Final answer:
Watson and Crick figured out the structure of DNA by deducing its double-helix structure using data from Rosalind Franklin's X-ray crystallography experiments.
Explanation:
Watson and Crick figured out the structure of DNA. In the 1950s, they worked together at the University of Cambridge and used data from scientist Rosalind Franklin's X-ray crystallography experiments to deduce the double-helix structure of DNA. This breakthrough discovery earned them the Nobel Prize in Medicine in 1962.
what are the types of unconformities that can occur in rock layers? a. angular b. disconformity c. nonconformity d. all of the above
compare primary consumer vs. secondary consumer
Primary consumers are herbivores that directly eat primary producers like plants, while secondary consumers are carnivores that feed on primary consumers. Humans can act as primary, secondary, or even tertiary consumers depending on what they eat. The energy flow in ecosystems starts with primary producers and moves up through various consumer levels, with decomposers recycling nutrients from all trophic levels.
Explanation:In ecosystems, the organisms at the base of the food chain are often photosynthetic, such as plants or phytoplankton, and are referred to as primary producers. The primary consumers are usually herbivores that feed directly on these producers. On the other hand, secondary consumers are typically carnivores that eat the primary consumers, obtaining energy from the food chain's second trophic level.
Humans can serve as an example of how consumers can operate at different trophic levels: they are primary consumers when they eat vegetables (primary producers), secondary consumers when they eat herbivorous animals like cows, and even tertiary consumers when consuming carnivorous animals such as salmon.
Primary producers use processes like photosynthesis or chemosynthesis to convert light or chemical energy into food, and consumers obtain energy by feeding on these producers or subsequent consumers. Decomposers, which include small microorganisms, play a different role by consuming materials from all trophic levels after death, whereas tertiary consumers feed only on live secondary consumers.
Why is it that two species cannot occupy the same niche for an extended period of time?
Answer:
In terms of ecology a niche can be defined as role or function an organisms play within the ecosystem. A niche represent the interaction of an organism with the living and non living components of the ecosystem. It is represented by predator-prey relationships, parasitic and mutualistic properties and other functions. The two species cannot occupy the same niche for an extended period of time, this can be explained by competitive exclusion principle. According to this principle, no two species can have the same ecological niche. The two or more species competing for the same resource in an ecosystem the one species having more favorable adaptations will be able to thrive resources better than others. Therefore, this will result in the decrease in abundance, migration and extinction of weak and less competitive species.
Which scientist’s law about the ratios of masses of elements in a compound did John Dalton’s work on the atomic structure help to explain?
Democritus
J. J. Thomson
Ernest Rutherford
Joseph Proust
the correct answwer to this question is D Joseph Proust
Which of the following is not a mechanism for biological evolution
How does the age of seafloor sediments change with increasing distance from the ocean ridge?
A(n)___ is a group of simalar cells that perform a specific function in an organism
Which of the following releases energy?
1. Nutrients entering a cell through the cell membrane
2. Adding an additional phosphate group to an ADP molecule
3. Building sugar or starch molecules for long-term energy storage
4. Removing a phosphate group from an ATP molecule
...?
what is most likely happening to the genetic variation of the population of North East Arctic Cod? The genetic variation in the population is increasing due to selective pressure. The genetic variation in the population is decreasing due to selective pressure. The genetic variation in the population is increasing due to gene flow. The genetic variation in the population is decreasing due to gene flow.
The correct answer is genetic variation in the population is decreasing due to selective pressure.
A phenomenon that changes the fitness and behavior of the living species within a given environment is known as selective pressure. It is the mediating force of natural selection and evolution, and it can be differentiated into two kinds of pressure, that is, abiotic or biotic.
Most of the food and oxygen in the environment is produced by the action of
1. Saprophytic Bacteria
2. Heterotrophic Bacteria
3. Aerobic protozoans
4. Autotrophic organisms
The correct answer is (4) Autotrophic organism.
