Answer:
James Watson and Francis Crick
Explanation:
Using the catalase test, a Streptococcus sample would be:
A. Gram (+), Catalase (+)
B. Gram (-) Catalase (+)
C. Gram (-), Catalase (-)
D. Gram (+), Catalase (-)
Answer:
The correct answer would be option D: Gram (+) and Catalase (-).
Explanation:
Streptococcus bacteria have a cellular wall made up of various layers of peptidoglycan which is a macromolecule composed of amino acids and sugars that are assembled as if woven together, therefore they are Gram (+) bacteria.
The Catalase test is used to determine if a bacteria has the ability to produce the Catalase enzyme, the principle of the test is, when the bacteria comes into contact with hydrogen peroxide, if it is Catalase (+) then oxygen bubbles will appear, since the bacteria is able to break down hydrogen peroxide into oxygen and water, and if the bacteria is Catalase (-) then, nothing will happen.
In this case, Streptococcus bacteria are not able to produce the Catalase enzyme, therefore, they are Catalase (-).
Answers A, B and C are incorrect because they have the wrong combinations of a results, in answer A: Streptococcus bacteria are Gram (+) but Catalase (-), in answer B: Streptococcus bacteria are neither Gram (-) or Catalase (+), and in answer C: Streptococcus bacteria are Catalase (-) but are not Gram (-).
Final answer:
A Streptococcus sample would yield a result of Gram (+), Catalase (-), which is answer D. This is based on the fact that Streptococcus species are catalase-negative, so no bubbling would occur during the catalase test.
Explanation:
Using the catalase test, a Streptococcus sample would be Gram (+), and Catalase (-). This means the correct answer is D. Gram (+), Catalase (-). The catalase test differentiates between bacterial species that produce the enzyme catalase, such as Staphylococcus species, and those that do not, such as Streptococcus species. Streptococcus species are catalase-negative, meaning no bubbles will form when hydrogen peroxide is added to a culture sample. In contrast, Staphylococcus species are catalase-positive and will produce bubbles upon the addition of hydrogen peroxide due to the degradation of hydrogen peroxide into water and oxygen gas.
Which statement accurately describes a P wave? A. A P wave travels more slowly than an S wave. B. A P wave can travel through liquids. C. A P wave moves particles up and down or side to side. D. A P wave can move through solid rock only.
Answer:
P wave can travel through liquids
Explanation:
Two main types of seismic waves are P wave and S wave. P waves stand for pressure waves or primary waves.
P waves are the first waves signal during the earthquake.P wave can travel through any media , the media can be liquid, gas and solid. P waves can not move the particles side to side and up and down.
Thus, the correct answer is option (B).
Answer:
P wave can travel through liquids
Explanation:
Which of the following is quantitative information?
O
A. The clouds are gray.
O
B. The forecast calls for snow.
O
C. The weather is cold and icy.
O
D. The temperature is 32 degrees.
Answer:
D.
Explanation:
The temperature is 32 degrees is quantitative information.
Quantitative information involves numerical data. In this case, the statement 'The temperature is 32 degrees.' is quantitative because it provides a specific numerical value.
VERY URGENT --- GIVING AWAY 50 POINTS
Sort these problems into three groups; problems with bones, problems with muscles, and other problems.
-torn muscle
-osteoporosis
-tendonitis
-scoliosis
-arthritis
-fracture
-muscular dystophy
-torn ligament
Answer:
Explanation:
Problems with bones
osteoporosis
arthritis
fracture
-scoliosis
-tendonitis
Problems with muscles
torn muscle
muscular dystophy
torn ligament
tendonitis
Problems with bones:
-osteoporosis
-fracture
-scoliosis
-tendonitis
Problems with muscles:
-torn muscle
-muscular dystophy
-tendonitis
Others:
-arthritis
-torn ligament
which type of microscopic organisms thrives in deep water brine pools in the gulf of mexico
Answer:
Chimaeridae fish
Explanation:
Chimaeridae fish are a type of microscopic organisms thrives in deep water brine pools in the gulf of mexico.
black people 12345678901234567890
Drag each tile to the correct box.
Lucia is walking barefoot in her yard. She accidentally steps on a nail. How will her nervous system work to generate a reaction? Arrange the events chronologically.
Interneurons relay the impulse to motor neurons in the spinal cord.
She immediately moves her foot.
The sensory neuron generates an impulse.
Receptors in her toe receive stimuli.
