Answer:
Researchers have found that mitochondria and chloroplasts in eukaryotic cells have their own dna. this dna is different from the dna in a eukaryotic cell's nucleus. chloroplasts and mitochondria use their own dna and ribosomes to make some organelle-specific proteinswhat statement is best supported by this information? a. mitochondria and chloroplasts could exist outside of modern cells.b. modern cells could exist without mitochondria and chloroplasts.c. early eukaryotic cells engulfed prokaryotic cells, which later became mitochondria and chloroplasts.d. early prokaryotic cells engulfed eukaryotic cells, which later became mitochondria and chloroplasts.
Explanation:
is SARS a common virus?
Answer: SARS is not a common virus, it is a viral respiratory illness that was recognized as a global threat. it is spread through close contact. Although it is a very serious illness, it is rare to get. only eight persons were laboratory-confirmed as SARS cases.
Explanation:
You have a water plant in a test tube. You place it outdoors. At what TIME OF DAY will
the oxygen level in the tube be the LOWEST?
Why is ammonification an important process?
a) Bacteria converts ammonia into nitrites and nitrates that plants can use
b) Fungi convert nitrogen in dead plants into ammonium, which converts proteins into ammonia
c) Nitrogen is converted into a usable form through lightning fixation
d) Plant enzymes reduce nitrogen compounds into amino acids
Answer:
c
Explanation:
po ang tamang sagon po
*blank* is the branch of biology and medicine concerned with the study of embryos and their development.
Answer:
Physiology is the branch concerned with the study of embryos and their development.
How can scientists use half-life to help date new rocks and fossils that are found?
Answer:
radioactive isotopes of elements decay
Explanation:
As radioactive isotopes of elements decay, they lose their radioactivity and become a brand new element known as a daughter isotope. ... The half-lives of several radioactive isotopes are known and are used often to figure out the age of newly found fossils.
Special proteins that bind to enzymes during the cell cycle are called
a.CDK
b.Growth promoting factor
c.Cyclin
d.checkpoint
Answer:
cyclins and cyclin-dependent kinases (Cdks), are
Explanation:
I'm sorry if I'm wrong! :{
Which of the following is true of gravity?
1 it is a pulling force
2 it holds objects in orbit
3 it is a bending of space
4 it can alter the path of light
5 all of the above
Answer:
5. All of the above
Explanation:
Hope this helps!
Do Grocery stores sell toothpaste cost?
Answer:
Yes they do sell toothpaste in grocery store because toothpaste is a essential thing we use in our daily life. The cost may vary from shop to shop. So we can not tell the cost of the toothpaste accurately.
Explanation:
Answer:
english please that made no sense but yes i do believe that stores sell toothpaste
Explanation:
The action by which a fluid enters the microhematocrit tube because of the attraction between the fluid and the tube is called
The action by which a fluid enters the microhematocrit tube because of the attraction between the fluid and the tube is called capillary action.
a
A balance is best used to measure a sample's
volume
b. length
C. mass
d. size
Answer:
size
Explanation:
Which organism are part of every foodchain
Producers, also known as autotrophs, make their own food. They make up the first level of every food chain. Autotrophs are usually plants or one-celled organisms. Nearly all autotrophs use a process called photosynthesis to create “food” (a nutrient called glucose) from sunlight, carbon dioxide, and water.
Can i ask u a questions
how to get more quesBrainliest me dear :)
When comparing plant cells to animal cells, which organelle is only present in plant cells?(1 point)
mitochondrion
cell membrane
cytoplasm
cell wall
Answer:
- cell wall -
Explanation:
The answer is a cell wall because the cell wall in a plant acts as a 'skeletal system'.
So tell yourself does, an animal that already has a skeleton, need the cell wall?!
NO! It dan't! That's why animals don't have the cell walls and plants do.
!!! Hoped that helped !!!
When comparing plant cells to animal cells, cell wall is only present in plant cells. The correct option is D.
What is cell wall?A cell wall is a structural layer found just outside the cell membrane that surrounds some types of cells.
It can be tough, flexible, and rigid at times. It provides structural support and protection to the cell, as well as acting as a filtering mechanism.
The cell wall is made up of a network of cellulose microfibrils and cross-linking glycans embedded in a matrix of pectin polysaccharides that is highly cross-linked. Lignin can be found in secondary cell walls.
