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SVEN [57.7K]
3 years ago
7

Identify which two of Koch's postulates would most likely not be fulfilled when trying to link a human virus to a particular dis

ease. Choose one or more: A. The microbe is found in all cases of the disease but is absent from healthy individuals. B. The microbe is isolated from the diseased host and grown in pure culture. C. When the microbe is introduced into a healthy, nonhuman experimental host, the same disease occurs. D. The same strain of microbe is obtained from a newly diseased host.
Biology
1 answer:
hammer [34]3 years ago
3 0

Answer:

 A) & B)

Explanation:

A) There are certain viruses that are present in both healthy and disease people.

Example: Polio virus is found in many human but it causes disesease in only 1% of human.

B) Viruses require host machinery for replication so they may not replicate in pure culture.

The postulate C is also violated, the virus may not produce disease in non-human experimental host because of inappropriate animal or vaccinated animal etc. Others exception includes, the same disease may be caused by various organisms and different organisms can also cause the same disease.

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What aspect of chromosome behavior most clearly accounts for Mendel's law of segregation?
svetlana [45]

The given question is incomplete as the group of choices lack the correct answer, however, the correct group of choices are as follows:

A. Movement of sister chromatids to opposite poles at anaphase II of meiosis.

B. Movement of homologous chromosomes to opposite poles at anaphase I of meiosis.

C. Crossing over between homologous chromosomes during prophase I of meiosis.

D.  Replication of chromosomes prior to meiosis.

E. Independent alignment of different homologous pairs on the metaphase I spindle.

Answer:

The correct answer is :  Movement of homologous chromosomes to opposite poles at anaphase I of meiosis.

Explanation:

The Mendel's law of segregation says that during formation of gametes the copies of genes segregate from each other so each gamete has equal and only one allele of the gene.

This behavior of homologous chromosome can be seen in anaphase I in meiosis, responsible for the segregation of copies of allele into different copies.

Thus, the correct answer is :  Movement of homologous chromosomes to opposite poles at anaphase I of meiosis.

7 0
3 years ago
The graph below represents the solar intensity measured over one day in northern Canada. What is the most likely date?
Dmitry [639]
It is important to note that the graph has 0 solar intensity for a long part of the day; around 16 hours. Only from 8 to 16 hours do we have significant sunlight.
This means that the length of day is very short during this time of the year;

The length of the day changes throughout they year; day is equal to night (12 hours each) during the solstices on March 21 and September 23 but during summer day is longer than night in the northern hemisphere; during winter it is smaller. THe smallest daylength is at December 21st (in the northern Hemisphere). This phenomenon is due to the tilt of the axis of the earth.

The correct answer is December 21; (if we talked about a place in the southern hemisphere, the answer would be March 21).
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The answer is Batholiths, D...., Sills, and Laccoliths

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