Green plants make their own food by the process of photosynthesis using sunlight. Most of the autotrophs use carbon dioxide, sunlight and carbon dioxide to produce glucose that is used by the plants to obtain energy. Most of the oxygen comes from these organisms and decrease in the number of green plants can lead to several problems due to decrease in the amount of oxygen. Example: green plants, algae, and even some bacteria. This food and oxygen is produced by the action of autotrophic organisms
A candle’s wick is the fabric string that holds the flame, and it burns down at a constant slow pace when the candle is lit. the wick is usually surrounded by wax. which is the most important property of covalent compounds that makes them useful for making candle wax?
Answer: A low melting point.
Covalent compounds are formed by sharing of electrons between atoms of different elements. The bonds formed between these covalent compounds are generally weak therefore, they exhibit low melting point. Candle is made up of covalent compounds having low melting point which facilitates it's burning.
Answer:
(B) low melting point
Explanation:
Sediment composition in a clastic rock is determined by all of the following EXCEPT:
A. Source rock crystals
B. Transport agent
C. Source rock composition
D. The type of plant that grew near a river
What is the function of the organelle identified as #6 in the picture (it is mostly brown, folded over, and is in the lower right part of the cell)?
D) Packages proteins for transport out of the cell
The Golgi apparatus modifies proteins and lipids that were synthesized in the endoplasmic reticulum (ER). This includes the addition of carbohydrate groups (glycosylation), phosphate groups (phosphorylation), and other modifications. It processes and sorts these molecules to prepare them for their final destinations.
The Golgi apparatus also sorts modified proteins and lipids and packages them into vesicles. These vesicles are then transported to their specific destinations within or outside the cell.
Complete Question:
What is the function of the organelle identified as #6 in the picture (it is mostly brown, folded over, and is in the lower right part of the cell)?
A) movement
B) houses the cells DNA
C) house the digestive enzyme
D) packages proteins for transport out of the cell
Illuminated objects are those that
A. reflect light.
B. absorb light.
C. produce light.
1. Which of the following is NOT a true statement about ATP?
A. ATP consists of ribose, adenine, and three phosphate groups.
B. ADP is produced when ATP releases energy.
C. ATP provides energy for the mechanical functions of cells.
D. Used ATP is discarded by the cell as waste.
tem cells are undifferentiated cells that have the ability to continue to grow and divide in their nonspecialized state for long periods of time (e.g., months or years).
Although the genes found within stem cells are the same, stem cells differentiate into unique cell types (e.g., muscle cells, nerve cells, etc.) due to
A)mutations in their genetic code.
B)different patterns in their gene expression.
C)meiotic division and fertilization.
D)random segregation and proliferation.
Correct answer: B). Different patterns in their gene expression.
The stem cell is a special type of cell that has the potential to develop into other types of cell. It has self-renewal property that can give rise to any type of cell of the body. Gene is expressed due to the specific combination of genes that turned off and on that regulate how the cell functions.
These cells start to divide in an asymmetrical manner in order to produce a large variety of cells with the unique gene expression, functional and morphological characteristics.
Hence, the correct answer would be option B.
Perfect flowers have both male and female parts. The male part is called the _____ and the female part is called the _____.
How long did it take for the population to double a third time?
Over time, some plants growing in an area are crowded out by other plants. The new plants use up water and nutrients needed by the previous plants. The disappearance of the first plants is due to
as you drive along the roadside, you and your friend notice a dead deer that apparently was struck by a car. Your friend comments that she has never seen such a fat deer. "Did you see the size of its abdomen? It was huge!" As a student of forensics, how would you explain to your friend why the abdominal region of the dead deer was so large? CSI
Answer : The size of abdomen appeared to be huge because it stored stomach and many visceral organs.
When the dead deer was spotted by the person it appeared to be much bigger than usual because when the deer was hit by the car it remained there for several hours or may be days and nobody cleared that; From the sun's heat which was falling on the dead deer's body the internal organs were heated up, making them swelled and enlarged than their usual size.
If only a mother has achondroplasia, what are the chances a child will also have the condition?
Which of the following statements does not describe a problem with modern landfills? A. Materials buried in landfills decompose in three years. B. Chemicals leaking out of the waste stored there may pollute wells or groundwater supplies. C. Explosive gases can be produced by landfills and may build up in basements of nearby buildings. D. It takes a lot of space to contain the amount of garbage produced by households.
