Answer:
The correct answer is the third statement.
Explanation:
Alexander Fleming was a Scottish biologist, pharmacologist, and botanist. He discovered Penicillin by accident in 1928. While performing research for determining the characteristics of staphylococci, he stacked all the research jars containing staphylococci in the corner of his lab and went to enjoy the holiday with his family.
After coming back, he witnessed that some of the jars had fungus surrounding them and the majority of staphylococci got eradicated. This marked the discovery of penicillin. It was a novel kind of medicine, which exhibited a tendency to treat infections. Thus, it can be concluded that he discovered a novel kind of medicine, which could treat infections.
Answer:
C
Explanation:
Why are bacteria good for copying large amounts of DNA?
O
A. They do not contain their own DNA.
O
B. They cannot accept DNA from other organisms.
O
C. They can reproduce very quickly.
O
D. They have a very thick cellular membrane.
Bacteria are good for copying large amounts of DNA, as they can reproduce very quickly.Therefore, the correct option is C.
What are bacteria?Bacteria are single-celled microorganisms that belong to the domain Bacteria. They are among the most abundant and diverse forms of life on Earth.They have the ability to rapidly copy DNA due to their fast replication rates. They can divide and produce offspring every 20–30 minutes under optimal conditions, allowing them to copy large amounts of DNA in a short period of time.
This makes them useful in a variety of molecular biology techniques, such as the amplification of DNA through polymerase chain reaction (PCR) or the production of large quantities of recombinant DNA using bacterial cloning vectors.Therefore, the correct option is C.
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Other than bacteria, which factor leads to nitrogen fixation? A. Lightning B. Flood C. Rain
Answer:
A. Lightning
Explanation:
Nitrogen is very fundamental for a wide range of life activities in both plant and animals.
Lightning which accompanies thunder during rain storm and other weather phenomenon aids the release of atmospheric nitrogen for life processes. The energy that accompanies a lightning event is mostly electrical in nature. This electrical energy is huge and very massive. As the lightning interacts with free nitrogen molecules in the atmosphere, the molecule is broken down. The free nitrogen which results then combines with oxygen in the atmossphere to form oxides of nitrogen. When oxides of non-metals dissolves in rain water, they make the water rich in nitric acid and can be brought to the biosphere for use by plant and animals.
Which of the following is a cause of a DNA mutation?
O
A. The linking of amino acid subunits into a long chain
O
B. The transcription of DNA into RNA
O
C. An error in the repair of damaged DNA
D. The diffusion of molecules across the cell membrane
SUBMIT
Answer:
(C). An error in the repair of damaged DNA.
Explanation:
DNA mutation can be defined as permanent changes in genetic material due to alteration in nucleotide sequence. Mutations can occur randomly during replication or can be induced by exposure to mutagens (mutation causing agents).
During DNA replication, various errors take place due to incorporation of incorrect nucleotide base in growing DNA strand and form damaged DNA. These errors are generally repaired by DNA-repair systems of cell.
However, if the damaged DNA is not repaired due to errors in DNA-repair system due to problems, the DNA would become mutated.
Thus, the correct answer is option (C).
Which of the following describes the role of cyclic AMP (cAMP) in hormone response?
A. cAMP are molecules that bind and captures the nonsteroid hormone.
B. cAMP receives messages from mRNA to begin protein synthesis.
C. cAMP receives a message from a nonsteroid hormone and carries the message into the cell.
D. cAMP opens a pore for steroid hormones to enter the nucleus
Answer:
B
Explanation:
Answer:
C. cAMP receives a message from a nonsteroid hormone and carries the message into the cell.
Explanation:
Water soluble hormones, the non-steroid hormones bind to their cell surface receptors to activate the G protein. The activated G protein activates adenylyl cyclase which in turn leads to the formation of cAMP from ATP. The cAMP activates protein kinases which in turn phosphorylates the cytoplasmic proteins. The activates cytoplasmic proteins bring about the desired response.
In this way, the cAMP second messenger system delivers the information from hormones to the cell via cAMP.
what are main treatments for cancer
Answer:
- Surgery
- Chemotherapy
- Radiation Therapy
- Immunotherapy
- Targeted Therapy
- Hormone Therapy
However some people may have no treatments, depending on the cancer.
