for a sample to go from 8 grams to 4 grams, then one half-life has passed (since half the sample has decayed), and the half-life is two hours.
Calculation:
2 half-lives = sample halved twice
10 grams / 2 = 5 grams (one half-life has passed)
5 grams / 2 = 2.5 grams (two half-lives have passed)
if one centromere on each chromosome is needed for proper cell division, what would you expect to happen to cells that have the products with 2 centromere
Ciliates have complex internal structures involved in different functional systems. Which organelles aid in their digestion process?
Select all of the following that are true about Mediterranean climate: has wet winters and dry summers is nearer to the equator than tropical areas plants have adapted to extreme rainfall differences is found in southern California
Answer:
Explanation:
It has wet winters, dry summer
Is found in Southern California
Plants have adapted to extreme rainfall differences.
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human insulin has 50 amino acid in its protein sequence. The segment of DNA that codes for the 51 amino acids in insulin has..
A) 17 nucleotides
B) 50 nucleotides
C)100 nucleotides
D)150 nucleotides
Answer: Option D; 150 Nucleotides
Amino acids have their codons in form of set of three nucleotides. So if there are 51 amino acids, it means the number of nucleotides would be -
1 amino acid = 3 bases/ nucleotides
51 amino acids = 51 * 3 = 153 nucleotides
Since the nearest answer is 150, option D is the correct answer.
This is the basic concept of relation between DNA and protein synthesis.
Slow, gentle slope with shallow water and animals
A continental slope
B-mid ocean ridge
C-abyssal pain
D-continental shelf
E-ocean trench
I believe the answer is A.
Which of these environmental changes occurs most rapidly?
A.) Forest Succesion
B.) Human Population Growth
C.) Decomposition
D.) Tornado
The environmental change that occurs most rapidly among the options listed is human population growth (Option B).
What are environmental changes?Environmental changes refer to alterations in the natural world caused by a variety of factors, including natural forces and human activities. Environmental changes can be gradual or rapid, short-term or long-term, and can affect both living organisms and non-living things.
While the other options - forest succession, decomposition, and tornado - can occur relatively quickly in their own right, they are typically on a much shorter timescale compared to the exponential growth of human populations.
Human population growth has the potential to lead to significant environmental impacts, such as increased resource consumption, habitat destruction, and pollution, among others.
Therefore, it is essential to manage human population growth in a sustainable way to ensure the long-term health and wellbeing of both humans and the planet.
Environmental changes can have significant consequences for both human populations and natural ecosystems. They can lead to the extinction of species, increased frequency and severity of natural disasters, changes in weather patterns, loss of biodiversity, and disruptions to food and water supplies.
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Name the two types of vectors.
Two types of vectors are Biological and Mechanical.
Vectors are important agents for cloning in biotechnology. Plasmids and bacteriophages are the two types of vectors.
What are vectors?Vectors are the important tools used in biotechnology for cloning the desired DNA sequence or a segment of gene in a host organisms.
Vectors are ideal for cloning as they are small in size and they have the unique ability of self-replication. Thus, they can efficiently multiply in the body of host.
Vectors also possess restriction enzymes which make them cleave at specific sites and thus it can be ideal for drug selection. Another important feature of vectors is that they do not pose any interference with the DNA of the host.
Yeast cells, bacteriophages and plasmids are the commonly used vectors in genetic engineering. Plasmids are widely used vectors isolated from bacteria. Bacterial artificial chromosomes and Yeast artificial chromosomes are also popularly used vectors for genetic modifications.
Thus, vectors are ideal and important for genetic engineering processes.
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Air that has reached its water vapor capacity is said to be _____.
Purple petal color in pea plants is dominant to white petal color. Two heterozygous pea plants are crossed. What ratio of the offspring will have white petals? : Express this in a percentage. %
Mendel crossed the dominant purple colour flowered plant with the recessive white colour flowered plant. The F 1 generation produced the heterozygous purple colour flowered (Pp) plants. When two heterozygous pea plants (Pp) are crossed in the F2 generation represented by Pp x Pp, the gametes formed are P and p. Out of the offspring produced, 3 are purple colour flowered plants and 1 is white colour flowered plant. Thus the phenotypic ratio is 3: 1 with one out of four plants being white colour flowered pea plant. When expressed in percentage it is 25%.