Motor neurons signal the leg muscles.
Answer:
Correct order is
a) Receptors in her toe receive stimuli.
b) The sensory neuron generates an impulse.
c) Inter neurons relay the impulse to motor neurons in the spinal cord.
d) Motor neurons signal the leg muscles.
e) She immediately moves her foot.
Explanation:
Foot of Lucia contains stimuli receptors. As Lucia steps on the nail, the receptors in the toe receives the stimuli and hence her sensory neurons becomes active and they generate an impulse. These impulses are transmitted from sensory neurons via inter neurons to the brain. Brain processes the information and sends the message via inter neurons to the motor neurons. Motor neurons then signals the leg muscles and then she immediately removes her leg away from the pin.
Hence correct order is
a) Receptors in her toe receive stimuli.
b) The sensory neuron generates an impulse.
c) Inter neurons relay the impulse to motor neurons in the spinal cord.
d) Motor neurons signal the leg muscles.
e) She immediately moves her foot.
Final answer:
The events in the nervous system when Lucia steps on a nail form a reflex arc, starting with pain receptors and following through sensory neurons, interneurons in the spinal cord, motor neurons, and finally resulting in muscle contraction and movement.
Explanation:
The student's question pertains to the sequence of events that occur in the nervous system when Lucia steps on a nail. To answer this question, we will arrange the events in chronological order as they would happen within a reflex arc.
Receptors in her toe receive stimuli.
The sensory neuron generates an impulse.
Interneurons relay the impulse to motor neurons in the spinal cord.
Motor neurons signal the leg muscles.
She immediately moves her foot.
The sequence starts with the activation of pain receptors (nociceptors) when the nail is stepped on. This stimulus is then conveyed through sensory neurons to the spinal cord, where it is processed by interneurons.
The interneurons quickly transmit the impulse to motor neurons, which signal the leg muscles to contract, resulting in the immediate withdrawal of the foot. This entire process forms a reflex arc, allowing for a rapid response without the need for brain involvement.
What increases the frequency of adaptive mutations in a population over time
Answer:
Natural selection
Explanation:
Adaptive mutations are considered the result of stress that particular individual bears out. While natural selection is the selection and survival of fittest individual with favorable traits, traits are passed from one generation to the other and individual with the passage of time adapts particular changes to get survived.
Most animals can be classified as
Invertebrates
Arthropods
Chordates
Sessile
Final answer:
Most animals, about 95 percent, are invertebrates and do not have a vertebral column. Arthropods are a major group of invertebrates with jointed appendages. Chordata includes both vertebrates and invertebrates, like tunicates and lancelets.
Explanation:
Most animals can be classified into different groups based on their physical structures and evolutionary relationships. The vast majority of animal species, about 95 percent, are invertebrates. Invertebrates are animals that lack a vertebral column or backbone. They include a huge diversity of animals, comprising millions of species across approximately 30 phyla. Among these, arthropods represent a significant portion, including organisms such as insects, arachnids, and crustaceans, which are known for their jointed appendages. The phylum Chordata includes not only vertebrates like mammals, birds, and fish but also invertebrate chordates such as tunicates and lancelets. Understanding the classification of animals is crucial for studying biodiversity and the relationships between different species.
Blank) reproduction allows for species to evolve or adapt to a greater range of conditions.
1. Asexual. 2. Sexual
Sexual reproduction allows for species to evolve or adapt to a greater range or conditions.
Sexual reproduction brings two sets of genes to the table to be passed to the offspring, since there are two parents. Asexual reproduction only has one parent so the offspring will only get one option of genes. This means that asexual reproduction does NOT allow adaptation.
Hope this helped!
~Just a girl in love with Shawn Mendes
sexual reproduction
Explanation:
gp this helps!!
NEED HELP ASAP!!!
Choose the best explanation of codominance.
A. Genes are blended during homologous recombination.
B. In a heterozygote, both alleles are expressed.
C. In a heterozygote, both alleles combine to form an intermediate phenotype.
D. A heterozygote is considered a carrier for the recessive allele.
Answer:
In a heterozygote, both alleles are expressed. - is the best explanation of codominance.
Explanation:
Closely related to incomplete dominance is codominance, in which both alleles are simultaneously expressed in the heterozygote. Codominance is a relationship between two versions of a gene. Individuals receive one version of a gene, called an allele, from each parent. If the alleles are different, the dominant allele usually will be expressed, while the effect of the other allele, called recessive, is masked.
