Answer: “The first living things on Earth, single-celled micro-organisms or microbes lacking a cell nucleus or cell membrane known as prokaryotes, seem to have first appeared on Earth almost four billion years ago, just a few hundred million years after the formation of the Earth itself.”
Explanation: Hopefully this helped! :D
An open jar of tea which exchanges both energy and matter with its surroundings is an example of what type of system?
Answer:
An open system can exchange both energy and matter with its surroundings. The stovetop example would be an open system, because heat and water vapor can be lost to the air. A closed system, on the other hand, can exchange only energy with its surroundings, not matter.
Explanation:
Which activity would be within the field of biology
Answer:
B, measuring the rate of squirrel births in a woodland habitat.
Explanation:
Biology is the study of life so anything that's considered living would be around this field.
Answer:
Explanation:
B measuring the rate of squirrel births in a woodland habitat
Phenylalanine is required for the production of many bodily proteins, but none of your cells are capable of synthesizing this essential amino acid. What type of metabolic pathway must be responsible for providing phenylalanine to your cells? How would your diet effect the mount of Phenylalanine that is available?
Answer and explanation:
Phenylalanine is an amino acid that is very important for our bodies to function correctly but it isn't synthesized in our cells, so the only way to incorporate it is by having it in our diets, this is why phenylalanine is an essential amino acid.
Phenylalanine can be found in milk, eggs, chicken, and liver, among other foods known to be good protein sources. Given the fact that phenylalanine is an essential amino acid, the amount we ingest of it in our diet will directly impact on the availability of this amino acid in our body.
Phenylalanine is an amino acid and, as such, it will enter the metabolic pathway of protein catabolism, where it will be degraded to be fully usable for the body. Phenylalanine will be metabolized into acetoacetic acid and fumaric acid, and is the precursor of catecholamines such as epinephrine and norepinephrine, while also being part of the structure of several neuropeptides.
Why must the bonds of these molecules be broken before anything else happens?
Answer:
Synthesis releases energy because the molecules bond to form a stable configuration and therefore give up energy. The bonded molecules have a lower energy level than free molecules and are held in the new bond.
Explanation:
Chemical reactions make and break the chemical bonds between molecules, resulting in new materials as the products of the chemical reaction. Chemical reactions can occur spontaneously or require an outside trigger such as an input of energy. Breaking chemical bonds absorbs energy, while making new bonds releases energy, with the overall chemical reaction being endothermic or exothermic.
Because molecules must link together to establish a stable structure, they lose energy during synthesis. The newly formed bond holds the bonded molecules, which are at a lower energy level than free molecules.
Why the bonds of molecules are broken?Because molecules must link together to establish a stable structure, they lose energy during synthesis. The newly formed bond holds the bonded molecules, which are at a lower energy level than free molecules.
Chemical reactions create and destroy the chemical bonds that hold molecules together, creating new materials as their end product. Chemical reactions can start on their own or need an outside trigger, like an energy input. Chemical reactions can be endothermic or exothermic in that breaking chemical bonds takes energy while creating new ones releases it.
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Arrange the cells in order from least specialized to most specialized.
Answer:
What are the cells?
Explanation:
1) Cells of a Zygote
2) Cells of Blastocyst
3) Cells of Mesoderm
4) Cells of Heart
Which best describes a difference between transcription and DNA
replication?
A. Only transcription happens in the nucleus.
B. Transcription does not require DNA.
C. DNA replication uses thymine.
D. DNA replication takes place in the ribosome.
Answer:
DNA replication is the process of making new copies of DNA. Transcription is the process by which DNA is copied (transcribed) to RNA.
Explanation:
The best option that describes a difference between transcription and DNA replication is B: Transcription does not require DNA.
What is DNA transcription?Transcription is the process in which genetic information in DNA is used to produce RNA molecules, which can then be used to synthesize proteins. In this process, a segment of DNA is first transcribed into messenger RNA (mRNA) by RNA polymerase enzymes, which does not require the DNA template to be replicated.