What should the detective do to get enough DNA? A) western blot B) DNA fingerprint C) gel electrophoresis D) polymerase chain reaction (PCR)What should the detective do to get enough DNA? A) western blot B) DNA fingerprint C) gel electrophoresis D) polymerase chain reaction (PCR)
Answer:
on usatestprep the answer D
Based on the Cuban phylogenetic tree, which of the following is the correct order of appearance of the ecomorphs on that island, from earliest to latest?
Crown-giant, trunk-ground, trunk-crown, twig
Further Explanation
The phylogenetic tree or evolutionary tree is a branching diagram or "tree" that shows the evolutionary relationship between various species of living things based on their similarities and differences in physical and/or genetic characteristics. The taxon that is connected to the tree is inherited from a common ancestor. The first portrayal of this tree was found among others in the book Elementary Geology from Edward Hitchcock (1840) and The Origin of Species from Charles Darwin (1859).
Evolution (in biological studies) means changes in the inherited characteristics of a population of organisms from one generation to the next. These changes are caused by a combination of three main processes: variation, reproduction, and selection. When organisms reproduce, their offspring will have new characteristics. New traits can be obtained from gene changes due to mutations or gene transfers between populations and between species. Evolution occurs when these inherited differences become more common or rare in a population.
This branch also develops and tests theories that explain the causes of evolution. The study of the fossil record and the biodiversity of living organisms has convinced scientists in the mid-19th century that species change over time. However, the mechanism driving this change remained unclear until the 1859 publication by Charles Darwin, On the Origin of Species, which explained in detail the theory of evolution through natural selection. Darwin's work was immediately followed by the acceptance of the theory of evolution in the scientific community. In 1930, Darwin's theory of natural selection was combined with Mendelian inheritance theory, forming a synthesis of modern evolution, which connected the evolutionary unit (genes) with the mechanism of evolution (natural selection). The strength of the explanation and prediction of this theory encourages research that continually raises new questions, where it has become a central principle of modern biology that provides a more comprehensive explanation of biodiversity on earth.
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Grade: Middle School
Subject: Biology
Keywords: phylogenetic, tree, evolution
Reflexes may be coordinated by the brain or by the spinal cord.
In reflexes co-ordinated by the brain, there are no relay neurones.
Suggest why there is a difference in the mean speed of the impulse for the two reflexes.
The difference in the mean speed of impulses in reflexes coordinated by the brain versus the spinal cord can be attributed to the different lengths and complexities of the nerve pathways involved. Spinal reflexes tend to be quicker due to their direct, short pathway, while cortical reflexes are slower due to their longer, more complex pathway which includes relay neurons.
Explanation:Reflexes coordinated by the spinal cord, often termed as spinal reflexes, are typically faster. This is due to the fact they involve a direct and relatively short pathway - from the sensory neuron to the spinal cord and then directly to the motor neuron.
On the other hand, reflexes coordinated by the brain, known as cortical reflexes, require the impulse to travel a longer distance - from sensory neurons, to the spinal cord, up to the brain, and back down to the motor neurons. In addition, cortical reflexes often involve relay neurons, adding more steps and complexity to the transmission process. This additional length and complexity generally leads to a slower overall speed of impulse transmission.
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Why is potassium iodide electrically neutral?
which process is related to crossing over and non-disjunction, mitosis or meiosis? please explain your answer quickly please and thank you.
In the darkness of the deep ocean, some organisms produce light through a process called ___________________
Answer: Bioluminescence.
Explanation:
Bioluminescence is the phenomena of production of light by living organisms.