Option A. In a heterozygote, both alleles are expressed. - is the best explanation of codominance.
Closely associated with incomplete dominance is called codominance, and both alleles are expressed simultaneously in heterozygotes. Codominance is the relationship between two versions of a gene. Individuals receive one version of a gene called an allele from each parent. If the alleles are different, the dominant allele is usually expressed, but the effects of other alleles called recessive are masked.
What is codominance?Codominance in genetics, the phenomenon in which two alleles (different versions of the same gene) are expressed at equal levels in an organism. As a result, the traits associated with each allele are displayed at the same time.
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Why do leaves appear green?
A. Green wavelengths are the highest energy.
B. Green wavelengths are the least used in photosynthesis.
C. Green wavelengths aren't used in photosynthesis.
D. Only green wavelengths are used in photosynthesis.
Answer:
The correct answer option is B. Green wavelengths are the least used in photosynthesis.
Explanation:
Plants have a pigment in them called as chlorophyll. This chlorophyll is able to absorb only certain wavelengths of the light within the light spectrum.
From that visible light spectrum, chlorophyll is only able to absorb light of red and blue wavelength. The green light is not absorbed by the by chlorophyll as it is reflected back.
Therefore, this reflection of green light makes the leaves to appear green.
When a human or animal consumes food, the carbon in that food is most likely to be converted into which of the following elements?
oxygen
nitrogen
carbon remains carbon
hydrogen
I HAVE TO FINISH THIS IN 3 MINS
Answer:
Carbon remains carbon
Explanation:
An atom of one element does not change into an atom of another element.
That's why A, B, and D are wrong.
diffrence between internal and extarnal fertilization
Answer:
The difference between internal and external fertilization is that internal fertilization occurs inside the body, whereas external fertilization happens outside the body. Fertilization is the process by which a sperm cell and an egg cell unite to form a completely new individual.
Explanation:
The government of a flood-prone region wants to implement some measures to reduce the risk of floods, Which method is likely to reduce the risk of
floods in that region?
A.
deforestation
B.construction of bridges in rivers
C.building concrete roads
D. preservation of wetlands
Answer:
The correct answer is option D. "preservation of wetlands".
Explanation:
Wetland are areas of lands that are saturated with water, usually comprised by marshes or swamps. Preservation of wetlands help to reduce the risk of floods because wetlands temporarily store and slow the release of stormwater. It has been reported that areas where wetland have been lost, the chances of flood increases by as much as 80 percent. The government of a flood-prone region would likely reduce the risk of floods by preserving its wetlands.
Answer:
D. preservation of wetlands
Explanation:
Which organism is a fungus-like protist?
Answer:
Slime molds and water molds
Explanation:
Fungus-like protists usually do not move, but a few develop movement at some point in their lives. Two major types of fungus-like protists are slime molds and water molds.
ANSWER:
Molds are fungus-like protists. Molds are organisms that resemble fungi and also have spores like fungi do. These spores are used for reproduction by the molds.
EXPLANATION:
Molds are organisms feed on decaying matter. Molds are usually found in moist conditions like moist soil or surface water. They are parasitic in nature and usually do not move from one place to another. Molds also have cell walls. Water molds and Slime molds are the best examples of molds that are fungus-like protists.Which type of rock may contain fossils?
Answer:
sedimentary rocks.
Explanation:
Answer:
sedimentary rocks.
Explanation: Hope it helps!
Nearly all of the energy that Earth receives from the Sun is used in photosynthesis.
Answer:
T
Explanation:
In the atmosphere water vapor condenses to form clouds. Nearly all of the energy that Earth receives from the Sun is used in photosynthesis.
that will be false my good sir and or ma'am
What does the pulmonary vein do?
A. Brings blood from the liver to the heart
B. Brings blood from the heart to the liver
C. Brings blood from the heart to the lungs
D. Brings blood from the lungs to the heart
Answer:
d
Explanation:
Brings blood from the lungs to the heart
An prokaryote that lives in mild environments belongs to kingdom...
A. Archaebacteria
B. Fungi
C. Animalia
D. Protista
E. Bacteria
F. Plantae
Briefly explain how nerve impulses travel in a body?
Answer:
When a nerve impulse reaches the end of an axon, the axon releases chemicals called neurotransmitters. Neurotransmitters travel across the synapse between the axon and the dendrite of the next neuron. Neurotransmitters bind to the membrane of the dendrite.
