How big are viruses? A. Big enough to be seen by the naked eye but smaller than a human egg cell. B. Too small to be seen without the aid of an electron microscope. C. Too small to be seen without the aid of a light microscope. D. Big enough to be seen when cultured like bacteria.
Most viruses are much smaller than bacteria and cannot be seen without an electron microscope, making them too small to be visible with a light microscope or to the bare eye.
Viruses vary widely in size, with most virions, or single virus particles, being very small, about 20 to 250 nanometers (nm) in diameter. Due to their small size, viruses are too small to be seen without the aid of an electron microscope. Even with the discovery of larger viruses, such as those up to 1000 nm in diameter, the majority cannot be seen with a light microscope. A typical virus, like the influenza virus, is approximately 100 nm, making it much smaller than a typical bacterium, which is around 1 µm (1000 nm), and at least ten times smaller than a typical plant or animal cell, which ranges from 10 to 100 µm (10000 to 100000 nm).
An object must generally measure about 100 µm to be visible without a microscope, which is far larger than a typical virus. Therefore, the answer to the student's question on how big viruses are is B: Too small to be seen without the aid of an electron microscope.
Choose the three possible answers that could explain how alleles expressed in heterozygotes interact to make a third phenotype, different from either homozygote.
There is a dominant relationship between alleles.
There is a codominant relationship between alleles.
There is an incomplete dominance between alleles.
The trait is polygenetic in nature.
If embryonic testes do not produce testosterone, a genetic male develops female external genitalia. however, if embryonic testes properly produce testosterone, but a genetic male nevertheless develops female external genitalia, the cause could be ______.
If embryonic testes properly produce testosterone, but a genetic male nevertheless develops female external genitalia, the cause could be a mutation in the gene that codes for the testosterone receptor.
Mutation of gene means, change in the sequence of DNA (deoxyribonucleic acid). A genetic disorder is a condition when mutations occurred in one or more genes.
Based on the graph above, how well will the enzyme perform as a catalyst when placed in a pH 7 solution, such as water?
It will perform optimally because the pH conditions are optimal.
It will perform poorly because it will immediately denature.
It will perform optimally because it will not denature.
It will perform less than optimally unless the pH was increased.
Answer: "It will perform less than optimally unless the pH was increased."
Explanation:
Which of the following is a method used to prevent soil depletion?
a-Dune fences
b- Contour farming
c-Adding fertilizers
d- Planting grasses on slopes
i believe it is b dont know for sure please help
Contour farming is the correct answer, as it involves plowing and planting along land contours to reduce soil erosion and prevent soil depletion.
The method used to prevent soil depletion is b- Contour farming. Contour farming involves plowing and planting crop rows along the natural contours of gently sloping land, which helps to slow water runoff, inhibit the formation of channels of water, and limit soil erosion. This practice is particularly effective on slopes in the 3-8% range. Other soil conservation techniques include terracing, strip cropping, using cover crops, and conservation tillage, each of which contributes to reducing soil loss and enhancing soil fertility.
Alcohol's lack of digestion and almost immediate introduction into the bloodstream accounts for the rapid onset of impairment when you consume alcohol.
a.true
b.false
A drug that is made from anesthetic which is a common ingredient in pesticides is known as
Which of the following is carried out in the Golgi apparatus of the cell?
A.) Digestion of large molecules
B.) Cellular respiration
C.) Protein synthesis
D.) Protein modification and storage
d. protein modification and storage
The rise of oxygen concentration in the modern atmosphere is partially due to the preservation of organic matter before it could _____.
What is the name of the surgical procedure for the rearrangement of the nasal septum?
which of the following is a pseudocoelomate fish shrimp roundworm all of the above
The first visible signs of senescence are usually observed in a person's ___
Answer:
Skin
Explanation:
In simple terms senescence is the process of aging, biologically it is the stage whereby cell division ceases. Senescence is caused by:
Telomere damageDNA damagedeteriorated mitochondriaEpigenetic abnormalityIn humans, the allele for having dimples is dominant to the allele for not having dimples. What would you expect to see in the offspring of a woman with dimples who is homozygous (DD) and a man who is heterozygous (Dd) for the trait?
