Answer:
nucleus- this is where all genetic information is stored.
mitochondria- where respiration occurs
cell wall- gives the cell structure and prevents it from bursting
chloroplast- contain chlorophyll which stores energy from the sun for photosynthesis
cytoplasm- where chemical reactions occur
cell membrane- controls what comes in and out of the cell.
mitochondria: where respiration occurs
cell wall: gives the cell structure and prevents it from bursting
chloroplast: contain chlorophyll which stores energy from the sun for photosynthesis
cytoplasm: where chemical reactions occur
cell membrane: controls what comes in and out of the cell.
In meiosis when the cells divide again, what happens to the number of chromosomes?
5. Explain how interactions and trade with Europeans affected West Africa?
European Exploration Study Guide
Why did European countries compete for power in North America?
Economic—Gold, natural resources, and trade
Religious—Spread Christianity
Competitions for empire and belief in superiority of own culture
What were the obstacles faced by the explorers?
Poor maps and navigational tools
Disease and starvation
Fear of the unknown
Lack of adequate supplies
What were the accomplishments of the explorations?
Exchanged goods and ideas
Improved navigational tools and ships
Claimed territories
What regions of North America were explored and settled by France, England, and Spain?
Spain: Francisco Coronado claimed the Southwest of the present-day United States for Spain.
France: Samuel de Champlain established the French settlement of Québec. Robert La Salle claimed the Mississippi River Valley for France.
England: John Cabot explored eastern Canada.
What regions were explored by Portugal?
The Portuguese made voyages of discovery along the coast of West Africa.
How did the American Indians and Europeans interact with each other?
Spanish
Conquered and enslaved American Indians
Brought Christianity to the New World
Brought European diseases to American Indians
French
Established trading posts
Spread Christian religion
English
Established settlements and claimed ownership of land
Learned farming techniques from American Indians
Traded with American Indians
American Indians
Taught farming techniques to European settlers
Believed that land was to be used and shared but not owned
Which purpose does a cell membrane play in eukaryotic cells?
The cell membrane controls the movement of substances in and out of cells and organelles. In this way, it is selectively permeable to ions and organic molecules.
particles is found in the nucleus of an atom
Answer:
protons and neutrons
Explanation:
Protons and neutrons have a positive and neutral charge, respectively. They are in the nucleus, while the negative electrons orbit the nucleus.
Answer:
Protons, neutrons, electrons
Explanation:
If you're asking about subatomic particles.
a. What is the major evolutionary advantage to producing an amnion?
b. What does that mean for embryonic development for the animal phylum as compared to the animal phyla?
WHAT IS THE MAJOR EVOLUTIONARY ADVANTAGE TO PRODUCING AN AMNION?
The main evolutionary advantage of producing an amnion is that the embryos of the amniotic membrane,the amniotes are made available with their own aquatic environment,this in-turn resulted to a lesser dependence on water for it's maturation and development therefore allowing or giving room for the amniotes to branch towards environments that are drier.
WHAT FOES THAT MEAN GOR EMBRYONIC DEVELOPMENT OF THE ANIMAL PHYLUM AS COMPARED TO THE ANIMAL PHYLA?
The embryonic development of animal phylum is also known as embryogenesis.
It is the development of the embryo from the point of fertilization of an egg,(the ovum) by a sperm cell ,this makes the fertilized egg a diploid cell otherwise known as a zygote.
This zygote undergoes mitosis,a mitotic division known as cleavage and a differentiation resulting in a multicellular embryo.
This embryonic development of animal phylum comprises of 36 animal phyla.
How does Nitrogen get from the atmosphere to the soil?
Answer:
Plants get their nitrogen indirectly from the air via microorganisms in the soil and in certain plant roots.
Answer:
Microorganisms and certain plant roots in the soil
Explanation:
"Plants get the nitrogen that they need from the soil, where it's already been fixed by bacteria and archaea. Bacteria and archaea in the soil and in the roots of some plants have the ability to convert molecular nitrogen from the air (N2) to ammonia (NH3)... Such organisms are called "diazotrophs". From here, various microorganisms convert ammonia to other nitrogen compounds that are easier for plants to use. In this way, plants get their nitrogen indirectly from the air via microorganisms in the soil and in certain plant roots."
I hope this helps...
True or false consumption efficiency in Huckleberry patches is high like in a forest ecosystem
Answer:
True
Explanation:
Which type of rock does B represent?