The statement that wrongly describes the problem with modern landfills is ;
It takes a lot of space to contain the amount of garbage produced by households. ( D )Landfills are built mostly for the storage of industrial and household wastes, which might be harmful to the environment if not properly disposed or left to litter the environment.
when Industrial wastes are disposed in landfills there is the danger of having chemicals leak into ground water thereby leading to water contamination. which is a problem with modern day landfills.
Landfills are usually existing pits, which are controlled by waste management agencies. and therefore do require much land mass but depth to contain the amount of wastes stored in them.
Hence we can conclude that The statement that wrongly describes the problem with modern landfills is , It takes a lot of space to contain the amount of garbage produced by households.
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how do electrons gain energy in photosystem 1?
a. They absorb photons.
b. They use energy in the form of glucose.
c. They take energy from ATP molecules.
d. They use energy from a hydrogen ion pump.
Electrons in photosystem I gain energy by absorbing photons, which excites the electrons from splitting water, later used to form ATP and NADPH.
Explanation:Electrons gain energy in photosystem I when they absorb photons. The chlorophyll molecules in the photosystem absorb light and become excited. This energy is then used to excite electrons, which are transferred to the primary electron acceptor. The energized electrons come from the splitting of water, a process that occurs in photosystem II and is aided by the light energy captured by chlorophyll a molecules.
Once excited, the electrons travel through the electron transport chain, contributing to the generation of a proton gradient that leads to the synthesis of ATP in chemiosmosis. Then, absorbing a second photon in photosystem I results in the formation of NADPH molecule, another energy carrier important for the light-independent reactions such as the Calvin cycle.
Learn more about Photosystem I here:https://brainly.com/question/35138971
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In order for a human female to express a recessive sex-linked trait, she must have....
A) two recessive alleles
B) an inactive allele
C) a recessive allele on a Y chromosome
D) two recessive autosomal alleles
Which organism's are omnivores?
A) The snake, the bear, and the fish
B) The fish and the eagle
C) The bear and the fish
D) The snake and the mouse
If an omnivore is an animal that eats both plants and animals, I'd choose D because all the other options have fish in them. Fish basically eat other fishes right?
Or am I wrong in my thinking?
Answer:
Its C) because bears are omnivores they eat plants and animals a bear eats berrys and fishes.
Explanation:
5. Why are ecological pyramids shaped as pyramids? (1 point)
because there is a large decrease in the amount of energy or biomass as you move from one trophic level up to the next
because the movement of energy through the biosphere follows a path similar in shape to a pyramid
because decomposers form a wide base of support at the bottom of a food web similar to the base of a pyramid
because a pyramid represents a stable building form that is similar to the structure of a stable ecosystem
6. What is true of matter in ecosystems? (1 point)
Nonliving things are essential for carrying out the chemical transformation of certain elements so that living things can use them.
Living things can recycle elements within an ecosystem as long as decomposers are present.
Matter flows in a one-way direction with a 10% loss at each move up in trophic level.
Elements continuously cycle between the physical environment and living organisms.
7. Which of the following is a food chain in the food web shown in Figure 3–4?
(1 point)
tree, rabbit, hawk, snake
grass, grasshopper, snake, hawk
grass, caterpillar, robin, hawk
tree, deer, mountain lion, fox
Organisms from the higher trophic levels consume organisms from the lower trophic levels. During this process, energy is lost as metabolic heat. Primary producers on the first trophic level contain the greatest amount of energy originally from the sunlight. The next trophic level belongs to primary consumers that consume primary producers which result in less energy. Similarly, secondary consumers eat primary consumers, and energy is lost again. The highest trophic level is tertiary consumers and they contain the least amount of energy.
Q6. The answer is Elements continuously cycle between the physical environment and living organisms.
Biogeochemical cycles are pathways by which chemical substances move through biosphere and geosphere (lithosphere), as well as atmosphere and hydrosphere. In these cycles elements are recycled, they are not lost. They continuously cycle between the physical environment and living organisms.
