Answer:
a
Explanation:
Chlorophyll a absorbs wavelengths from either end of the visible spectrum (blue and red), but not green. Because green is reflected or transmitted, chlorophyll appears green. Carotenoids absorb in the short-wavelength blue region, and reflect the longer yellow, red, and orange wavelengths.
As shown in detail in the absorption spectra, chlorophyll absorbs light in the red (long wavelength) and the blue (short wavelength) regions of the visible light spectrum. Green light is not absorbed but reflected, making the plant appear green. Chlorophyll is found in the chloroplasts of plants.
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Explain why stem cell research is a controversial subject. What are some of the sources for stem cells?
Answer:
Stem cell research is a controversial subject because they are human embryonic stem cell (hESC), and obtaining stem cells involves the destruction of human embryos
Explanation:
The inner cell mass of a 5 to 7-day-old blastocyst can be used to generate pluripotent stem cell lines. Human embryonic stem cell investigation, on the other hand, is morally and politically fraught since it encompasses the killing of human embryos.
What are stem cells?Stem cells are the primary raw material of the body, the cells that give rise to every other cells with specialized functions.
Under the right circumstances, stem cells differentiate to form the most cells known as daughter cells in the body or in a research lab.
Stem cells are mostly found in bone marrow. This is how they divide in order to produce new blood cells.
Once mature, blood cells end up leaving the bone marrow and reach the bloodstream. A small number of immature stem cells enter the bloodstream.
Bone Marrow has long been thought to be the best source of stem cells.
Previously, if a patient required a stem cell transplant but didn't have access to umbilical cord blood stem cells, they earned a bone marrow transplant.
Thus, this is the reason to have stem cell research as a controversial subject.
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Heather is doing an acid-base reaction. She has 25.00 mL of hydrochloric acid of unknown concentration in a flask. She wants to add a basic solution to the acid drop by drop, until all the acid has reacted.
Answer:
lwlwlelpepwpspsppa
Explanation:
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Why was the scientific method developed?
Group of answer choices
to help scientists avoid religious disputes
to help scientists organize the process of solving problems
to confirm ancient facts about the Earth
to develop scientific laws that no one could argue with
Answer:
Its B
Explanation:
It just is
mark brainliest
READING TOOL Sequence of Events List in order the parts of a typical experiment that uses
scientific methodology. Use the headings in your text as a guide.
Answer:
2. Background research
3.Create a hypothesis
4.Experiment to test the hypothesis
5.Analyse the data from the experiemnt
Explanation:
2. Learn about the topic and research on what you need for the experiment.
3.Form a hypothesis in which you want to be tested.
4. Do an experiment in which it tests your hypothesis.
5. Analyst the data from the experiment and draw conclusions and decide whether it tests your theory.
Identify the TRUE statement about fossil preservation: Group of answer choices A dead organism will most likely become a fossil if there IS abundant oxygen in the depositional environment. Low-energy environments are NOT suitable for preserving fossils. Organisms with hard parts made of shell or bone are more likely to become fossilized. The slower a dead organism is buried by sediment, the more likely it is to become a fossil.
Answer:
Organisms with hard parts made of shell or bone are more likely to be fossillized.
Explanation:
Bone/ cartilage/ shell decompose slower than other parts of organizims. If an organism is in regular fossilization conditions, then it is most likely to become a fossil.
How you complete this
Answer:
Hi. Can you type the question, it's a bit confused reading it like this thank you!.
Which of the following statements are true regarding science?
All of the above are correct
Scientists collect and organize information in a careful, orderly way, looking for patterns and
connections between events.
Scientists propose explanations that can be tested by examing evidence.
Science deals with the natural world.
Answer:
All of the above are correct
latex from _______ is the source of biodiesel
A. Jatropa
B. Tulasi
C. Neem
D. Cactus
Latex from cactus is the source of biodiesel.
2. Sam and Jerry are having a discussion in their Environmental Science lass. Sam
says that abiotic factors determine what biotic factors can be in an ecosystem. Jerry
says that biotic factors determine what abiotic factors can be in an ecosystem. Who
is correct? Use an example to support your answer. (2 points)
Answer:
Jerry is right.