On the other hand, DNA replication is the process in which a cell makes an identical copy of its DNA, which occurs prior to cell division. This process involves the copying of the entire DNA strand, including the use of DNA as the template to form new strands, and is carried out by specialized enzymes.
Therefore, while both transcription and DNA replication involve the copying of genetic information, they differ in their mechanisms and requirements.
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Which of the following describes an example of molecular movement across a membrane
through active transport?
O Channel proteins bind with extracellular solutes and release them inside the cell.
O Hydrocarbons enter the cell by dissolving in the lipid bilayer of the membrane.
Proton pumps move hydrogen ions out of the cell against a concentration gradient.
O Vesicles carrying waste products fuse with the membrane during endocytosis.
Hydrocarbons enter the cell by dissolving in the lipid bilayer of the membrane.
The following information should be considered;
The example of molecular movement across a membrane should be the Hydrocarbons that should enter the cell.It should be entered via dissolving the lipid bilayer.learn more: https://brainly.com/question/1979431?referrer=searchResults
which cell is the only cell in a human body that could be seen with the naked eye
what is the pH of a solution with a H+ ion concentration of 1 x 10^-4
Answer:
A logarithmic scale condenses the range of acidity to numbers that are easy to use. Consider a solution with [H + ] = 1.0 × 10 -4 M. That is a hydrogen-ion concentration that is 1000 times higher than the concentration in pure water. The pH of such a solution is 4.00, a difference of just 3 pH units.
is this physical or chemical change Using a mortar and pestle, you grind up a substance into a fine powder.
Answer:
Physical Change
Explanation:
It's a physical change because nothing is happening to the substance, you're just change the shape/form.
state the biological importance of dormancy in seeds
Answer:
Seed dormancy allows seeds to overcome periods that are unfavourable for seedling established and is therefore important for plant ecology and agriculture. Several processes are known to be involved in the induction of dormancy and in the switch from the dormant to the germinating state.
explain how enzymes increase the speed of chemical reactions
Answer: Hey! So, enzymes are classified as biological catalysts. "Catalysts" tend to lower the activation energy for chenical reactions, and the lower the activation energy for a chemical reaction, the faster the rate! So, enzymes speed up reactions by lowering activation energy
Answer:
Lowering the activation energy.
What is a job of the skeletal system?
exchange oxygen and carbon dioxide
deliver nutrients to the body
remove waste
protect organs
Answer:
The answer is that a job of the skeletal system is to protect organs. Hope this helps! :)
Explanation:
The job of the skeletal system is to protect organs, provide support for the body, facilitate movement, produce blood cells, and store and release minerals and fat.
What is the function of a skeletal system?The skeletal system is the framework of the body, consisting of bones, cartilage, and other connective tissues. It provides a strong and stable structure for the body and protects vital organs such as the brain, heart, and lungs. The skeletal system also enables movement, as it works with muscles to allow for locomotion and other bodily functions. Additionally, the skeletal system produces blood cells, stores minerals, and helps regulate the body's pH balance.
The skeletal system provides the body with structural support, and protection of internal organs, and helps in movement by serving as a site for muscle attachment. It also functions in producing blood cells, storing minerals such as calcium and phosphorus, and facilitating communication between different parts of the body through hormones.
Therefore, the correct answer is C) to protect organs.
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A scientist wants to grow human cells to use in an experiment. What should
the scientist do to grow and maintain cells in the laboratory?
A. The scientist should use a light microscope.
B. The scientist should design a model of a cell.
C. The scientist should use an electron microscope.
O D. The scientist should prepare a culture of the cells.
