Answer: 4 Guanines
Explanation: Following Chargaff's ratio that describes the ration of purines to pyrimidines as 1:1, if there are 23 purines, it follows that there should be 23 pyrimidines; 15 Thymines should therefore be hydrogen bonded to 15 Adenines by complementary base pairing.
We are then left with 8 nucleotides composed of guanines and cytosines in complementary base pairs. This means that half that number (4) should be guanines and the rest cytosines.
The DNA is a double-stranded molecule, which is made up of purine, pyrimidine, a pentose sugar, and phosphate backbone. Chargaff's rule states that any species will have a stoichiometric ratio of 1:1.
The number of guanines in the double-stranded DNA is 4.
In the DNA, the base pairing occurs as:
The guanines bind with cytosine through hydrogen bonding. The adenine binds with thymine with two hydrogen bonds.In the given nucleotide, there are 23 purines (guanine and adenine). There are 15 thymines in the DNA molecule. Based on the Chargaff rule, the 15 thymines will bind to adenine, leaving only 4 guanines and 4 cytosines. Thus, there will be 4 cytosines left to bond with the guanines to achieve Chargaff's ratio of 1:1.
Therefore, the guanine in the nucleotides will be 4.
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When bonds are broken between atoms in molecules, energy is
a. stored as ADP
b. released
c. created
d. conserved
ANSWER: b. released
Explanation:
A pathogen that feeds off and causes harm to other organisms is called what?
This stage of cellular respiration requires the presence of oxygen.
A. anaerobic respiration
B. glycolysis
C. fermentation
D. aerobic respiration
Answer:
Aerobic Respiration
Explanation:
Aerobic (in the presence of oxygen)
Anaerobic (absence of oxygen)
Glycolysis (central pathway for glucose{sugar} metabolism)
Fermentation (chemical breakdown of a substance by bacteria, yeast or other microorganisms and the escape of gases and heat)
Chemicals used in chemotherapy treatments to fight cancer can also harm cells in hair follicles and bone marrow.
What characteristic do these cels most likely share with cancerous cells?
O They form tumors.
O They spread through the blood.
• They divide rapidly.
O They contain a mutation.
A
Answer:
They divide rapidly
Explanation:
Some normal cells such as hair follicles cells, mouth cells, digestive tract cells, and bone marrow cells divide rapidly. In mammalians, hair follicle cells are cells localized in the skin, specifically in the dermal layer of the skin. In this region, epidermal cells that form the root of the hair divide rapidly by interacting with neuropeptides, hormones, and immune cells. On the other hand, the bone marrow is a spongy tissue found in bones that contain stem cells (which also divide rapidly). In consequence, it is well-known that high-dose chemotherapy treatments may damage these types of cells.
What is a coral reef made of?
A. Grass
B. Dead animals
C. Volcanic rocks
D. Sand
Answer: B. Dead animals
Explanation:
Coral reefs are made with calcium. How do they get this calcium? From the skeletons of various organisms in the ocean.
Would the movement of oxygen through the cells?
Cyanide poisons cell by limiting the production of ATP through cellular respiration. Cyanide does this by blocking the enzyme that attaches electrons and hydrogen atoms to oxygen to form water.
Which stage of cellular respiration would this most directly affect?
A Acetyl CoA formation
B Electron transport chain
C Glycolysis
D Krebs cycle
HELPPPPPP ASAPPPPPPPP HELPPPP
Answer:
it is C. Little to No agintation
Explain how matter is cycled between plants and animals.
The food of come from autotrophic plant to animal through food chain. The energy cycles between the air and soil and plants, animals, and microbes occur by food web.
What are the components of food web?A food web is defined as the cyclical event of energy transfer among different trophic level of organism.
The major components are primary producers, primary consumers, secondary consumers, tertiary consumers, quaternary consumers
Primary producers are the green autotrophic plants and capture some of the solar energy and convert it into chemical energy by photosynthesis.
The net primary productivity (NPP) of energy is defined as the rate of photosynthesis minus the rate of respiration of plants.
Primary consumers or herbivores feed on producers constitute the second trophic level of the food web.
in third tropic level, Secondary consumers eat primary consumers where as tertiary consumers, quaternary consumers or predators, carnivores or omnivores, which are both plant- and animal-eaters, such as humans.
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4. How did the pH of the water affect the hatching of the brine shrimp?
I
Please help me ?!!!!
Answer:
the last one I am guessing
Explanation:
If right can you give me brainiest
Hope you have a wonderful day:)
if some can help me with my biology final the whole 25
Answer:
add the answers if you dont know
Explanation:
Answer:
KC is looking at cells in biology class, but he doesn't know where they came from. He sees that the cells under his microscope have cell walls and chloroplasts. Therefore, KC is likely observing cell from:
A leaf that got blown onto the floor.
Plant cells are the only cells w/ chloroplast!
Explanation:
pick me as the brainliest
Drag each tile to the correct box.
Sort the types of energy according to the order in which they move through this system:
Water stored in dams falls freely with the force to make a turbine move. The turbine moves and produces electricity. This electric energy is
supplied to homes. At home, we use electricity for heating, cooling, and lighting.
Put these in order:
Electrical energy
Light energy
Potential energy
Kinetic energy
Answer:
Electrical energy > kinetic energy > light energy > potential energy
Explanation:
what molecules from proteins when linked together with covalent bonds
Answer:
Amino Acids
Explanation:
they link with each other through means of peptide bonds and as a result form proteins
How old do paleontologist believe the earth is?
Answer:
Scientists now know the Earth is actually 4.54 billion years old, an age built on many lines of evidence from the geologic record.
Explanation:
AUG is generally a start codon. what is the amino acid that AUG codes for ?
(FW.02]The diagram below shows a portion of the water cyle.