Explanation:
Abiotic factors can kill biotic factors, so technically Jerry is correct, just think of it as a TDI game, let's say Chris is an Abiotic factor, and the campers are biotic factors, Chris chooses weather or not they stay.
Last electron level that has an electron in it.
Group of answer choices
Valence Level (Shell or Cloud)
Atom
Electrons
Atomic Symbol
calculate the distance covered by a school bus in 2 minutes moving with a velocity of 30m/s
explain also..
We know
[tex]\boxed{\sf Distance=Speed\times Time}[/tex]
[tex]\\ \sf\longmapsto Distance=30\times 120[/tex]
[tex]\\ \sf\longmapsto Distance=3600m=3.6km[/tex]
Why are NADH and FADH2 necessities in the electron transport chain?(1 point)
They power the electron transport chain.
They power the electron transport chain.
They remove electrons from the electron transport chain.
They remove electrons from the electron transport chain.
They move down the electron transport chain.
They move down the electron transport chain.
They move electrons to the electron transport chain.
NADH and FADH2 are necessities in the electron transport chain because they power the chain by moving electrons into it.
NADH and FADH2 are both generated at the initial stages of respiration (the Kreb's cycle), a process during which food materials are broken down to generate energy. NADH is generated from NAD+ as a result of the addition of electrons while FADH2 is generated from FAD also due to the addition of electrons.
Once generated, both compounds get transferred into the innermost membrane of the mitochondrion where they travel down the electron transport chain, donating their electrons in the process and creating an electrochemical gradient to generate ATP.
Without NADH and FADH2, there will not be electrons to power the electron transport chain and the generation of ATP would become impossible.
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Answer:
The correct answer is They move electrons to the electron transport chain.
Explanation:
just took the quick check!
hope this helps :)
Which of the following refers to the movement of biochemical and other atomic or molecular substances across biological membranes?
Membrane transport
ATP breakdown
Diffusion
Osmosis
Answer:
diffusion / osmosis passive transport does not require an input of chemical energy.
Explanation:
The chemical forces that contribute to the stability of the DNA helix are (choose the best answer):______
a) hydrogen bonds van der
b) Waals interactions
c) disulfide bonds
The forces that contribute to the stability of DNA helix are hydrogen bonds. That is option A.
Deoxyribonucleic acid (DNA) is a molecule found within nucleus of cells which contains genetic information that is used by the organism for development.
A molecule of DNA is made up of four nitrogenous bases which include:
Adenine (A), Cytosine (C), Guanine (G), andThymine (T)The DNA helix is double which is made up of two linear strands that run opposite to each other and twist.
Hydrogen bond is defined as the intermolecular force that is capable of forming a dipole-dipole attractions.
The hydrogen bond that is formed between the nitrogenous base pair helps contributes to the stability of the DNA helix.
Therefore, the forces that contribute to the stability of DNA helix are hydrogen bonds.
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In which way could the results of an experiment have bias?
A)when samples sizes are large
B)an outlier data point is present
C)when sample sizes are chosen at random
D)data that has been evaluated for accuracy
Answer:
the answer is B if anybody is wondering
Explanation:
The way in which the results of an experiment have bias is an outlier data point is present. The correct option is B.
What is an experiment?An experiment is a task performed in a hypothesis to prove the results of the experiment.
The experiment needed the required instrument, chemicals, products, etc.
Thus, the correct option is B) an outlier data point is present.
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use numbers to arrange the events of a demographic transition in order in which they occur
is this correct?
(DTM) is defined by a country's death rate dropping quickly while its birth rate staying high. Because of this, a nation in Stage 2 will show an increase in its general population—not because the birth rate is rising, but because births outnumber deaths.
What are the different events of a demographic transition?The demographic transition model was initially proposed in 1929 by demographer Warren Thompson. The four stages of the paradigm are pre-industrial, urbanizing and industrializing, mature and post-industrial.
Stage 1: Slow population growth is caused by high birth and mortality rates. Stage 2: While the birth rate stays high and the death rate declines, population growth accelerates. Stage 3: Population growth slows as the birth rate starts to decline.
Therefore, 1,4,2 and 3. It is correct events of a demographic transition in the order in which they occur.
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In a rainforest, there are trees of different sizes as shown in the figure below.