Q7. The answer is grass, grasshopper, snake, hawk.
Figure 3-4 is not attached, however, the logic food web among all choices wood be: grass, grasshopper, snake, hawk.
Grass belong to the producents. Grasshopper is a primary consumer and it eats producent grass. Snake, as a secondary consumer, eats the primary consumer grasshopper. A terciary consumer hawk eats the secondary consumer snake.
explain the basic structure of a virus and how it replicates
Final answer:
Viruses are composed of genetic material encased in a protein capsid, sometimes with an envelope with glycoproteins for host cell attachment. Viruses replicate by invading host cells and utilizing their machinery through a series of steps, culminating in the production of new virions. The replication cycles, lytic and lysogenic, are characterized by the specific structure and genome of the virus.
Explanation:
Basic Structure of a Virus
The fundamental structure of a virus consists of genetic material, which is either DNA or RNA, enclosed within a protein shell known as a capsid. Some viruses also possess an additional lipid layer called an envelope, which often includes glycoproteins that help the virus to attach to host cells.
How Viruses Replicate
Viruses replicate by invading and hijacking a host cell's machinery. The process unfolds through several stages: attachment, where the virus binds to the cell; penetration, enabling the viral genetic material to enter; uncoating, which releases the genetic material; replication, where the host cell synthesizes new viral genomes and proteins; assembly, in which new virus particles are put together; and finally, release, where the new virions exit the host cell, often destroying it in the process. Retroviruses, like HIV, use reverse transcriptase to convert RNA into DNA to insert into the host genome.
Classification and Replication Cycles
Viruses are categorized by their replication cycles, the lytic and lysogenic cycles, which depend on their structure and genome. These cycles describe the processes of how viruses produce new particles that can then infect additional cells.
Deconstructive forces such as erosion helps to build up the Earth’s surface.
True or False
Answer:true
Explanation:
ERosion is the process in which the top layer of soil get removed. It involves the loosening of soil from earth’s surface at one location and moved to another location. It causes the filling of valleys, and make rivers appear and disappear as the soil moves from one location to another in the process of erosion.
Meiosis is different from the process shown because, during meiosis,
A) chromosomes are not replicated.
B) two gametes are made for every original cell.
C) four gametes are produced for every original cell.
D) four somatic cells are produced for every original cell.
Answer: The correct option is -
C) Four gametes are produced for every original cell.
Explanation:
Meiosis is a type of cell division that occurs during the process of formation of gamete ( that are haploid, reproductive cells such as eggs and sperms) particularly in case of organisms that perform sexual reproduction.
During this process, a diploid parent cell produces four haploid cells (gametes or sex cells) through two rounds of cell division ( that are meiosis I and meiosis II).
This is also known as reductional cell division. Thus, four gametes are produced for every original cell.
Therefore, option C) is the right answer.
Alexander was studying the affect of playing rock music on plant growth. One of the plants was exposed to rock music for 24 hours a day for a period of 6 weeks. Data on the growth of the plant was collected at the end of each week and plotted in a graph, time in weeks on the X-axis and height in decimeters on the Y-axis. Based on the data, which would be the MOST reasonable measurement at the end of a 8 week period?
A) 2 decimeters
B) 6 decimeters
C) 8 decimeters
D) 16 decimeters
Answer:
Option C.
Explanation:
If a line passes through two points [tex](x_1,y_1)[/tex] and [tex](x_2,y_2)[/tex], then the equation of line is
[tex]y-y_1=\frac{y_2-y_1}{x_2-x_1}(x-x_1)[/tex]
From the given graph it is clear that the line passes through the point s(0,0) and (1,1). So, the equation of trend line is
[tex]y-0=\frac{1-0}{1-0}(x-0)[/tex]
[tex]y=x[/tex]
Substitute x=8 in the above equation to find the MOST reasonable measurement at the end of a 8 week period.
[tex]y=(8)[/tex]
[tex]y=8[/tex]
The MOST reasonable measurement at the end of a 8 week period is 8 decimeters.
Therefore, the correct option is C.