In the 1950s, Stanley Miller and Harold Urey conducted experiments in which they fired electrical sparks in the presence of a mixture of different gases. How d these experiments contribute to the theory of the origins of life on earth?
A They determined that the age of organic molecules can be measured by the half-life of isotopes
B They showed that organic molecules could be formed from materials nypothesized to be available in the Earth's early atmosphere
C They proved that organic molecules formed from the accumulation of debris from space
D They discovered that organic molecules would not have formed without the presence of oxygen in the atmosphere
biology spring assessment 2020-2021
Answer:
b.
Explanation:
They showed that organic molecules could be formed from materials nypothesized to be available in the Earth's early atmosphere.
What is Stanley miller and Harold Urey?The Miller-Urey experiment tested the hypothesis that life, or more precisely organic molecules, might have arisen by nothing more than straightforward chemical processes by simulating the conditions on the early Earth.
Miller's result confirmed A.I. Oparin's theoretical hypotheses, and it is regarded as the standard experiment looking into the hypothesis of abiogenesis.
The Miller-Urey experiment was the first attempt to investigate theories regarding the beginning of life experimentally. Stanley Miller recreated circumstances that were supposedly typical on the early Earth.
Therefore, They showed that organic molecules could be formed from materials nypothesized to be available in the Earth's early atmosphere.
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Over 1 million species of animals have been named and described by biologists. These species arose __________. View Available Hint(s) Over 1 million species of animals have been named and described by biologists. These species arose __________. before the Cambrian explosion through years of evolution as natural selection shaped animal adaptations to Earth's environments from island-bound populations of individuals as a result of evolution from a common fungal ancestor
Answer:
through years of evolution as natural selection shaped animal adaptations to Earth's environments.
Explanation:
Over the years, biologists have been able to successfully name more than one (1) million animal species across the world. These species arose through years of evolution as natural selection shaped animal adaptations to Earth's environments.
Natural selection can be defined as a biological process in which species of living organisms having certain traits that enable them to adapt to environmental factors such as predators, competition for food, climate change, sex mates, etc., tend to survive and reproduce, as well as passing on their genes to subsequent generations.
Simply stated, natural selection entails the survival of the fittest. Therefore, the species that are able to adapt to the environment will increase in number while the ones who can't adapt will die and go into extinction.
The second main category of mutations are "gene mutations.
Give the 3 types of gene mutations.
Answer:
substitutions
deletions
insertions
Answer:
There are three types of DNA Mutations: base substitutions, deletions and insertions. Single base substitutions are called point mutations, recall the point mutation Glu -----> Val which causes sickle-cell disease. Point mutations are the most common type of mutation and there are two types.
Explanation:
pls mark me brainlestWhich of the following can
conserve energy?
A. crop rotation
B. intercropping
C. drip irrigation
D. recycling newspaper
Answer:
jbbbbbbbbbbb
Explanation:
jjjjjjjjjjjjj
Answer:
B i think
Explanation:
Large ecosystems always have higher biodiversity than smaller ecosystems.
True or False?
Which type of birds do you think survive the drought finches big breaks or finches with small beaks?
Answer:
Since large and hard seeds survived the drought, that means that finches with large beaks survived the drought. Finches with small beaks would not be able to eat the large seeds and would not survive.
Meiosis produces four nuclei that have different chromosome numbers
from the parent cell.
True or False
Help please
Answer:
I would say true
Explanation:
they do produce 4 different chromosomes
Answer:
true
Explanation:
the are 23 chromosomes in the daughter cell and 46 in the parent cell
Suggest two reasons why a person aged 16–49 years might not be using contraception.
Answer and Explanation:
The people within this age range most likely want a baby for themselves/want more babies, or they don't feel like they should have to be limited to the amount of babies they want. Since it is their life and their bodies, they think it is up to them to decide how many to have and whether to have one or not.
#teamtrees #PAW (Plant And Water)
Fill in the chart to compare asexual reproduction with sexual reproduction.
Answer: one parent, identical
one parent, different
Explanation:
Asexual reproduction involves a single parent parent who undergoes cell division and produces multiple identical offsprings. The asexual reproduction occurs in single celled organisms like yeast, amoeba, bacteria, and others. Sexual reproduction is a process in which two parents are involved which undergoes gamete formation. In sexual reproduction cell division occurs in both parents individually in the germ cells to produce the gametes the egg in female and sperm in male. When the fusion of egg and sperm occurs the organism so produced after development of fusion product that is zygote is different from both parents genetically and morphologically. Sexual reproduction can occur in both single celled (bacteria) and multicellular organisms (angiosperms, humans).
What might happen to an enzymes activity if the gene encoding its production was altered by a mutation?
Answer:
The enzyme's activity will be altered
Explanation:
Genes are unit of hereditary that carries genetic information needed for the survival of the cell and organism at large. Genes are expressed via transcription and translation processes to produce a protein, which is responsible for the physical traits we can see (phenotype).
Since ENZYMES that catalyze biochemical reactions in living cells are proteinous in nature i.e. are made up of proteins, this means that they are formed from the expression of genes. Hence, if the gene encoding the production of an enzyme is altered or changed due to mutation, then the activity of the resulting enzyme will also be altered (most times non-functional).
39
What did Darwin's analogy of the tree of life suggest? *
(2 Points)
Answer:
all species were derived from ancestral group
what is the function of the cristae that is found inside the mitochondria
Answer: cristae greatly increase the surface area of the inner membrane on which the above-mentioned reactions may take place. A widely accepted hypothesis for the function of the cristae is that the high surface area allows an increased capacity for ATP
Explanation:
What type of scientists uses a dichotomous key?
Answer: biologists are a type of scientist that use dichotomous.
The Type of scientists that uses dichotomous key is : Biologist
A lot of scientists make use of the Dichotomous key for identifying unknown biological organisms like Biologists. A dichotomous key consists of a set of choices, with each choice consisting of two statements, these statements makes it possible to name an unknown biological organism.
A dichotomous key is a simply method used for the identification of organisms ( groups of unknown organisms are repeatedly divided into two groups to get more information about the organism )
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ASAP Becky made the diagram below to represent ultraviolet rays, radio waves, gamma rays, and infrared rays based on their properties.
Four waves labeled A, B, C, and D are shown. Wave A has the greatest gap between its consecutive peaks and Wave B has the least gap between its consecutive peaks. Wave C has the second greatest gap between consecutive peaks, followed by Wave D.
Which wave best represents ultraviolet rays?
Wave A
Wave B
Wave C
Wave D
The best wave represents ultraviolet rays is Wave B.
Ultraviolet (UV) radiation is a type of non-ionizing radiation that is emitted by the sun and unnatural sources, such as tanning .
How harmful are UV rays?Exposure to UV rays can cause early ageing of the skin and signs of sun harm such as creases , leathery skin, liver bumps, actinic keratosis, and solar elastosis.
UV beams can also generate eye pains. They can force the cornea to become inflamed or ignited.\
Thus, the option "B" is correct, Ultraviolet (UV) radiation is a type of non-ionizing radiation that is emitted by the sun and unnatural sources, such as tanning .
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Answer:
b
Explanation:
Photosynthesis
Leaves helps to make
for a plant. They contain a
green substance called chlorophyll The leaves take in a gas called
The roots take in
and other substances from the
ground
The
changes the water and carbon dioxide into the
food that the plant needs. This food is a kind of sugar called
This whole process of making food is called
While this is happening the leaves give off a gas called
Word's to choose from: oxygen, carbon dioxide, photosynthesis,
water, food, chlorophyll, glucose
Complete the word equation for photosynthesis
sunlight
Answer:
1. Food
2. Carbon Dioxide
3. Water
4. Chlorophyll
5. Glucose
6. Photosynthesis
7. Oxygen
in which way does dentition of sheep differ from that of humans ?
sheep has diastema while humans have complete set of teeth
what’s the code for UCU AAA CCU GGG UAA
When a substances like sugar, salt or lemon juice dissolve into a liquid and appears to "disappear", it is no longer present in the solution.