Group of answer choices
A peptide has the sequence of Gly-Ser-Glu-Leu-Ala-His-Gly-Arg-Leu-Ala-PheCys-Leu. (pKR=4.25, 6.0, 8.2, 12.5. Assume pKa’s of amino terminus and carboxyl terminus are 9.6 and 2.3, respectively.) The PI of the peptide is close to:_______
a. 7.1
b. 7.8
c. 5.1
d. 8.2
e. 10.3
Answer:
The correct answer is option a. "7.1".
Explanation:
One easy way to determine if a peptide sequence is acidic, basic or neutral is to check for the number of amino acid residues that are acidic, basic or neutral. In this case, most amino acid residues are neutral, which mean that under neutral conditions they have a pKa close to 7.0. Particularly, the content of 3 leucine, 2 alanine and 2 glycine residues determines that the peptide have a pI of around 7.1.
Budding is a type of asexual reproduction. Which of the following is an disadvantage for asexual reproduction?
. How are mineral deposits formed around vents?
Answer:
When hot, metal-laden water spews from vents and mixes with the cold ocean, the metals precipitate. Large piles of sulfide accumulate on the seafloor and are eventually buried by sediments, modified by heat and pressure in the crust, and uplifted. Some are exposed on land when erosion removes the overlying rocks.
Help me guys!! (Giving brainliest)
Answer: C
Explanation:
C because the cell membrane is semi permeable which means only certain substances can enter and exit.
What 3 traits have led to human evolution? And why?
Answer: bipedalism, brain expansion, and culture
Explanation:
Plzzzzz help I’ll mark brainliest
Answer:
Im pretty sure its B
Explanation:
Ecology.
The definition of ecology is: the branch of biology that deals with the relations of organisms to one another and to their physical surroundings.
This means that it is the study of how organisms interact with each other and their environment.
Not sure if it's right? Let's take a look at the other answers.
Definition of biosphere: the regions of the surface, atmosphere, and hydrosphere of the earth (or analogous parts of other planets) occupied by living organisms.
Definition of biotic: relating to or resulting from living things, especially in their ecological relations.
Definition of biome: a large naturally occurring community of flora and fauna occupying a major habitat, e.g. forest or tundra.
Hope this helps!
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A strategy for fighting bacterial infections uses viruses. Viruses that infect bacteria are called bacteriophages. Phage comes from the Greek word for “eater.” Explain why it is not accurate to call a virus that kills bacteria a “bacteria eater." What happens when a virus attacks a cell?
help!!
Answer:
Viruses are not living organisms, and for that reason a bacteriophage virus does not feed on bacteria, but uses them to replicate, producing lysis of the bacterial cell in the process.
Explanation:
Viruses are structures formed by genetic material —DNA or RNA—covered by a protein envelope called the viral capsid. These structures do not perform the vital functions of a cell, so they are not considered living organisms.
A bacteriophage virus is characterized by using prokaryotic cells to replicate, destroying them in the process.
Viruses need a living cell to be able to replicate, so they introduce their viral genome into them to replace the genetic material of their nucleus and be able to multiply. They can do this:
Introducing the genetic material from outside the cell. Entering directly into the cell to be able to replicate.Bacteriophage viruses do not eat the bacteria, they simply use it to reproduce, and then happens the lysis of the bacterial cell.
Answer:
Viruses are not living organisms, and for that reason a bacteriophage virus does not feed on bacteria, but uses them to replicate, producing lysis of the bacterial cell in the process.
Explanation:
GIVING BRANLIEST HELP ME PLEASE!!!
Answer:
B I think, Good luck
Explanation:
Answer:
A: The ability to maintain homeostasis
Explanation:
Hope this helps:)
SOMEONE PLEASE HELP MEEEE you don’t have to explain just tell me if it’s true or false
Answer:
7. True
8. False
9. True
10. True
Explanation:
Let's suppose you were interested in developing drugs to prevent epigenetic changes that may contribute to cancer. What cellular proteins would be the target of your drugs?
Answer:
Potential targets:
1- DNA methyltransferases
2- Chromatin modifiers such as histone acetyltransferases, histone deacetylases, histone methyltransferases, etc.
3- Components of the RNA interference (RNAi) machinery such as Dicer, Argonaute, etc.