SUBMIT
D. The scientist should prepare a culture of the cells.
Answer:the scientists should repare a culture of the cells
Explanation:
yee
1.Which of the following is a biotic factor within the ecosystem *
• The climate in the area
• The herbivore that feed on producers
• Amount of oxygen
• Amount of sunlight
2. Which of the following contains only biotic factors? *
• Temperature, pH and rainfall
• Algae, shrimp and humidity
• Frog, climate and insect
• Ant, grass and snail
3. In all symbiotic relationships, at least one organism benefits *
• True or False?
4. Lions kill and eat animals such as zebras and wildebeasts. Jackals then scavenge on the leftover remains. The jackals benefit from the lions without harming or benefiting them in return. What type of relationship is this? *
• Mutualistic
• Parasitic
• Commensal
• Competitive
5.Clownfish make their homes among the stinging tentacles of sea anemones. The clownfish gain protection from predators while attracting prey for the anemones to eat. Why is this an example of a mutualistic relationship? *
• The clownfish benefit but the anemones are not affected
• The clownfish and anemones both benefit
• The anemones benefit but the clownfish is not affected
• The anemones are harmed by clownfish
how does water boiling on a stove represent all 3 types of heat transfer
Answer:
For example, when a pot of water is placed on the stove to boil, conduction heat warms up the pot, which then heats the water molecules inside. As these molecules heat, convection causes them to move away from the interior of the pot as they are replaced by cooler molecules.
Explanation:
Identify a food chain that consists of a producer, a primary consumer, a secondary consumer and a tertiary consumer.
Answer:
A producer consumes water and sunlight, while a primary eats the producers, while the secondary can either eat the producers and the primary consumers or just eats the primary consumers. The tertiary consumers are at the top of the food chain and can eat all of the above for a stable food source.
Proteins and cholesterol make up most of the cell membrane.
True
False
Answer:
TRUE!!!!!!!!
Explanation:
Answer:
true
Explanation:
Give one example of an invasive species that you researched or that we talked about in class. Provide the following information.
1) Name of Invasive Species
2) What problem(s) does it cause
3) Why is it so hard to remove an invasive species from a location?
Answer:
1. green crab
2. Green crab populations in New England have been associated with crashes in shellfish populations, reduced biodiversity, destruction of eelgrass beds, and declines in native crab species.
3. They spread very rapidly
Explanation: Hope this helps!
Why are sex-linked traits more common in males than in females?
a.All alleles on the X chromosome are dominant.
b.All alleles on the Y chromosome are recessive.
c.A recessive allele on the X chromosome will always produce the trait in a male.
d.Any allele on the Y chromosome will be codominant with the matching allele on the X chromosome
Answer:A
Explanation:
Sex-linked traits are more common in males than in females because all alleles on the X chromosome are dominant.
What do you mean by sex-linked traits?Sex linked describes the sex-specific patterns of inheritance and presentation when a gene mutation is present on a sex chromosome rather than a non-sex chromosome. In humans, these are termed X-linked recessive, X-linked dominant and Y-linked.
And in humans this is the X or the Y chromosomes. And so some of the more familiar sex-linked traits are hemophilia, red-green color blindness, congenital night blindness.
Sex-linked traits are characteristics that are determined by genes located on the sex chromosomes. Inheritance patterns for these traits can differ for males and females, since the X and Y chromosomes differ.
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Which of the following is an example of Active Transport?
A. Facilitated Diffusion
B. Osmosis
C. Diffusion
D. None of the Above
Answer:A
Explanation: Because it moves molecules with and across the concentration gradients
Answer:
i think its diffusion because i remember taking a test on this like 2 days ago and putting A but it said it was wrong and said it was c. so uh yuh
Explanation:
Which term best describes the result of plants and animals having more offspring than will be able to survive
Answer:
natural selection
Explanation:
This is what I found
natural selection is based on the following principles: In nature, organisms produce more offspring than are able to survive and reproduce.
Hope this helps
Answer: Overproduction.
Explanation:
Occurs when a species produces more offspring than will survive to maturity.