Nerve impulses travel through the body because of neurons.
In a neuron, stimuli always propagate in the same direction: they are received by the dendrites, go through the cell body, travel through the axon and, from the end of it, are passed to the next cell (dendrite - cell body - axon).
The nerve impulse that propagates through the neuron is of electrical origin and results from changes in the electrical charges on the outer and inner surfaces of the cell membrane.
The membrane of a resting neuron has a positive electrical charge on the outside (facing outside the cell) and a negative charge on the inside (in contact with the cell's cytoplasm). When that membrane is in such a situation, it is said to be polarized. This difference in electrical charges is maintained by the sodium and potassium pump. Thus separated, the electrical charges establish a potential electrical energy across the membrane: the membrane potential or resting potential (difference between the electrical charges across the membrane).
When a chemical, mechanical or electrical stimulus arrives at the neuron, there may be a change in the permeability of the membrane, allowing large sodium to enter the cell and small potassium to leave it. With this, there is an inversion of the charges around this membrane, which is depolarized generating an action potential. This depolarization spreads through the neuron, characterizing the nervous impulse.
Immediately after the impulse passes, the membrane undergoes repolarization, recovering its resting state, and the transmission of the impulse ceases.
The stimulus that generates the nervous impulse must be strong enough, above a certain critical value, which varies between different types of neurons, to induce depolarization that transforms the resting potential into an action potential. This is the threshold stimulus. Below this value, the stimulus only causes local changes in the membrane, which soon cease and do not trigger the nervous impulse.
Any stimulus above the threshold generates the same action potential that is transmitted along the neuron. Thus, there is no variation in the intensity of a nervous impulse due to the increase in the stimulus; the neuron obeys the "all or nothing" rule.
Thus, the intensity of the sensations will depend on the number of depolarized neurons and the frequency of impulses. Imagine a burn on your finger. The larger the burned area, the greater the pain, as more receptors will be stimulated and more neurons will be depolarized.
Which are examples of short-term environmental change? Check all that apply.
tsunamis
El Niño
large asteroid and comet impacts
volcanic eruptions
global warming
Answer:one,two,four
Explanation:
Answer:
tsunamis Yeah
El Niñolarge Yeah
asteroid and comet impacts Nope
volcanic eruptions Yeah
global warming Nope
Explanation:
Which of these statements best describes the role of creativity in science?
A. it helps scientists prove non-observable theories
B. it helps scientists make conclusions non-testable
C. it helps scientists give valid scientific explanations
D. it helps scientists create theories which are universal
Answer:
D) it helps scientists create theories which are universal.
Creativity in science helps scientists to develop and refine universal theories, enabling innovative thinking and facilitating a common understanding of concepts across the global scientific community.
Explanation:The best description of the role of creativity in science would be that it helps scientists create theories which are universal. Creativity contributes significantly to the development and refinement of theories in science. It allows scientists to explore innovative hypotheses and ideas, envisioning various scenarios, applications, and implications of their research.
Critically, it is through creative thinking that many ground-breaking theories have been standardized, allowing for a universal understanding and communication of these concepts across the global scientific community.
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what is the main function of a fungi's hyphae
Answer:
Hyphae perform a variety of functions in fungiExplanation:
They contain the cytoplasm or cell sap, including the nuclei containing genetic material. Hyphae absorb nutrients from the environment and transport them to other parts of the thallus (fungus body).
ANSWER:
The hyphae of the fungi "absorb nutrients" from the environment. Then transport these to other parts of the body of the fungi.
EXPLANATION:
Hyphae contain the cell sap or the cytoplasm of the fungi. It also contains nuclei which has genetic information about the fungi. Hyphae can be found either in the roots or phylum of the vascular plants and therefore help vascular plants to get water and nutrients from the soil.Which of the following best describes the use of a renewable resource?
Most power plants burn fossil fuels to generate electricity for use in homes and offices.
Natural gas is extracted from deep in the Earth and piped to customers to use for cooking.
Water falls through openings in a dam turning turbine blades that generate electricity.
We use gasoline to power our cars to get to work and school each day.
Answer: C. Water falls through openings in a dam turning turbine blades that generate electricity. Hope this helps, please rate Brainliest :)
Explanation: Renewable resources are resources that we can keep using without depleting the earths natural resources. Turbines and the waterfall are endless, not using up anything.