Explanation:
Epigenetics can be defined as the study of any heritable change in the phenotype that does not involve modifications in the DNA sequence. Epigenetic mechanisms can be classified into three major types: 1-DNA methylation, 2-histone modifications (e.g., acetylation, methylation, phosphorylation, etc), and 3-regulatory non-coding RNAs (e.g., miRNAs, lncRNAs, siRNAs, etc) that modulate target gene expression via the RNA interference pathway. There are different types of proteins that are involved in these complex epigenetic mechanisms, and those cited above represent only some examples that can be used as therapeutic targets.
help me please !!!!!!
we find ATP
like glucose and other organic compounds
In science, which of the following best describes the scientific term
theory? *
A) An educated guess
B) An idea with lots of evidence to support it
C) possible idea that needs more evidence to be real science
D) An undisputed law that will not change.
PLEASE ANSWER!!!!!!!
Answer:
here's your answer
Explanation:
b) an idea with lots of evidence to support it .
In science, the word theory refers to a comprehensive explanation of an important feature of nature that is supported by many facts gathered over time. Theories also allow scientists to make predictions about as yet unobserved phenomena.
1. Does a scientific theory ever become a law? Explain
the difference between scientific theory and law.
Answer:
a theory cannot become a law
Explanation:
the difference between a scientific theory and a scientific law because a theory is an in depth explanation of an observed phenomenon. a law is a statement about an observed phenomenon or an unifying concept (i.e.: newtons law or gravity - no explanation on how it works or what it is just that it exists.)
Which of the following processes is driven by gravity?
1.) Evaporation 2.) Condensation
3.) Precipitation 4.) Freezing
Answer:
Precipitation
Explanation:
The process which is driven by gravity is precipitation. In the process of precipitation, the clouds formed by evaporation of water drops off in the form of rain. Thus, the correct option is 3.
What is Precipitation?Precipitation is one of the main processes of water cycle. Water cycle is a biogeochemical cycle which involves the flow of water in the atmosphere through different processes such as evaporation, precipitation, and in different phases such as solids, liquids, and vapors.
Precipitation is the process of water cycle in which the clouds formed by the evaporation of water drops off back to the land in the form of rain. This process is driven by the influence of gravitational force.
Therefore, the correct option is 3.
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(Q005) Humans are unusual because our cultural practices can actually change our environmental circumstances. We can change the environment in which natural selection acts on our traits. Describe how this process has played out in the evolution of adult lactose tolerance. Describe how this process has played out in the maintenance of the sickle-cell trait. Can you hypothesize any similar situations where our future evolution may be influenced by cultural practices we have today?
Answer:
sickle cell disease or sickle cell disease is about the inheritance of metaplastic cells or cells that do not respect normal cell morphology from the mother or father to a child.
This is not associated with cultures, instead lactose tolerance is.
Explanation:
Lactose tolerance is basically an adaptation of the body in those humans who continue to drink milk throughout their lives, once the growth stage is over, milk should be suspended, although some continue to consume it and lactase continues to be encoded and expressed.
Some people for cultural reasons or environmentalist lifestyles do not drink animal milk, but rather vegetable milk.
35 points please help science biology
Euglena are unicellular organisms classified into the Kingdom Protista, and the Phylum Euglenophyte. All euglena have chloroplasts and can make their own food by photosynthesis. They are not completely autotrophic though, euglena can also absorb food from their environment; euglena usually live in quiet ponds or puddles.
Euglena move by a flagellum (plural ‚ flagella), which is a long whip-like structure that acts like a little motor. The flagellum is located on the anterior (front) end, and twirls in such a way as to pull the cell through the water. It is attached at an inward pocket called the reservoir. Color the reservoir grey and the flagellum black.
The Euglena is unique in that it is both heterotrophic (must consume food) and autotrophic (can make its own food). Chloroplasts within the euglena trap sunlight that is used for photosynthesis, and can be seen as several rod like structures throughout the cell. Color the chloroplasts green. Euglena also have an eyespot at the anterior end that detects light, it can be seen near the reservoir. This helps the euglena find bright areas to gather sunlight to make their food. Color the eyespot red.Euglena can also gain nutrients by absorbing them across their cell membrane, hence they become heterotrophic when light is not available, and they cannot photosynthesize.
The euglena has a stiff pellicle outside the cell membrane that helps it keep its shape, though the pellicle is somewhat flexible and some euglena can be observed scrunching up and moving in an inchworm type fashion. Color the pellicle blue.