The color that symbolizes sorrow for sin and repentance and is used during lent is
The color associated with sorrow for sin and repentance used during Lent is purple, which has historical religious significance.
The color that symbolizes sorrow for sin and repentance, and is used during Lent, is purple. This association comes from the fact that, historically, Catholic priests would wear purple robes during Lent, a period of reflection and penance in the Christian liturgical year. In the context of religion and symbolism, purple has long had a connection to sorrow and repentance, which aligns with its use during Lent. Additionally, purple is a color traditionally worn by royalty and carries connotations of suffering related to the Passion of Christ. Understanding the cultural and religious significances of colors helps to illuminate the reason for the color's symbolic weight in Lent.
Which process allows a species to produce new generations of individuals?
Answer:
Meiosis
Explanation:
Meiosis is the process that allows a species to produce new generations of individuals, because meiosis is the complementary process to fertilization, which allows the number of chromosomes of a species to remain constant over generations.
Meiosis refers to the process of cell division through which a cell has its chromosome number halved. By this process gametes (animals) and spores (plants) are formed. It consists of two consecutive divisions, called Meiosis I and Meiosis II. Both are subdivided into four phases, which have the same name as mitosis.
Most marine animals live near the surface of the ocean because of ________, which supports photosynthesis by marine algae that form the basis of the food chain.
Marine animals predominantly live near the ocean's surface because light is available there for photosynthesis, which is necessary for the growth of marine algae, the food chain's base. The region with sufficient light is known as the photic or euphotic zone. Nutrients are recycled through ocean upwelling, supporting this dynamic ecosystem.
Most marine animals live near the surface of the ocean because of light, which supports photosynthesis by marine algae that form the basis of the food chain. The photic or euphotic zone, which extends down to about 200 meters, is where there is sufficient light for photosynthesis. This region supports a vast array of marine life since plant life can only exist where light is available to drive photosynthesis, and these plants are a primary food source for many marine animals. Once organisms die, they fall to the deeper parts of the ocean, and their nutrients can eventually be recycled through processes like ocean upwelling, which brings nutrients from the depths back to the surface waters where they can be used by photosynthetic organisms again, thereby supporting the marine food web.
Which of these statements best proved that electromagnetic forces are weaker than strong nuclear forces?
What was the first period of the Paleozoic era?
1.Siberian
2.Precambrian
3.Ordovician
4.Cambrian
The correct answer is (d) Cambian
The first period of Paleozoic era was Cambian period which lasted from 541 million years ago to 485 million years. This period was marked as a boom in evolutionary history by the event named as Cambrian Explosion. In this event a large number of creatures evolved in any single period of the Earth. creatures like algae and arthopods like trilobites. All the marine phyla also evolved during this period.
Scientists have believed for many years that marine temperatures drop as ocean depth increases. What experimental method would best test this hypothesis, and why?
a.Bring samples of ocean water from various depths to the lab and measure the temperature of each sample, because this most directly measures water temperature
b.Send a robot to measure the temperature of the ocean at various depths and plot the data on a graph, because ocean temperature may change with depth
c.Capture fish from various ocean depths and measure the temperature of their tissues, because this directly measures the temperature of living systems
d.Collect rocks from various ocean depths and determine what temperature was present during the rocks' formation, because rocks do not change once they are formed
Answer:
b. Send a robot to measure the temperature of the ocean at various depths and plot the data on a graph, because ocean temperature may change with depth
Explanation:
Remember that in a scientific experiment we are supposed to validate or reject our hypotesis, in this case we must determine if water's termerature of the ocean changes depending of the depth. The hypotesis would be: As ocean depth increases, water temperature drops.