Explanation:
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brian made this table to organize his notes on changes of state
change of state energy change
melting gain
freezing lose
deposition gain
condensation lose
Answer:
B. Deposition Gain
Explanation:
Many people try to eliminate fat from their diets. Which is one reason it is necessary for humans to eat fat?
A. Eating fat is the fastest way to get energy.
B. Fat eliminates triglycerides from the body.
C. Saturated fats clear out the blood vessels.
D. Fat helps nerves transmit signals.
please helppp, this is for APEX in summer school.
Answer: Option D
Explanation:
The fat which is found inside the body helps in providing insulation to the body form the outer environment. It also serves many important functions in the body such as protection from cold by providing heat to the body.
The fat is also found in the myelin sheath of the neurons. This helps in saving the energy which is transmitted from one neurons to another neuron.
It provides a long route for signal transmission without wasting energy by providing insulation.
Hence, the correct answer is option D
Fats are essential in the human diet as they help in the formation of the insulating layer around nerve cells, promoting efficient transmission of signals across neurons.
Explanation:It is vital for humans to consume fats in moderation because they play fundamental roles in the body. The correct answer to the question is option D: Fat helps nerves transmit signals. This is because fats participate in forming the myelin sheath, a fatty insulating layer protecting our neurons (nerve cells) and aiding in the swift and efficient transmission of signals in our nervous system. Without enough fat in our diet to facilitate this, our neurological health might be compromised.
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Internal gestation followed by live birth is an evolutionary development most likely driven by which of the following?
A. The need to give birth and reproduce on dry land where eggs could dry out
B. Environmental conditions caused eggs to over-absorb dangerous molecules from the environment
C. The inability of eggs to acquire nutrients to grow complex animals
D. The threat of predators to eat eggs
Internal gestation and live birth in animals are evolutionary developments likely driven by the need to reproduce in dry terrestrial environments where eggs could dry out and by the threat of predators who pose significant risks to eggs. These strategies could ensure survival of offspring by preserving a moist environment and offering protection against predators.
Explanation:Internal gestation followed by live birth is an evolutionary development that likely occurred for several reasons. The most compelling of these can be seen in options A and D from your question, i.e., the need to reproduce on dry land where eggs could potentially dry out and the defense against predators who pose a threat to laid eggs.
Option A addresses the environmental constraints encountered by land-dwelling species. Eggs, when left exposed, could rapidly lose moisture and become inviable in dry terrestrial environments. Accordingly, a strategy of internal gestation could help in preserving a moist environment for the developing embryo, leading to the evolution of live birth.
Option D pertains to predation pressure. Eggs, whether in water or on land, are highly vulnerable to predators. Thus, keeping the young ones inside the body until they are sufficiently developed could be a defensive strategy against predation.
Although factors mentioned in options B and C (absorption of harmful molecules and inefficient nutrient acquisition) might have played a role too, A and D seem to be the stronger drives evolutionary-wise.
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The evolutionary development of internal gestation and live birth is most likely driven by a combination of factors, including the threat of predation, the need to reproduce in harsh environments, and to shield developing embryos from harmful substances.
Explanation:The evolution of internal gestation followed by live birth is most commonly understood within the context of predation and harsh environmental conditions. Both A and D options suggest plausible causes. The evolution of internal gestation can be seen, in part, as a strategy to give the embryo a safer environment that is shielded from predators and environment risks (drying out, for instance). Furthermore, in adverse conditions, eggs could absorb harmful substances from surroundings. The mutually exclusive nature of these answers suggests that the particular evolutionary route may have been influenced by a combination of factors.
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which best describes meiosis?
A. it produces cells that are identical to the original cell
B. it is responsible for the replacement of damaged skin cells
C. it is responsible for growth of the organism
D. it produces male and female sex cells
Answer:
It is: D. it produces male and female sex cells.
Explanation:
Answer:
D. it produces male and female sex cells
Explanation:
Hope this helps!
The skeletal system performs a variety of functions that are crucial to maintaining life processes. What function is performed in
the bone marrow, but not in the ossified bones of the skeleton?
a oxygen transportation
C mineral storage
b. muscle attachment
d red blood cell production
Answer:
Red blood cell production
Explanation:
Marrow makes blood and it is then sent to heart and lungs to be filled with oxygen
A student sees several ants walking up a wall following the exact same trail that an ant took earlier. She wants to apply the scientific method to determine how the ants detected the trail. Which of these steps would come first in her application of the scientific method?