The trees in the UNDERGROWTH layer will probably face competition for which of the following resources?
a. Air
b. Water
c. Animals
d. Sunlight
What is a likely consequence of continued human population growth? A. More rain forests B. Fewer urban centers Ο Ο Ο Ο O C. Less pollution D. Depleted natural resources
Answer:
D. Depleted natural resources
Explanation:
If the human population on Earth continues to grow, depletion of natural resources is a very likely consequence.
Especially at the rapid rate that humans consume natural resources, continued population growth would eventually deplete them.
Fossil fuels are an example of natural resources that will eventually deplete, as humans use immense amounts of things like coal and natural gas.
Answer choices A, B, and C are incorrect because they would be consequences of decreased human population growth.
So, the correct answer is D. Depleted natural resources.
Which level of organization is characterized by a group of cells that work together to perform a common function?
organ
tissue
organ system
organism
Answer:
B
Explanation:
Answer:B
Explanation:
how does the energy of the reactants and products differ between an energy absorbing reaction and an energy releasing reaction
The mass of the products is larger than the concentration of the reactants in an energy absorption process.
The power of the reaction mixture is larger than the radiation of the outputs in an energy-releasing process.
As substances disrupt bonds, energy released, and then when outputs make new bonds, release energy.
Exothermic processes release energy, whereas endothermic reactions consume it. There is no general change in the quantity of energy throughout a chemical process, whether it collects or releases it.
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A pseudogene is a Group of answer choices second copy of a gene that functions when the original copy becomes damaged. gene that is unrelated in sequence to another gene but has the same function. gene that evolved by gene duplication and the acquisition of mutations to yield a gene product that has a slightly different function from that of the original gene product. gene that arose through gene duplication, but by acquiring mutations became nonfunctional.
Answer: Gene that arose through gene duplication, but by acquiring mutations became nonfunctional.
Explanation:
A gene is a functional unit of heredity formed by DNA. They possess a sequence of nitrogenous bases that during translation is read by ribosomes to produce molecules called proteins. A pseudogene is a DNA sequence that resembles a gene, but which has been inactivated in the course of evolution by mutations in its sequence. Thus, it is a gene that derives from other known genes and whose functions are different, may have lost their functionality or have radically changed it. To this day, it is not known exactly how pseudogenes are created, however some theories are as follows:
1. A gene duplication can generate two copies of a gene when only one is needed. A mutation would then occur that deactivates one of the copies. In addition, the duplication event may not be complete, so that the copy has incomplete promoters.
2. They may be fragments of the messenger RNA transcript of a gene may be spontaneously reverse transcribed and inserted into the chromosomal DNA. They lack the promoters of normal genes, so they are not expressed normally.
3. A gene may become non-functional or inactivated if such a mutation becomes fixed in the population. This can occur by normal means such as natural selection or genetic drift.
which structures in plant cells build protein molecules under the control of the nucleus?
a) cell walls
b) chloroplasts
c)mitochondria
d) ribosomes
The cell walls, chloroplasts, and mitochondria play important roles in plant cells, they are not directly involved in building protein molecules under the control of the nucleus. D
Ribosomes are the structures in plant cells that build protein molecules under the control of the nucleus.
Ribosomes are tiny, complex molecular machines composed of RNA and protein molecules.
They are involved in the process of protein synthesis, where they facilitate the translation of genetic information from the DNA in the nucleus into functional proteins.
The nucleus of a cell contains the DNA, which serves as the blueprint for building proteins.
However, the actual synthesis of proteins occurs in the cytoplasm, outside the nucleus.
Ribosomes are responsible for this task.
Ribosomes can be found both freely floating in the cytoplasm and attached to the endoplasmic reticulum (ER).
The ones attached to the ER are called rough endoplasmic reticulum (rough ER) due to the presence of ribosomes on their surface.
These ribosomes associated with the rough ER are involved in the synthesis of proteins that are destined for secretion or for integration into the cell membrane.
The process of protein synthesis involves the decoding of the genetic information stored in messenger RNA (mRNA) by ribosomes.
Ribosomes read the mRNA sequence and assemble amino acids into a growing polypeptide chain, forming a functional protein.
Cell walls provide structural support, chloroplasts are responsible for photosynthesis, and mitochondria are involved in cellular respiration. However, the primary site for protein synthesis in plant cells is the ribosomes.
Therefore, the ribosomes (option d) are the structures in plant cells that build protein molecules under the control of the nucleus.
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Communication between neurons occurs from contact between the two neurons. when the intensity of the action potential increases past a threshold. when action potentials trigger the release of neurotransmitters. because of the all-or-none response. through the selective permeability of the axon.
Answer:
The correct answer is - when action potentials trigger the release of neurotransmitters.
Explanation:
Communication between neurons takes place by signaling that can be either chemical signaling or electrical signals. Communication between neurons occurs at very small gaps known as synapses.
These synapses have two specialized cells that help two neurons communicate by one to another to allow for chemical transmission. The chemical that isreleased due to the stimulation of the action potential in order to communicate the neurons are known as neurotransmitters that allow for transmission.
What happens during S phase?
O A. Chromosomes are duplicated.
O B. DNA separates into two nuclei.
O C. The cell splits in two.
O D. Cytoplasm is manufactured.
Answer: A. Chromosomes are duplicated.
Explanation: This is the correct answer on the quiz.
Chromosomes are duplicated in S phase. Therefore, option (A) is correct.
What do you mean by S phase?
Between G1 phase and G2 phase, DNA replication takes place during S phase of the cell cycle. The processes that take place during S-phase are tightly controlled and highly conserved.
The cell replicates its genetic material entirely during the S phase of DNA synthesis; At the end of S phase, a normal diploid somatic cell with a DNA complement of 2N acquires a DNA complement of 4N.
DNA synthesis or replication occurs during the S phase of the cell cycle, which occurs prior to the interphase. Before entering mitosis or meiosis, the cell's genetic material is replicated in this manner, leaving enough DNA for daughter cells to divide.
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Does anyone know the answer for 1?
Please help me...will give braniliest
Scientists at the tar pits discovered that many of the smaller animals they extracted from the pits still exist around Los Angeles today. But many of the larger mammals-such as woolly mammoths and saber-toothed tigers-are now extinct. Why do you think this is the case? What can scientists learn about Los Angeles' climate history by studying the specimens found in these tar pits?
More than one million bones were recovered in 1906. These bones represented 231 species of vertebrates and there were 234 species of invertebrates.
Los Angeles climate is relatively stable for over 50,000 years. The fossils of more than 180 insects were preserved in La Brea Tar Pits. The climate warming probes a link for evolution of Ice Age predators.
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Answer:
scientists at the tar pits discovered that many of the smaller animals they extracted from the pis still exist around los angeles today. But many of the larger mammals such as wooly mammoths and saber toothed tigers are now extinct. I believe this is the case because since bigger beasts couldnt take shelter in small protected burrows, perhaps they were done in by fierce environmental conditons. Or maybe with so many plants dying off, big herbivores simply had nothing to eat, and as they died out, so did the big carnivores.La brea tar pits are probing the link between climate warming and the evolution of ice age predators, attempting to predict how animals will respond to climate change today.
Explanation:
What is one way private citizens can help conserve natural resources?
Answer:
By reducing their use of energy, water, and waste services
Complete the following.
1. Waste containing dangerous chemicals is ...... waste.
2. Vegetable and fruit peels and food left over comprise ... waste.
3. Hospital waste is highly ......
4. Plastic is nonbiodegradable, as it does not
5. The method of adding earthworms to compost pits is called ...
1) Waste that contains both hazardous chemicals and radioactive wastes (generally those in the LLW category) is termed 'mixed waste
2) Vegetable and fruit peels and food left over comprise biodegradable waste.Plastic is non-biodegradable, as it does not decompose
3) Hospital waste is the second most hazardous waste after radioactive waste. The improper management of hospital wastes causes serious environmental problems in terms of air, water and land pollution
4) most plastics are non-biodegradable mainly because plastic is widely used because of its low cost, versatility and durability
5) Vermicompost (vermi-compost) is the product of the decomposition process using various species of worms, usually red wigglers, white worms, and other earthworms, to create a mixture of decomposing vegetable or food waste, bedding materials, and vermicast
hope it's helpful to you