The only way to validate or reject this is to measure the temperature of water at different depths. Option B is the only one that gives us this possibility, technology allows us to send a robot into the ocean and submerge measuring the different temperatures.
The other options take the subject of study out of the controled zone, by extracting water or a fish from the depths and measuring it's tempreature, we take the risk that other factors, such as surface's temperature, affect the result.
The process of injecting water, sand, and chemicals under high pressure into rocks to release oil and natural gas is known as
How many different phenotypes are possible in a one gene/three allele system that displays codominance to each other?
3 homozygous and 3 heterozygous
combinations. Each unique combination of two alleles results in a distinct
phenotype. Possible combinations are:
a1/a1
a1/a2
a1/a3
a2/a2
a2/a3
a3/a3
While walking in the forest, you see a plant with a flower that has three petals and leaves with parallel veins. what type of plant is this?
the process used to convert seawater into fresh water is known as
Answer:
The answer is: Fresh water is obtained by desalination of seawater.
Explanation:
Desalination plants, also known as desalination plants, are industrial facilities intended for desalination, usually of seawater or salty lakes, to obtain drinking water.
The answer is: Fresh water is obtained by desalination of seawater.
The process used to convert seawater into fresh water is known as desalination.
Desalination is the process of removing salt and other impurities from seawater to make it suitable for various purposes, including drinking, irrigation, and industrial use.
There are several methods of desalination, including reverse osmosis, multi-stage flash distillation, and electrodialysis, among others.
These methods employ different mechanisms to separate the salt and other minerals from the seawater, resulting in the production of fresh water.
Desalination plays a crucial role in addressing water scarcity in regions where access to fresh water is limited, especially in arid coastal areas.
Thus, the answer is desalination.
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Chemical bonds found in living systems do not normally include __bonds
Which is the best description of the skin senses?
The skin senses, also known as the somatosensory system, are responsible for detecting and relaying information about various sensations from the skin and other tissues of the body to the brain.
These sensations include touch, pressure, pain, temperature, and proprioception (awareness of body position and movement). The skin is the largest organ of the body and plays a crucial role in our interactions with the external environment.
The best description of the skin senses would be:
"The skin senses are a complex system that allows the human body to perceive and respond to various external stimuli. They encompass a range of sensations, such as touch, pressure, pain, temperature, and proprioception. These sensations are detected by specialized nerve endings (receptors) distributed throughout the skin and other tissues. The sensory information is then transmitted through nerve pathways to the brain, where it is processed and interpreted, enabling us to navigate and interact with our surroundings effectively."
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A __________ is a fundamental physical and functional unit of heredity.
A gene, made up of DNA, is the fundamental physical and functional unit of heredity. They act as instructions to produce proteins, and their function greatly influences an organism's traits and growth.
Explanation:A gene is a fundamental physical and functional unit of heredity. Genes, which are made up of DNA, act as instructions to make molecules called proteins. In humans, genes vary in size from a few hundred DNA bases to more than 2 million bases. The Human Genome Project has estimated that humans have between 20,000 and 25,000 genes.
On a more detailed level, a gene is a segment of DNA that is coded for a specific function or a set of functions. Its sequence of DNA bases determines the structure of the protein or proteins it can produce. A gene's function can greatly affect an organism's characteristics and growth processes.
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Which characteristic describes a mature river?
A. Has a steep stream gradient
B. Has many tributaries
C. Is near headwaters
D. Is in a straight and narrow V-shaped channel
Answer: B. Has many tributaries
A river is a water body which in which water is originated from different sources like like lake, melting glaciers, rainwater, groundwater. All rivers join to these sources of water and these sources are called as tributaries which combine to form headwater. A young river will have few tributaries that is it will originate from few water sources but a mature river will have many tributaries.
The limbic system of the brain is responsible for _____.
Feelings, Fear, and Pleasure.
Which carbohydrate can be used by the body as an immediate source of energy?
Answer:glucose
Explanation:
What is a complex protein-iron compound in blood that carries oxygen to cells?