The answer is C. Water falls through openings in a dam turning turbine blades that generate electricity.
Ocean dumping:
A)can contaminate beaches.
B)is the most sanitary form of dumping.
C)provides a food source for fish.
D)All of these choices are correct.
in which atmosphere layer do humans live most of their lives
Answer:
Troposphere.
Explanation:
Humans live most of their lives in the troposphere atmosphere.
Humans live most of their lives in the Troposphere, the lowest layer of the Earth's atmosphere. It contains the majority of Earth's weather patterns and breathable oxygen.
Explanation:Humans spend most of their lives in the atmosphere layer called the Troposphere. The Troposphere is the lowest layer of the Earth's atmosphere and is located directly above the surface of the Earth. This layer contains a majority of Earth's weather patterns and consists of most of the breathable oxygen that humans need for survival. The Troposphere's thickness varies from place to place, extending approximately 9 kilometers at the poles and up to 17 kilometers at the equator. Most commercial aircraft fly within this layer of the atmosphere due to its sufficient oxygen supply and steadier conditions.
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Why does sexual reproduction result in more genetic variation in a species
than asexual reproduction?
O
A. In sexual reproduction, offspring have more chromosomes than
either parent
O
B. In sexual reproduction, offspring have fewer genes.
O
C. In sexual reproduction, offspring are not identical to either parent.
Answer: C. In sexual reproduction, offspring are not identical to either parent
Explanation:
Sexual reproduction results in more genetic variation because offsprings are not identical to either parent.
What is sexual reproduction?Sexual reproduction occurs when the sperm from the male parent fertilizes an egg from the female parent.Sexual reproduction involves the fusion of male and female gametes which leads to genetic variation.Crossing between male and female chromosomes takes place. Due to the crossing of chromosomes the child receives some features of the father and others of the mother.What is asexual reproduction?Asexual reproduction occurs when a single parent divides.It does not involve the fusion of gametes and the offspring will be identical to the parent.To learn more about Reproduction:
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2. This feature of the prokaryotic cell helps the cell to stick to surfaces.
Answer:
The pilus: they helpe prokaryotic cells stick to surfaces
Answer:
The answer is Fimbria.
Explanation:
Fimbria is a protein appendix present in many bacteria, formed by thin segments, such as short hairs, which are used by bacteria to adhere to the surface. Fimbrae, often confused with pilis, which are slightly longer hair-shaped structures, used for bacterial conjugation to transmit genetic material.
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Earth and Space Systems: Mastery Test
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Select the correct answer
Ganymede is one of the many moons of Jupiter it is nearly spherical in shape. It is larger than the planet Mercury and slightly smaller than the planet
Mars. If it is so large compared with the bodies around it, why is it called a moon and not a planet?
A.
It is too far from the Sun
B.
c.
D.
It is smaller than Jupiter
it moves in an orbit around Jupiter
It has no gravitational pull.
Reset
Next
Answer:
It moves in an orbit around jupiter.
Final answer:
Ganymede is considered a moon instead of a planet due to its orbital relationship to Jupiter, despite its size compared to Mercury and Mars.
Explanation:
The reason why Ganymede is called a moon and not a planet despite its size compared to Mercury and Mars is that it moves in an orbit around Jupiter.
Moons are natural satellites that orbit planets, while planets orbit the Sun. Therefore, Ganymede's orbit around Jupiter classifies it as a moon, even though it is larger than Mercury and Mars.
Ganymede's classification as a moon is based on its relationship to Jupiter and its orbital behavior in the solar system.
In a paragraph, explain what effect very large small pores and their diffusion rates would have on the workings and mechanisms of a cell
Answer:
Despite differences in structure and function, all living cells in multicellular organisms have a surrounding cell membrane. As the outer layer of your skin separates your body from its environment, the cell membrane (also known as the plasma membrane) separates the inner contents of a cell from its exterior environment. This cell membrane provides a protective barrier around the cell and regulates which materials can pass in or out.
Explanation:
MARK BRAIN LIST
Answer:
Small pores are effective in cellular transportation as compared to large pores.
Explanation:
If the pores of the cell membrane become large in size then the rate of diffusion into and out of the cell would be very fast. This is not a good situation as in an organism with uncontrolled/high rate of cellular transfers could lead to death of cells. Hence small pores are effective in maintaining the required permeability , material transfers across the membrane, turbidity and water pressure for osmosis.