Perform an experiment by cleaning the scent away from part of the trail.
Draw a conclusion that the ants follow a scent trail.
Make a prediction about what the ants will do after she cleans away part of the trail.
Hypothesize that the ants are following a scent trail that the first ant left.
Answer:i think its answer C
Explanation:
Answer:
Hypothesize that the ants are following a scent trail that the first ant left.
Explanation:
The scientific method can be defined as the manner or set of ground rules employed in a scientific investigation in order to obtain the most reliable results as possible. However, the scientific method is somewhat more subjective, or implicit, in the scientific way of thinking than a manual with explicit rules about how the scientist or another should act.
Generally, the scientific method includes some steps such as observation, hypothesis formulation, experimentation, interpretation of results and, finally, conclusion. The student, exposed in the question, already made the observation, when he realized that ants do exactly the same track as an ant did before; The next step in the scientific method this student must do is to create a hypothesis. This student's hypothesis should ask whether ants are following a scent trail the first ant left.
What is a group of organisms that are closely related and share similar characteristics a) species B)genus c)taxonomy D) similar organisms
Answer: b genus
Example: homo sapiens and homo neanderthalus. diffrent species same genus
Final answer:
A group of closely related organisms that share similar characteristics is known as a species. This classification is based on the capability of organisms to exchange genes, interbreed, and produce fertile offspring, indicating significant genetic similarity and morphological traits in common. Taxonomy classifies these organisms into hierarchical categories, with species being the most specific.
Explanation:
A group of organisms that are closely related and share similar characteristics is known as a species. Members of a species are capable of exchanging genes or interbreeding and they produce viable, fertile offspring. These organisms share significant genetic similarities, and their classification within this group suggests they can generate fertile progeny with each other and have an adequate number of morphological traits in common.
When it comes to taxonomy, organisms that are a part of the same clade have evolved from a shared ancestor. This indicates a close evolutionary relationship, and clades are groups of organisms that are classified together based on this concept in phylogenetic classification systems.
Moreover, one of the strongest arguments supporting that two organisms, A and B, are closely related evolutionarily is if the DNA sequences of A and B are highly homologous. This genetic homology points to a common ancestry and shared evolutionary paths.
In the context of taxonomy, the taxonomic classification system uses a hierarchical model to organize living organisms, where each sublevel indicates that the organisms are more similar to each other. The broadest category in this system is the domain, which is then followed by more specific categories such as kingdom, phylum, class, order, family, genus, and ends with species being the most specific.
A scientist is trying to determine how closely related a moth species is to four other moth species. He examined the DNA of each species and compared it to the study subject. He then created this table. Species # of genetic differences Species A 12 Species B 3 Species C 14 Species D 28 Which species is most closely related to the original moth species? species A species B species C species D
Species B is the most similar to the original moth due to its lack of differences in DNA. We know that 12, 14, and 28 are all greater than 3 (and represent the amount of genetic differences), which makes B the only one with a high quantity of similarities.
I hope I helped!
Species B is the most similar to the original moth species and is denoted as option B.
What is DNA?
This is known as deoxyribonucleic acid and contains the genetic components of an organism.
The lack of differences in DNA is what makes species B the only one with a high quantity of similarities.
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After a signal is transmitted from the eyes through the optic nerve, which part of the brain processes the visual information?
A. The limbic lobe
B. The occipital lobe
C. The frontal lobe
D. The temporal lobe
Answer:
B. The occipital lobe
Explanation:
The brain receives signal or information for vision through one of the five senses, the eyes. The brain processes the visual information in the occipital lobes of the cerebrum. The occipital lobes are one of the four main lobes of the cerebral cortex. The eyes transmit this information to the visual cortex. The visual cortex takes processes the information so, we are able to see the things.
Why do mutations in genes affect traits?
O
A. Genes determine what type of mutagens an organism has.
O
B. Genes produce proteins that cause traits.
O
C. Genes affect how many chromosomes an organism has
O
D. Genes code for carbohydrates that influence traits.
Answer:
B. Genes produce proteins that cause traits
Explanation:
A P E X
During which succession do new species move into an area and colonize it?
During____
succession, new species move into an area and colonize it.
During primary succession, new species move into an area and colonize it which is bare before its entry.
What is Succession?Succession may be defined as the process of gradual and continuous replacement of one community by another community over a long period of time.
Primary succession is always initiated in the bare area where no life has existed before.
Therefore, it is well described above.
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How does interphase prepare cells for mitosis
Final answer:
Interphase prepares a cell for mitosis through its three stages: the G1 phase, where the cell grows and accumulates resources; the S phase, where DNA is replicated; and the G2 phase, where the cell continues to grow and checks DNA replication readiness. This ensures a healthy cell division.
Explanation:
Interphase Prepares Cells for Mitosis
Interphase is critical for preparing a cell for mitosis. This phase consists of three stages: G₁ (First Gap), S (Synthesis), and G₂ (Second Gap).
The G₁ phase is marked by intense biochemical activity where the cell accumulates the building blocks of chromosomal DNA, related proteins, and energy reserves. During the S phase, the cell synthesizes a complete copy of the DNA in its nucleus. This DNA replication is essential for providing each daughter cell with an identical set of chromosomes during mitosis. In the G₂ phase, further growth occurs, and the cell ensures all the DNA is replicated and begins to reorganize its contents to prepare for mitosis. These steps are crucial as they ensure that the cell is ready to enter the mitotic phase where cell division will occur, resulting in the formation of two genetically identical daughter cells.
In animal cells, an additional preparatory event occurs: the duplication of the centrosome, which is vital for the later stages of mitosis, ensuring that the cell's cytoskeleton is properly organized for division.
Which equation best represent the process of photosynthesis
Answer:
6 CO2 + 6 H2O → C6H12O6 + 6 O2
Explanation:
Answer:
The answer is: 6 CO2 + 6 H2O → C6H12O6 + 6 O2
Explanation:
Photosynthesis is the process in which the energy of light is converted into chemical energy in the form of sugars. In a process driven by the energy of light, glucose molecules (and other sugars) are created from water and carbon dioxide, while oxygen is released as a byproduct.
Light
6 CO2 + 6 H2O -------------- → C6H12O6 + 6 O2
Nutrients (Sugars)
The answer is: 6 CO2 + 6 H2O → C6H12O6 + 6 O2
what is a specific technique used to produce gmo tomatoes
Answer:to reduce the amount of bug that are in the fruit
Explanation:
PLZ HURRY IT'S URGENT!
Which is the correct balanced equation that shows the process of iron oxide (Fe2O3) explosively combining with aluminum (Al) to produce iron (Fe) and aluminum oxide (Al2O3)?
A.
Fe2O3 + Al → Fe + Al2O3
B.
Fe2O3 + 3Al → 3Fe + Al2O3
C.
Fe2O3 + 2Al → 2Fe + Al2O3
D.
2Fe2O3 + 2Al → 2Fe + 2Al2O3
Answer:
C. Fe2O3 + 2Al → 2Fe + Al2O3
can any one help?????
Answer:
D
Explanation:
Just remember immigration the i= into
emigration the e=exit
Hope this helps??
18. Over time, how do sand dunes tend to migrate?
a. perpendicular to the movement of the wind
b. in the same direction as the wind blows
c. toward the wind
d. in random directions
Answer:
in the same direction as the wind blows
Explanation:
The dunes are hills formed by grains of sand held together by the action of wind or water. Over time, as sand dunes tend to migrate in the same direction as the wind blows.
They have a larger side that is eroded (windward) and a smaller, steeper side (leeward) where deposition of eroded material occurs. Through this mechanism of erosion and deposition the dunes are considered highly dynamic, "moving" over time.
It is not possible for global warming to have any positive side effects. Please select the best answer from the choices provided T F
the answer is F. there is a brightside to everything no matter how small
Answer: False
Explanation:
The global warming is a phenomena in which the increase in the abundance of greenhouse gases like carbon dioxide, methane, water vapor, nitrous oxides and ozone results in the rise in the average temperature due to the fact that these gases trap heat from sunlight. This affects the change in the climatic condition of a region. This entire phenomena is called as greenhouse effect. This results in the melting of glaciers, acidification of oceanic water and other problems.
The positive effects of global warming includes increase in carbon dioxide gas will increase the rate of photosynthesis which may lead to increase in productivity of crops, and increase in planktonic biomass in ocean.
How are the reproductive cycles of a fungus and a pteridophyte similar?
A)Both organisms form fruiting bodies that produce diploid seeds.
B)Both organisms produce haploid spores and exhibit diploid and haploid stages.
C)Both organisms reproduce sexually when two haploid hyphae fuse.
D)Both organisms exhibit a diploid stage and are only able to reproduce asexually.
Answer:
i think it is D
Explanation: they both reproduce asexually
Answer:
The correct answer is option B.
Explanation:
The sporophytes in pteridophytes is the haploid stage and generate spores. The diploid stage in pteridophytes may take place when two spores combine and give rise to a prothallus, that is, the diploid stage of the pteridophytes.
A fungus to generate spores by the sporangiophores, its haploid stage. However, on certain occasions, two horizontal hyphae between the two species of fungi, may combine at the tips and generate a zygote via plasmogamy and karyogamy.
Based on what you have learned, what kinds of living and nonliving things do you think a marine biologist studies? What are some questions that biologists might ask about the living things they study?
Answer:
A marine biologist study organisms from minute phytoplanktons to huge and gigantic blue whale. A marine ecosystem contains thousands of species of organisms that are study topic of a marine biologist.
Marine biologists study the interaction of these species with their environment. The non-living things that scientific study is about the effect of change in temperature, pH, oxygen quantity, light, acidity, salinity on marine species.
Some questions that biologist ask about living things they study are :
- how many marine species are in the endangered list?
- what is the role of a species in its ecosystem?
-how the extinction of a species affects the food chain in the ecosystem?
The double helix structure of DNA
Answer:
The double-helix structure of DNA: Watson, Crick, Franklin
The chemical composition of proteins: Mulder
The monomer of nucleic acids: Levene
Match each medication with its description.
antiacids- acid in stomach
anticoagulants- reduces blood clots
antiemetics- prevent vomiting
what causes the atmosphere to be unequally heated by the sun?
a. the jet stream
b. local winds
c. earths tilted axis
d. el niño
Answer:
C
Explanation:
The Earth's tilted axis is the primary reason for unequal heating of the atmosphere by the sun. This tilt causes different amounts of sunlight to reach different latitudes throughout the year, leading to seasonal variation in climate.
Explanation:The primary factor that causes the atmosphere to be unequally heated by the sun is the tilt of the Earth's axis. This tilt, amounting to roughly 23.5 degrees relative to its orbit around the Sun, creates different zones of climate on the planet by causing differing amounts of sunlight (and hence, heat) to reach different latitudes throughout the year.
When the Earth's axis tilts towards the Sun, it's summer for that pole, and winter when it tilts away. This is the reason for seasonal variation in climate. Factors like the jet stream, local winds, and El Niño can further modify local weather conditions, but the unequal heating is primarily due to the Earth's tilted axis.
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where do plants store the energy formed by photosynthesis?
a. in the chloroplast membrane
b. in the thylakoids membrane
c. in chemical bonds
d. in protons
Answer:
A
Explanation:
Im not 10p%sure but the chloroplast should be correct
During a natural disaster, part of a plant was damaged. If the plant can no longer grow, and produce new root cells, which part of the plant likely suffered damage?
Final answer:
Damage to the plant's meristems, specifically the roots, is likely the cause of its inability to grow and produce new root cells. The roots are key for absorbing water and nutrients, and when they are damaged, the plant may not be able to survive due to restricted resource uptake.
Explanation:
When a plant can no longer grow or produce new root cells, it is likely that the meristems, particularly the root meristems or root apical meristems, suffered damage during the natural disaster. Meristems are regions in the plant where cells are capable of dividing and differentiating into various types of plant cells. If root meristems are damaged, the plant cannot produce new root tissue, which affects its ability to absorb water and nutrients from the soil. This can lead to the entire or major portion of the plant dying because the roots are essential for plant survival, anchoring the plant in the soil and facilitating the uptake of vital resources.
Generally, damage to the roots can come from various factors such as extreme temperatures, physical trauma, or chemical exposure. Cold damage to the root system, for example, can blacken or spongify roots and prevent new growth, which becomes evident by restricted water and nutrient uptake, leading to symptoms such as defoliation or small leaf size.