What are the 2 ways that you can do to enhance the resolvingpower on the microscope?
The resolving power of the microscope is dependent upon the objective lens. It can be measured by the ability of the lens to differentiate between the two lines or points on the specimen under observation. The more the resolving power the smaller will be the distance between the two lines or points that can be distinguished.
The following are the two ways that can be used to enhance the resolving power on the microscope:
Using a lens that has a higher aperture.
Decreasing the amount of light being entered into the microscope that means using light of less wavelength.
Steve has had a stroke and comes to you for follow-up today. On examination you find that he has increased muscle tone, some involuntary movements, an abnormal gait, and a slowness of response in movements. He most likely has involvement of which of the following? A) The corticospinal tract B) The cerebellum C) The cerebrum D) The basal ganglia
D) The basal ganglia
Basal ganglia is located at the base of forebrain and the top of midbrain. It is involved in many functions because it is connected to many parts of the brain like thalamus and cerebral cortex. One of the functions of basal ganglia is to control the voluntary movements of the skeletal muscles.
Damage to basal ganglia can disturb the muscles causing involuntary movements, abnormal gait and increased muscle tone. For example, muscle tone is the tension in skeletal muscles caused due to minor involuntary contractions. Substantia nigra part of basal ganglia is responsible for controlling it. If it is damaged, muscle tone can increase which will cause unnecessary tension in skeletal muscles leading to uncontrolled movements.
Which of the following is/are true? A. Sympatric speciation is best described as a random event that disrupts the allele frequencies in a population. B. Red headed females in a population will only breed with red headed males. The yellow headed females will only breed with yellow headed males. The red and yellow populations live on separate continents and rarely met in nature. The red and yellow could breed and produce fertile offspring but they normally do not. This would be an example of sympatric speciation. C. Sympatric speciation does not require geographic isolation. D. Red headed females in a population will only breed with red headed males. The yellow headed females will only breed with yellow headed males. This population lives in the same geographic area. The red and yellow individuals could breed and produce fertile offspring but they normally do not. This would be an example of sympatric speciation. E. Sympatric speciation can be due to sexual(mate) selection
Answer: Options A, C and E are correct
A) Sympatric speciation is best described as a random event that disrupts the allele frequencies in a population
C) Sympatric speciation does not require geographic isolation.
E) Sympatric speciation can be due to sexual(mate) selection
Sympatric speciation is the situation whereby organisms of the same species:
- live in the same territory or nearby territories ( i.e not living in isolation)
- DO NOT interbreed, but select a sexual mate from a much diverse territory which results in an uneven gene flow or disruption of alleles in new species or offsprings of such parents organisms.
Erythrocytes might the best of example of form equals function because they lack many organelles. What organelles are absent in erythrocytes?
Mature mammalian red blood cells lack nuclei, mitochondria and rough endoplasmic reticulum, they do not contain DNA and consequently, cannot divide. They also cannot synthesise RNA nor synthesise any new proteins, and consequently, have a limited lifespan. Mature red blood cells circulate for about 100–120 days in the body before they are removed by the spleen.
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Compare epidemic and murine typhus.
The major differences between murine and epidemic typhus are their infection mode.
Typhus is a fever disorder that can be endemic or epidemic in nature. Both disorders are pathological and sociologically similar. Endemic typhus is also called as murine typhus.
murine typhus includes several symptoms such as high fever, rashes on the trunk of the body, nausea, diarrhea, and vomiting and infects by the flea feces contact to cut or open wound.
Epidemic typhus is a similar disorder but with more serious symptoms, including hypotension, bleeding into the skin, delirium, and death and spread by infected body lice.
Thus, the major differences between murine and epidemic typhus are their infection mode.
What type of powerful storms is Mercury subject to and where do they come from?
Mercury is wracked by intense magnetic disturbances more extreme than any on Earth, new research suggests
the small, rocky planet also experienced volcanic activity for much longer than once thought, according to several new studies base don observations during the latest flyby of the small, rocky planet by a NASA spacecraft.
PLEASEE HURRYYY WORTH 10 POINTSWhich pieces of information does the National Weather Service produce?
simple maps newspaper maps long-range forecasts maps with isotherms