This phenomenon is very common in deep sea oceans because at the depth of the ocean it is very dark and it helps the organisms to survive in the following ways :
1. It helps to attract prey.
2. It helps to confuse the predator.
3. To camouflage.
4. For communication.
5. To generate warning signals.
6. For illuminating the water column.
. Which of the following are you most likely to need when recovering an escaped cat?
A. Pepper spray
B. Restraint gloves
C. A cat bag
D. A head snare
Humans usually live in houses or other buildings that protect them from environmental hazards, such as rain, snow, and extremely hot and cold temperatures. The roofs of buildings may be made from a variety of materials. Which of the following is a renewable resource that can be used to make roofs?
Answer:
wood
Explanation:
A marine ecosystem off the California coast consists of leatherback turtles that feed on jellyfish, and killer whales that prey on the leatherback turtles. Habitat loss and fishing have been identified as the main reasons for the reduced numbers of leatherback turtles, who are on the verge of being declared an endangered species. What would be the first effect on the ecosystem if habitat loss and fishing continue unchecked? A) A spurt in the population of jellyfish B) A spurt in the population of killer whales C) A change in the feeding habits of jellyfish D) A migration of jelly fish from the ecosystem
Answer:
The correct answer is A) A spurt in the population of jellyfish.
Explanation:
According to this question, habitat loss affects population of leatherback turtles so the population of the leatherback will go down and it will affect the population of killer whales because killer whales prey on leatherback turtles.
As the population of leatherback turtles decreases the population of its prey that is jelly will grow very fast due to lack of their natural predators like leatherback turtles.
So if habitat loss and fishing continue unchecked then there will be a spurt in the population of jellyfish and decrease in the population of leatherback turtles and killer whales which will disturb the balance marine ecosystem.
Therefore the correct answer is A) A spurt in the population of jellyfish.
Which of these activities would have been considered suitable for women in the Elizabethan period?
Answer:
painting , all others were no allowed for women to practice
Explanation:
PLATO users
what is the complements the section of dna modeled above 3` AATCGC 5´
Is rice a living thing or a non living thing? Please explain
Answer:
Living thing
Explanation:
Rice is the seeds of the plants whose scientific name is 'Oryza sativa' and is one of the annual crops. This crop can carry out the cellular respiration process that allows to utilize its nutrients and the cells are able to use it for energy. It also undergoes photosynthesis due to the presence of sunlight and the availability of carbon dioxide and water. It is the most consumed food in various countries.
So, rice can be considered to be a living thing.
Explain how an unbalanced translocation occurs and how it affects humans
The wage gap—the level of women’s income relative to that of men—is currently
Answer:
Edge says 75 cents but...
Explanation:
That bs in the real world
which statement describes a property of both prokaryotic and eukaryotic cells
Final answer:
Both prokaryotic and eukaryotic cells contain a cytoskeleton, plasma membrane, cytoplasm, DNA, and ribosomes. These structures are crucial for cell division, protection, shape maintenance, and protein synthesis.
Explanation:
A property shared by both prokaryotic and eukaryotic cells is the presence of a cytoskeleton. The cytoskeleton is a network of fibers that provides structural support, maintains cell shape, and facilitates cellular movement and division. Both types of cells rely on their cytoskeleton for these critical functions, although the specific structures and proteins involved may differ between prokaryotes and eukaryotes.
In addition to the cytoskeleton, all cells possess four common structures: a plasma membrane, which acts as a protective barrier; cytoplasm, a gel-like substance inside the cell where cell components reside; the genetic material, DNA; and ribosomes, which are responsible for protein synthesis. These structures are fundamental to the survival and operation of both prokaryotic and eukaryotic cells.
Look at the prey's population size at the end of the graph. How will this population size most likely change next? A. The population will shrink in size. B. The population will increase in size. C. There is no way to predict how the population size will change. D. The population size will remain the same.
b- increase in size // study island
The population will increase in size. Therefore, the correct option is option B among all the given options.
What is population?In human biology, population refers to the total population of a region (such as a nation or the entire world), which is always changing due to both gains and losses (such as births and immigrations). The availability of food, the impact of diseases, and various other environmental conditions all have an impact on the size of the human population, just like they do for any other biological species.