A patient suffering from breast cancer chooses to undergo surgery. Doctors remove the breast where the tumor is. However, doctors say that there is no guarantee the cancer will not come back. What makes it so hard to cure cancer? Check all that apply. A single diseased cell can multiply into a new tumor. Cancer cells can travel through the blood and spread into new areas. There is no research being done on possible cures. Many cancer cells multiply so fast that new tumors can form.
Answer:
The correct answers are: A single diseased cell can multiply into a new tumor; cancer cells can travel through the blood and spread into new areas; many cancer cells multiply so fast that new tumors can form.
Explanation:
Cancer is the term that groups different conditions that have all one thing in common: there's an abnormal cell growth that can potentially irradiate to other parts of the body.
A single diseased cell can develop a tumor, because this abnormal cell has the capacity to replicate so fast and, of course, transmit its abnormality to every other cell that it generates.
These abnormalities occur because there is some sort of damage in the DNA of a cell, which most of the time is detected by the body and eliminated - but when it's not, the cell quickly multiplies itself and generates a tumor. The difference between a benign tumor and cancer is that cancer can spread through the body and a benign tumor can not.
Cancer is very dangerous and potentially fatal if not treated fast because it can travel through the bloodstream or the lymphatic system and invade other organs, causing metastasis.
There's a lot of research being done on how to cure cancer, but the disparities in every different type of cancer make finding the solution much harder. Nowadays, depending on the type of cancer and the stage where the cancer is, this condition can be treated with radiotherapy, chemotherapy, or surgery.
Answer:
A, B, D
a single diseased cell can multiply into a new tumor.
cancer cells can travel through the blood and spread into new areas.
many cancer cells multiply so fast that new tumors can form.
Explanation:
source: trust me bro
Where is a suitable place for getting tested for a sexually transmitted infection (STI)?
at a clinic
at a drugstore
at home
at a friend’s house
Answer:
the answer to this is at a clinic
Explanation:
its more save there
Clinic is a suitable place for getting tested for a s exually transmitted infection (STI).
If an STI is left unchecked the problem can get worse. Many STIs can be effectively treated and those that can't be cured can often be better controlled with treatment.What is STI?S exually transmitted diseases s exually transmitted infections are generally acquired by s exual contact. The bacteria, viruses or parasites that cause s exually transmitted diseases may pass from person to person in blood, semen, or v aginal and other bodily fluids.Signs and symptoms that might indicate an STI include:
Sores or bumps on the g enitals.Painful or burning urination.Discharge from the p enis.Unusual or odorous vaginal discharge.Unusual v aginal bleeding.To know more about STIs here
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What ecological impact could a hurricane have on a stable ecosystem?
Answer:
Hurricanes generate strong winds that can completely defoliate forest canopies and cause dramatic structural changes in wooded ecosystems. Animals can either be killed by hurricanes or impacted indirectly through changes in habitat and food availability caused by high winds, storm surge, and intense rainfall.
Explanation:
Biology I need help please
Answer:
False
Explanation:
During the citric acid cycle only 1 ATP is produced
Answer:
True
Explanation:
The citric acid cycle also produces 2 ATP by substrate phosphorylation and plays an important role in the flow of carbon through the cell by supplying precursor metabolites for various biosynthetic pathways.
Which form of matter would be dissolved in the water
Answer:
solute
A simple solution is basically two substances that are evenly mixed together. One of them is called the solute and the other is the solvent. A solute is the substance to be dissolved (sugar). The solvent is the one doing the dissolving (water)
Explanation:
The membrane surrounding the cell *
A. nuclear envelope
B. plasma membrane
C. ribosome
D. endoplasmic reticulum
explain how the removal of the species changes the biodiversity in the ecosystem
Answer:
causes alteration
Explanation:
when one particular species that should perform a particular function is removed it will change the ecosystem
Which is the youngest rock shown in the diagram below?
Answer:
i think its limestone
Explanation:
