Which radioactive isotope would you use to date a 4-billion-year-old piece of granite?
A . Carbon - 14 dating
B . Uranium- 238 - lead 206 dating
C .potassium - argon dating
Explanation:
Uranium- 238 - lead 206 dating
Explain two ways in which mitosis is biological significant
Mitosis is a way of making more cells that are genetically the same as the parent cell. It plays an important part in the development of embryos, and it is important for the growth and development of our bodies as well. Mitosis produces new cells, and replaces cells that are old, lost or damaged.
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Consider the formula for glucose C6H 1206 .in the process of photosynthesis what supplies the hydrogen used in the formation of glucose
Answer:
Explanation:
H2o
During Meselson and Stahl’s experiment, E. coli was grown on heavy nitrogen for what purpose?
A. So each generation of DNA would have a different weight to distinguish them by.
B. To determine how the bacteria functioned with a heavier element.
C. To see how the heavy nitrogen affected their DNA.
D. So each generation of protein would have a different weight to distinguish them by.
Answer:
D. So each generation of DNA would have a different weight to distinguish them by.
I took the test
Meselson and Stahl performed an experiment to find out the semiconservative property of DNA and to differentiate the DNA weight of alternative generation both scientists used heavy nitrogen. Thus option A is correct.
What is the semiconservative property of DNA?When a double-stranded DNA undergoes replication, it results in the formation of 2 double-stranded DNAs and each newly formed DNA has one parental DNA strand and one new DNA strand and this is the semiconservative property of DNA.
Heavy nitrogen of media will appear in the newly synthesized DNA strand so each generation of DNA would have a different weight . So option A is correct.
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What happens with the release of DDT into the food chain zooplankton -- small animal -- large animal-- bald eagle? And what process is involved
Answer: The process involved is called BIOACCUMULATION.
Explanation:
Dichlorodiphenyltrichloroethane (DDT) is a type of pesticide used in agricultural control of pests. It's use has been restricted because of its involvement in bioaccumulation. The pesticide is known for accumulating in food webs and persisting in soil and river sediments. This leads to it's accumulation (build up) in living organisms.
Pesticides and fertilizers are used in crop cultivation. Rain and irrigation water wash these chemicals, especially the soluble nitrate fertilizers, into the ground water and they eventually get into rivers, lakes and seas.
These pesticides such as DDT are synthetic organic compounds that are non-biodegradable. When they are washed into the ground water, they accumulate in the bodies of plants (zooplankton). These are eaten by small fishes which are in turn consumed by larger fishes. These large fishes are hunted as prey by the bald eagle.
DDT builds up in these bald eagle causing them to lay eggs with thin shells. As a result, the eggs break easily causing a fall in the eagle population.
what do you mean by components of mixture?
Answer:
The components of a mixture are the items that are mixed together.
8. How is penicillin used?
O to make cheese
O to kill protists that cause disease
O to kill bacteria that cause disease
O to make bread rise
Answer:
O to kill bacteria that cause disease
Explanation:
penicillins are a group of antibiotics used to treat a number of bacterial infections.
hope this helps!
PLS HELP ASAP 4 EXAM Which field of biology has caused
some ethical concerns?
A. biotechnology
B. ecology
C. molecular biology
D. evolution of disease
Answer:
D. evolution of disease
Explanation:
Biotechnology's growth and regulation has sparked debate in a variety of academic disciplines, including economics, law, politics, and even history. The genetic engineering of living cells, plants, animals, and humans, in particular, has raised ethical concerns.
OAmalOHopeO
What is phagocytosis?
A) how Trichoplax adhaerens processes stimuli
B) how Trichoplax adhaerens reproduces sexually
C)how Trichoplax adhaerens moves using its cilia
B)how Trichoplax adhaerens eats by engulfing its food
CAN I GET ANSWERS ASAP PLS
Answer:
D - How trichoplax adhaerens eats by engulfing it's food
Phagocytosis is a process in which Trichoplax adhaerens eats by engulfing its food, which is in Option D. It is a process by which the cells engulf the food that is coming from the outside of the cell.
What is phagocytosis?The cell has many organelles, such as the lysosome, vacuole, cell nucleus, etc., but each organelle has a special function, and one organelle cannot take over the function of another organelle. The lysosomes have a very unique and acidic environment that destroys the organelles, such as old organelles, and kills viruses, etc.
When outside food particles or pathogens enter the cell, they enter as a vacuole, and the cell transports them from the outside to the inside through a variety of processes. The cell then eats them, a process known as phagocytosis, and if it is a virus, the lysosome degrades it.
Hence, Phagocytosis is a process in which Trichoplax adhaerens eats by engulfing its food, which is in Option D.
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During starch test why is leaf boiled in ethanol?
A) to kill its Protoplasm
B) to soften it
C) to extract its chlorophyll
D) to retain its starch
Answer:
think its C cause when you boil it almost loses all its colour
What are some reasons why the control of insect pests is difficult?
Explanation:
some pesticides make them reproduce faster
The sympathetic and parasympathetic nervous systems are both part of which division of the nervous system?
the central nervous system
the peripheral nervous system
the somatic nervous system
the autonomic nervous system
Answer:
The answer is D. The autonomic nervous system.
Answer:
(D): the autonomic nervous system
Explanation:
Got it right on edge! Good Luck <3
Anthropologist have a keen interests in honey bees .why?
Answer:
But extrapolate to all the bees in a beehive and that singular moment is multiplied tens of thousands of times. ... The honey bee and flowering plants represent one of the most successful examples of mutualism in nature. Our food chain depends very heavily on the role of the bee as it pollinates.
What is the study of tissue?
the personality of an individual involves his or her
Answer:
both
Explanation:
depends on the person's personality I guess or how they act n all
When glucose is unavailable, the liver begins to break down fatty acids to supply the rest of the body with metabolic fuel. Explain why fatty acid-derived acetyl-CoA is not catabolized by the citric acid cycle but is instead diverted to ketogenesis when no glucose is available.
Answer:
Fatty acid degradation produces acetyl-CoA
When carbohydrate concentrations drop, any available oxaloacetate is diverted to gluconeogenesis to produce the glucose necessary for red blood cell and brain function. If acetyl-CoA cannot enter the citric acid cycle (and acetyl-CoA cannot be converted to pyruvate in mammals), it is converted to ketone bodies.
The Kirkwood gap is a gap with no asteroids as a result of the gravitational pull of____.
The Kirkwood gap is an asteroid belt region situated between the orbits of Mars and Jupiter that has a significant depletion of asteroids. This chasm is caused by Jupiter's gravitational pull, which causes asteroids to move around and destabilase their orbits.
What is Kirkwood gap?The Kirkwood gap is an asteroid belt region located between the planetary orbits of Mars and Jupiter that has a significant depletion of asteroids. This chasm is caused by Jupiter's gravitational pull, which causes asteroids to migrate and destabilize their orbits.
Jupiter's gravity has a major influence on the asteroid belt, causing their orbits to grow unstable and potentially crash with other objects. As a result, asteroids in some asteroid belt regions may be expelled from their orbits or smash with other things, leaving gaps or areas with fewer asteroids.
The Kirkwood gap was named after the American scientist Daniel Kirkwood, who first observed the decrease of asteroids in this region in the year 2000.
Therefore, the Kirkwood gap is an asteroid belt region situated between the orbits of Mars and Jupiter that has a significant depletion of asteroids.
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Explain the characteristics scientists use when observing organisms and placing them in the six kingdoms .
Type your answer here.
Organ/Structure
Role in Nervous System
Are the cells that make up the nervous
system. They have three main parts—a
cell body, dendrites, and an axon. These
cells form networks and communicate
with each other via a type of chain
reaction.
central nervous system
Consists of all the nerves of the body. The
nerves take information and deliver
messages to and from this system
brain
Gets messages from the PNS to the brain
and directs messages from the brain to
the intended destinations along the proper
nerve pathways.
(Score for Question 2: of 5 points)
2. Distinguish between autotrophs and heterotrophs. Provide one example of each.
The cell membrane regulates what enters and leaves the cell, only allowing
certain things to enter or exit. This is called:
A:Selective Permability
B:Homeostasis
C:Osmosis
D:Transport
Answer:
A)selective permeability
Explanation:
it allows for it to choose ,small particles easily enter and leave the cell unlike large particles
Each chromosome is like a package that contains numerous _____. Dna molecules. Traits. Genes. Cells. Help needed ASAP
Answer:
Each chromosome is like a package that contains numerous genes.
I hope this helps
Which plant is use for pine I am just in grade 5
Answer:
Pine may also refer to the lumber derived from pine trees
pine is one of the more extensively used types of wood used as lumber.
Explanation:
Which of the following structures contain the highest conc of RNA..
A) Centriole B) Lysosome
C) Chromosome D) Nucleolus
Answer:
D.) Nucleus
Explanation:
The Nucleus structure contains the highest conc of RNA..
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A specimane collection helps a scientsist do research by:
A. Asembling a large number of sample comparisons
B.providing a way to afford even the most expensive equpment
C.creating a realistic depiction of an imaginary undersea world
D.summerizing the results of an other scientists investigations
Answer A:
Explanation:
The Channel Islands are a series of small islands off the California coast. Each island has a genetically distinct population of foxes. Compare the population of foxes on one of these islands to the population of foxes in the forests of mainland California. Which is more likely to be impacted by genetic drift? Which is more likely to be at Hardy-Weinberg equilibrium?
Answer:
The fox population on the Islands experiences genetic drift whereas foxes in the forests has Hardy-Weinberg equilibrium.
Explanation:
The fox population on the Islands experiences genetic drift because there is no chance of introduction of different type of foxes in these Islands which experiences less variation in the population of already existing foxes. Genetic drift is the change that occur in the frequency of an existing gene allele in a population due to random sampling of organisms. Genetic drift may cause gene variants to disappear completely with the passage of time which leads to reduce genetic variation. The foxes that is located in the mainland forest experiences Hardy-Weinberg equilibrium.
If new genetic variation in the experimental populations arose solely by spontaneous mutations, then the most effective process for subsequently increasing the prevalence of the beneficial mutations in the population over the course of generations is
Answer:
binary fission
Explanation:
Binary fission is the main type of reproduction of prokaryotic organisms. In binary fission, the prokaryotic cell first duplicates its DNA and then divides into two cells, each one receiving one complete DNA molecule. Since binary fission is a type of asexual reproduction, this process increases the prevalence of beneficial mutations in a bacterial population. Moreover, transduction refers to the process by which a virus transfers genetic information from one bacterium to another bacterium. Conjugation is also a sexual mode of transfer of DNA from a donor (F+) to a recipient (F−) bacterial cell by direct cell-to-cell contact. Finally, transformation refers to the transfer of genetic material by which bacteria take up exogenous DNA from the environment and integrate it in their genomes.
11. Choose the best answer.
A spore is a reproductive structure that contains a haploid cell and
a food supply
a style
a protective coating
a diploid cell
a protective coating. spores do not have stored food supplies, they are a haploid cell
A scientist makes a discovery that suggests a hominid species created and used relatively sophisticated tools. The scientist decided to publish his findings. Which of the following sources would be regarded as the most reliable?
Answer: The answer is A Journal Reviewed By Peers
Explanation:
ASAP
What does the ‘fluid’ part of the Fluid Mosaic Model mean?
A. The proteins float around in the membrane as if in a fluid.
B. The lipids are suspended in a fluid.
C. The membrane creates necessary fluids for the cell.
D. It is fluid because it is adaptable to change.
Answer:
A) The proteins float
Explanation:
The proteins float around freely
An important species of an Atlantic ocean community is the giant kelp, which helps form a suitable habitat for
fish and marine invertebrates.
Which of the following best describes the role of giant kelp in its ecosystem?
Choose 1 answer:
A dominant species
A pioneer species
A foundation species
An invasive species
Answer:
The giant kelp is a foundation species in its ecosystem.
Explanation:
The kelp acts as a home to the fish and the marine invertebrates, so they can be best described as a foundation species, or species that make an ecosystem suitable for a group of other species.
Answer:
from khan academy :)