It provides a structural framework for plant growth and serves as the plant's first line of defense against pathogens.
The cell wall must also retain some flexibility so that it can be rapidly remodeled in response to developmental, biotic, or abiotic stimuli.
Thus, the correct option is D.
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What are the five areas that scientists use to paint the picture of how organisms are related
Answer:
Phylum.
Order.
Class.
Family.
Genus.
Species.
Scientists create models to help make sense of the natural world. Models are powerful tools that help scientists predict how things work. Models should be scientifically testable. When a model fails to predict correctly, the model must be revised or replaced. A good example of this kind of model would be one that represents an animal or plant cell as drawing to illustrate the parts of the cell.
Answer:
The answer is C, two dimensional module
Explanation:
I took the k12 test.
approximately what percentage of the human genome consists of repetitive dna or transposable elements?
Answer:
45%
Explanation:
Which structure gives you voluntary control over urination?
Answer:
d. External urethral sphincter
Explanation: is correct. post protected
I need help pleaseeeeeeee
Answer:
1. co2 and sunlight
2. glucose and oxygen
3. palisade
4.site
5. xylem and phlegm
6. stomata
7. guard cells
What did Allan Savory notice about the lands grazed by wild animals at the Africa Centre for Holistic Management
Answer:
Allan Savory noticed that grasslands co-evolved with large numbers of migrating ruminants, and therefore are co-dependent on each other's survival. These animals grouped together and constantly bunched due to the predator-prey connection, eat the grasses following the seasons throughout their migration in arid regions (Brittleness scale, of Non-Brittle to Brittle environments).
As they move, they drop nutrient-rich dung and urine, while trampling organic litter (live or dead grasses, leaves, etc) and seeds into the soil. These actions break down materials into the surface, providing more covered soil and keeping materials from chemically decomposing (oxidation, as opposed to the fast biological decomposition that occurs in areas with consistent rainfall(Non-Brittle)). The true testament to his insights of Holistic Management re: grasslands is known as the 4th Key Insight: That time, rather than numbers governs over-grazing or over-trampling.
The important component here is that the time exposed to these animals plays the significant role in whether you have healthy grasslands, not the number of animals exposed to the area of consideration. The amount of "rest" (time) for grasses between eating or trampling is just as crucial as the time in an exposure.
Explanation:
Explained in his book and courses under "Holistic Management", by Allan Savory and Jody Butterfield, and Sam Bingham
the body system responsible for filtering wastes from the blood is the:
Answer:
urinary system
Explanation:
urinary system is responsible for filtering blood ,wastes and excessive water
Does venueles carry bright red color?
Answer:
No
Explanation:
Arteries typically carry oxygenated blood, which is bright red in colour. The exception is the pulmonary artery which carries deoxygenated blood from the heart to the lungs.
Answer:
Venules carry deoxygenated blood. All blood in humans is bright red when oxygenated, but, a darker red when deoxygenated. Deoxygenated blood is darker due to the difference in shape of the red blood cell when oxygen binds to haemoglobin in the blood cell (oxygenated) versus does not bind to it (deoxygenated).
Explanation:
*sigh* its just how science do
PLEASE HELP ASAP (30 POINTS)
A sound with more vibrations per second sounds higher than a sound with fewer vibrations per second.
Question 8 options:
True
False
Answer:
true
Explanation:
organism that makes its own food
Answer:
Explanation:
autotrophs
An autotroph is an organism that can produce its own food using light, water, carbon dioxide, or other chemicals. Because autotrophs produce their own food, they are sometimes called producers. Plants are the most familiar type of autotroph, but there are many different kinds of autotrophic organisms.
Insect are classified into how many main group ?
Answer: 3 Sub classes wingless insects known as apterygota and winged insects known as pterygota
Explanation:
Which of the following is the female gamete?
Answer:
a. Ovum is correct
Explanation:
What are the three cell layers of retina, and how does the light travel to get to the receptor layer
Receptors that are especially important for helping a person maintain balance are located in the (A) gyrus cinguli (B) inner ear (C) tendons (D) ossicles (E) ligaments
The receptors that aid in allowing a person to maintain balance are located within the inner ear.