True
False
Answer:
False.
Explanation:
A solvent is the substance that does the dissolving – it dissolves the solute. In salt solution, water is the solvent. During dissolving, particles of solvent collide with particles of solute. They surround the particles of solute, gradually moving them away until the particles are evenly spread through the solvent.
The molecules are still there.
As the season changes from fall to winter, you can observe many warm-blooded animals increasing in body size. This increase in body fat is preparing animals for —
Question 7 options:
migration, where large animals tend to survive better.
reproduction, where large bodies attract more mates.
raising infants, where a large amount of energy is needed.
hibernation, where the body fat provides a food source.
Answer:
hibernation
Explanation:
took test on k12
Pesticides sprayed on the plants in fields become
drip onto the soil.
when they settle and
O A. ammonia
O B. pollutants
C. nutrients
D. acid rain
Answer:
pollutants
Explanation:
have a nice day :)
Answer:
pollutants
Explanation:
how much of the sun's energy is Absorbed by earth
the answer is C 51 percent
Oxygen is
a product of photosynthesis and cellular respiration.
a reactant of photosynthesis and cellular respiration.
a product of photosynthesis and a reactant of cellular respiration.
a reactant of photosynthesis and a product of cellular respiration.
Answer:
a product of photosynthesis and a reactant of cellular respiration
1. A one-eyed purple people eater is crossed with a two eyed purple people eater. All of their offspring have two eyes. A. Which trait is dominant? B. If you use the letter E for this gene. What is the genotype of the offspring? C. Are these offspring the F1 or F2 generation? D. If you crossed the offspring with each other? How many of the new offspring would you expect to have two eyes?
Answer:
The dominant trait is two-eyesThe offspring genotype must be heterozygous EeThis offspring represents the F13/4 or 75% of the F2 generation should have two eyes.Explanation:
Due to technical problems, you will find the complete answer and explanation in the attached files
uhmm......... i think im slow..
Answer:
chlorophyll
Explanation:
So B! Hope this helps! Plz mark as brainliest! :)
Answer please I will give points
Answer:
A
//this msg was written as I needed more words//
Answer:
The answer is a
Explanation:
The answer is a because it ball a can't rollout a flat surface unless gravity pulls on ball A
Part D The result of the following cross indicates that the genotype of the female parent is _____. A cross of a female parent with a wild type head top and a male parent with a flat head top (P generation). The F1 generation all have a wild type of the head top. The result of the following cross indicates that the genotype of the female parent is _____. A cross of a female parent with a wild type head top and a male parent with a flat head top (P generation). The F1 generation all have a wild type of the head top. R rr Rr r RR
Answer and Explanation:
Due to technical problems, you will find the complete answer and explanation in the attached files
can someone please double-check these for me?????
Answer:
7. Recessive
8. Recessive
9. Dominant
10. Dominant
11.Dominant
12. Dominant
Explanation:
In genetics, an allele can be dominant or recessive; if there is complete dominance then the dominant allele will always be represented in the phenotype. The genotype of a person is two letters, either upper or lowercase, that represent the alleles an organism has for a certain trait. Uppercase alleles are dominant, while lowercase is recessive. So all of the lowercase letters should be recessive and all of the uppercase should be dominant.
How did Hooke’s work contribute to the cell theory?
the united states , canada , japan , and england are all examples of ?
1. developed nations
2. developing nations
3. low-income nations
4. middle-income nations
5. transitional nations
What type of wave is light? And does it need a medium to travel through?
Answer: light is a eletromagnetic wave, no it does not need a medium
Explanation:
have a good day lad :)
Answer:
light arent a specific "type" of wave, but it refers to any wave/wavelength in the electromagnetic spectrum
and yes, it needs a medium, just like sound waves