Y
Spring
Aquifer
What does Y most likely represent?
O precipitation
Orecharge
Oatmosphere
Ogroundwater
Answer:
I would have to say recharge of the aquifer by using ground water after some precipitation.
Explanation:
Melting snow or rain increases ground water that percolates down to replenish the aquifer.
Elevation changes causes the aquifer to flow up in low spots/springs on the surface. And the cycle repeats through evaporation and plant respiration.
PART II
Direction: Write the symbols of some elements and the group number it belong to
Name
Symbol
Group Number
Iron
Silver
Mercury
Oxygen
Gold
Potassium
Xenon
Magnesium
Hydrogen
#pa help po
Answer:
Iron -> Fe - Group 8
Silver -> Ag - Group 11
Mercury -> Hg - Group 12
Oxygen -> O - Group 16
Gold -> Au - Group 11
Potassium -> K - Group 1
Xenon -> Xe - Group 18
Magnesium -> Mg - Group 2
Hydrogen -> H - Group 1
Did the medical assistant have the syringe properly positioned
Answer:
the medical assistant could have positioned the syringe wrongly, as it could have been the one causing pain and irritation, and it was vital to confirmed..........After being hunted to near extinction, wolves were reintroduced to Yellowstone National
Park in 1995. After two years, the population of wolves increased rapidly until 2009.
After 2009, the population decreased slightly and has remained at an average of 93
wolves. Which type of growth curve describes the Yellowstone wolves?
A. population density curve
B. exponential growth curve
C. bell curve
D. logistic growth curve
Answer: B: exponential growth curve
Explanation: An exponential growth curve is J-shaped. Exponential growth is more common in R-selected species, which have a short life span and a high rate of reproduction. Yellowstone National Park has 124 wolves living in it.
What TWO things cause denaturation of enzymes:
According to the bar graph, how many players averaged more than 30 points
per game?
Answer:
2 players
Explanation:
Answer:
2
Explanation:
= Arenas and Bryant
.........
PLEASE HELP MEEE. _______ and _____
are what we call the molecules
before and after a chemical reaction.
The terms we call the molecules before and after a chemical reaction are - reactants and products respectively.
Molecules before and after a chemical reactionChemical reactions are takes place when chemical bonds form between molecules and atoms of substances. There are two-part to any chemical equation: part before the chemical reaction and after the chemical reaction.
In the part before the chemical reaction starts, there are molecules of the substance is called reactants that react with one another in chemical reaction and form or break chemical bonds of molecules. Products are newly formed substances by forming bonds in a chemical reaction.
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Reactants and products are the names that we call the molecules before and after a chemical reaction respectively.
What is a Chemical reaction?A chemical reaction may be defined as a mechanism that significantly directs the chemical transformation of one set of chemical substances or molecules to another. This process of chemical transformation utilizes numerous catalysts to enhance the rate of reaction.
The amount or number of chemical substances or molecules that are present before the progression of reaction are known as reactants.
While after the successful progression or completion of a specific chemical reaction such reactants are performed into another, these substances or molecules are known as products.
Both the molecules of reactants and products possess some sorts of chemical identity in order to distinguisg from each other.
Therefore, Reactants and products are the names that we call the molecules before and after a chemical reaction respectively.
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Scientists have names for more than 30 types of snow crystals.
Answer:
it's false there are only five types of snow crystals
False I looked it up on goggle and it said that only 7 snow crystals are known
Which wavelength of light are more stretched—red light or blue light?
Answer:
Red
Explanation:
Blue light has a shorter wavelength than red.
respiration in echinoderms
Which of the following are solutions to slow down groundwater depletion?
a -Landscape with native plants
b- promote the use of water resources
c- encourage population growth
d- develop crops that require more water
1) State three economic importance of Amoebiasis,
Answer:
An amoeba's economic value can be found in medicine and nutrient recycling. According to Biology Reference, certain amoeba species can cause sickness and death, while others are important in maintaining healthy ecosystems because they recycle the nutrients needed by bacteria and keep the bacterium population under control.
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1. The parts of the flower involved in reproduction are ________ and __________
2. The anthers bear the ___________the microspore mother cells give rise to _______or pollen grains after meiotic cell division.
Answer:
1. Stamen and pistil
2. Pollen, microspore
Explanation:
The flower is the reproductive part of certain plants called ANGIOSPERMS. They make use of their flower for sexual reproduction. The different parts of the flower work together to achieve a common goal, which is to reproduce, however, they do it in various ways. For example, accessory parts like petals attract pollinators. The major parts of the flower that are directly involved in the reproductive act are STAMEN (male) and PISTIL (female).
The stamen which constitutes a structure called ANTHER bears the pollen grains or microspore, which is made when the microspore mother cells undergo meiotic division. Hence, the pollens are released from the anther of a male flower (stamen), into the stigma of the female flower (pistil).
What structure provide shape and support for the cell?
A.Chloroplast
B.Mitochondria
C. cell Wall
D.Golgi bodies
The cell wall provides shape and support for the cell. Therefore, option (C) is correct.
What is cell wall?In the cells of plants, fungi, and some bacteria, the cell wall is a strong structure that encloses the cell membrane. It has a solid and strong structure because it is formed of chitin, which is found in fungi and cellulose in plants. The cell wall supports it mechanically, shields it from harm, and aids in keeping its shape. Moreover, it stops the cell from bursting or collapsing under pressure, which is crucial for plant cells because they must maintain turgor pressure in order to function properly.
Animal cells, on the other hand, lack a cell wall and instead contain a cytoskeleton formed of protein fibers that gives them stability and shape. Organelles that perform photosynthesis include chloroplasts, mitochondria, and golgi bodies, which also produce energy and process and transport proteins inside of cells.
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