In the center of the cell is the nucleus, which contains the cell's DNA and controls the cell's activities. The nucleolus can be seen within the nucleus. Color the nucleus purple, and the nucleolus pink.
The interior of the cell contains a jelly-like fluid substance called cytoplasm. Color the cytoplasm light yellow. Toward the posterior of the cell is a star-like structure: the contractile vacuole. This organelle helps the cell remove excess water, and without it the euglena could take in some much water due to osmosis that the cell would explode. Color the contractile vacuole orange.
Which of the three traits considered in this film (bipedality, extensive tool use, and large brains) were present in the 3.2-million-year-old Australopithecus fossil (Lucy)?.
Answer:
The bipedality
Explanation:
One of the things the discovered fossil signified was that human bipedality was more ancient than the large brain size because Lucy actually had a small skull which could indirectly be translated to small brain size.
NOTE: Bipedality can be described to mean the ability of an organism to move about with two legs. Hence, it must have been discovered that Lucy had two legs.
Can you think of any structures in the human body that may have once had a job but are no longer necessary?
Answer:
I bealive Vestigial organs or appendix no longer have pourpose.
Explanation:
Researchers grew populations of identical Escherichia coli (E. coli) bacteria in a growth medium that contained a low concentration of glucose and a high concentration of citrate, a substance that is not typically consumed by E. coli. For thousands of generations, the bacteria used only glucose as an energy source and grew relatively slowly and to a low density because of the low concentration of glucose. After about 30,000 generations, one population emerged that began to rapidly grow to a much higher density. The researchers hypothesized that the bacteria evolved the ability to use citrate as an energy source and referred to them as Cit . To test the hypothesis, the researchers grew separate populations of the Cit bacteria and bacteria from the original population (Cit- ) in a growth medium that contained only citrate. Describe one outcome that would demonstrate that a given population has evolved.
Answer:
The colony of bacteria is called cit positive, or cit in case these advance with colonization in media with citrate, since if they grow in number and proliferate, it means that they use citrate as a metabolite or food resource for their metabolism.
Explanation:
In case these are negative cit, the profileration would have to be null or see that the colony stagnant its growth, that is to say that they did not increase in number or even decrease their number layers and they did not replicate in media with citrate.
The colony of bacteria is named cit positive, or cit just in case these advance with colonization in media with citrate.
Since if they grow in number and proliferate, it means they use citrate as a metabolite or food resource for metabolism.
In case these are negative cit, the proliferation would have to be null or see that the colony stagnant its growth, that is to say, that they did not increase in number or maybe decrease their number layers and that they didn't replicate in media with citrate.
What about E.coli?
E. coli, a species of bacteria that lives harmlessly in every person’s gut by the billions. A typical E. coli contains about 4,000 genes (we have about 20,000). Feeding on sugar, the microbe grows till it's able to split in two.
It makes two copies of its genome, nearly always managing to supply perfect copies of the first. The single microbe splits in two, and every new E. coli receives one of the identical genomes. These two bacteria are, in other words, clones.
Therefore, E.coli grows in presence of citrate that evolved in the population of 30,000 generations.
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why it is important to reduce friction in moveable joints
Answer:
Smooth cartilage prevents friction as the bones move against one another. in freely moveable joints, the entire joint is enclosed inside a membrane filled with lubricating synovial fluid, which helps to provide extra cushioning against impact.
Which of the following is an example of a lipid?
phospholipid.
triglyceride
fats and oils.
all of these
Answer:
phospholipid
Explanation:
Phospholipids, triglycerides, fats, and oils are examples of a lipid. Therefore, option D is correct.
What are lipids?Fatty, waxy, or oily molecules are referred to as lipids. They are soluble in organic solvents but insoluble in polar solvents like water. Steroids, phospholipids, oils, and waxes are examples of lipids. They are usually referred to as fats and oils.
Since lipids may be broken down to provide significant amounts of energy, one of their primary biological purposes is the storage of energy. The structural elements of cell membranes and a number of the body's messengers and signaling molecules are also formed by lipids.
Cell membranes, cholesterol, blood cells, and the brain are just a few places where they can be found in the human body.
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What molecule, when linked
with others, creates a single link
in the DNA chain?
Answer:Figure 4: Double-stranded DNA consists of two polynucleotide chains whose nitrogenous bases are connected by hydrogen bonds.
Explanation::))))))))))))))))))))))