Social norms governing reproduction and technological advancements, particularly in medicine & public health, which have decreased mortality and increased life expectancy, have an additional impact on human populations. The population will increase in size.
Therefore, the correct option is option B.
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Calculate the mass defect for oxygen-16 given this data. Round to the 5es001-1.jpg decimal place. mass of an oxygen-16 atom: 15.994914 amu mass of a proton: 1.00728 amu mass of a neutron: 1.00866 amu mass defect = amu
Answer:
Explanation:
Given parameters:
Mass of oxygen atom = 15.994914amu
Mass of a proton = 1.00728amu
Mass of a neutron = 1.00866amu
Unknown:
Mass defect = ?
From the periodic table, the number of the elementary particles in a neutral Oxygen atom is given below:
Number of protons = 8
Number of neutrons = 8
Number of electrons = 8
Solution
The mass defect examines the difference between the actual mass of an atom and sum of masses of the nucleons.
The mass of an atom is concentrated in the nucleus which contains protons and neutrons. Electrons have little to no weight compared with the nucleons.
To calculate the mass defect, we first know the mass of the nucleons first:
1 proton has a mass of 1.00728amu
8 protons will weigh: (8 x 1.00728)amu = 8.05824amu
For the neutrons:
1 neutron has a mass of 1.00866amu
8 neutrons will weigh: (8 x 1.00866)amu = 8.06928amu
Mass of the nucleons = mass of protons + mass of neutrons
= 8.05824amu + 8.06928amu
= 16.12752amu
The mass defect = mass of the nucleons - mass of the atom
= 16.12752amu - 15.994914amu
= 0.132606amu ≅ 0.13261amu to 5 decimal places
Mass defect refers to difference between the mass of an isotope and its mass number which represents the binding energy. The mass defect for oxygen-16 in given data is 0.13261amu
What is isotope?
The element that contain equal numbers of protons but different numbers of neutrons in their nuclei is called isotope.
They differ in relative atomic mass and are same in chemical properties.
The mass defect for oxygen-16 is:
Given that
Mass of oxygen = 15.994914amuMass of a proton = 1.00728amuMass of a neutron = 1.00866amuTo find:
Mass defect = x
According to the periodic table, the number of the elementary particles in a neutral Oxygen atom is given as:
Number of protons = 8Number of neutrons = 8Number of electrons = 8The mass of an atom is summed up in the nucleus which contains protons and neutrons. Electrons have little weight.
To calculate the mass defect, the mass of the nucleons is as follows:
1 proton has a mass of 1.00728amu8 protons will weigh: (8 x 1.00728)amu = 8.05824amuFor the neutrons:
1 neutron has a mass of 1.00866amuweight of 8 neutrons will be: (8 x 1.00866)amu = 8.06928amuMass of the nucleons = mass of protons + mass of neutronsMass of the nucleons = 8.05824amu + 8.06928amuMass of the nucleons= 16.12752amuThe mass defect = nucleons mass - atomic massThe mass defect = 16.12752amu - 15.994914amuThe mass defect = 0.132606amu ≅ 0.13261amuThus, the mass defect for oxygen-16 according to given data is 0.13261amu.
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What are two causes of muscle soreness after eccentric exercise?
please help
Wind, friction, and the Coriolis effect combine to move water in which direction?
A. against the wind
B. perpendicular to the wind
C. in no particular direction
D. parallel to the wind
Wind, friction, and the Coriolis effect combine to move water in a direction that is perpendicular to the wind due to the Coriolis effect and the Earth's rotation.
Explanation:Wind, friction, and the Coriolis effect combine to move water in a specific direction. The correct answer to this question is B. Perpendicular to the wind. This is due to the Coriolis effect, which makes moving objects veer to the side because of the Earth's rotation. The combination of the wind (which pushes the water), the Coriolis effect (which turns the water to the side), and friction (which slows the water) creates a net movement of the water perpendicular to the wind's direction.
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