The human ability to walk upright without falling, and a wide variety of other tasks that we perform as all thanks to our ability to maintain balance. This ability is given to us by structures located deep within the inner ear.
The inner ear is located deep within the lateral side of the head. This ear contains 3 semicircular canals or ducts, which are tiny structures filled with liquid. Each of these canals has an expansion at its end known as the ampulla, which holds within it the very small cellular balance receptors called crista.
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The graph above shows the initial rate of an enzyme-catalyzed reaction at
different substrate concentrations in the presence of a constant
concentration of the enzyme.
Connect the primary structure of the enzyme to its overall shape.
The overall shape of an enzyme changes after the attachment with the substrate.
Enzymes are proteins composed of amino acids that linked together in one or more polypeptide chains. This sequence of amino acids in the form of polypeptide chain is known as the primary structure of an enzyme.
The tertiary structure is the enzyme's overall three dimensional structure, which occurs due to interactions between the R groups of the amino acids that make up the protein and the active sites of the substrate with which the enzyme can attach so we can conclude that the overall shape of an enzyme changes after the attachment with the substrate.
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The primary structure of enzymes determinies their functions and their secondary and tertiary structures. R groups remain in the center of the molecule and stabilize the structure.
--------------------------
To answer this question, we need to remember that enzymes are proteins, and hence, they share many properties. From now on, we will refer to the enzyme as proteins or molecules.
AMINO ACIDSAmino acids are organic molecules. They are composed of a central carbon, one hydrogen atom, one carboxyl group (COOH), one amine group (NH2), and one R group.
The composition of the R group is what makes them different from each other.
PROTEINS -enzymes-Proteins are amino acid polymers linearly arranged and connected by peptidic bonds. These molecules characterize by their different structures.
The peptidic bond is the union of two amino acids by their carboxyl and amine groups.
The R group of each amino acid is involved in stabilizing the molecule through their interactions.
The amount of amino acids that compose the polypeptide and their order in the chain determines the primary structure of the protein. The primary structure of the proteins determines the tertiary one.
Protein functions also depend on the aminoacids sequences. Proteins with different functions have different sequences. And among species, proteins with similar functions have similar structures.
PROTEIN STRUCTURE
The primary structure refers to the sequence in which the amino acids are arranged in the chain.
The secondary structure is the folding that the polypeptide chain adopts thanks to the formation of hydrogen bonds.
The three-dimensional structure makes them even more stable in the environment and capable of properly accomplishing their biological role.
When proteins are composed of more than one polypeptide subunit, they arrange in a fourth structure, named quaternary structure.
The hydrophilic R-groups remain in the center of the molecule, facing the protein interior, and avoiding interaction with water.
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The nitrogenous base adenice is found in all the members of which group
Answer:
ATP, RNA, NAD and DNA.
Explanation:
A nitrogenous base; it is an organic molecule containing a nitrogen, carbon and other atoms that has the chemical properties of a base that is why they are called as bases. The nitrogenous bases are; i) adenine, ii) guanine, iii) thymine, iv) uracil and v)cytosine.
Adenine is a nitrogenous base which is found in ATP, RNA. NAD, FAD and DNA. adenine pairs with thymine in DNA synthesis.
What is the importance of microtubules in cell division?(1 point)
They provide a pathway for organelles to move into the newly formed cell.
They reform the nucleus in the divided cell.
They organize and pull the chromosomes apart.
.
They start the process of cytokinesis.
Microtubules are very important in a number of cellular processes. They are involved in maintaining the structure of the cell and, together with microfilaments and intermediate filaments, they form the cytoskeleton. They also make up the internal structure of cilia and flagella.
Answer:
C) They organize and pull the chromosomes apart.
Explanation:
in the comments!
Hope this helps for all the other students looking for the answer!
Given that breaking bonds requires energy and forming bonds releases energy, explain how we know that cellular respiration releases energy overall?
Cellular respiration releases energy because the bonds in carbohydrates are broken during the reaction.
During cellular respiration, carbohydrates are broken down in a series of reactions, and the energy in the bonds is released as ATP, the energy currency of cells.
The reaction is in 3 steps:
GlycolysisKreb's cycleElectron transport chainThe summary of the reactions is represented by the equation below:
[tex]C_6H_1_2O_6 + 6O_2 ---> 6CO_2 + 6H_2O + ATP[/tex]
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