The correct answer is the cluster sample is obtained by selecting individuals who are easily contracted rather than who voluntarily respond because cluster sampling is a way of dividing a group then the individual responsible for picking from the selected population will select people from the cluster in which is easily contacted.
Answer:During attachment and penetration, the virus attaches itself to a host cell and injects its genetic material into it. During uncoating, replication, and assembly, the viral DNA or RNA incorporates itself into the host cell's genetic material and induces it to replicate the viral genome.
Explanation:
Answer - D. Frameshift Mutation
Reasoning - This is a genetic mutation which is caused by nucleotides/indels that is not divisible by three.
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A urease test is used to identify <em>Myobacterium tuberculosis</em><em> </em>because urease is a sign of tuberculosis. Thus, the correct option is A.
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What is tuberculosis?</h3>
<em>Mycobacterium tuberculosis</em> is the bacteria that causes tuberculosis (TB). It is disseminated when a person with active tuberculosis in their lungs coughs or sneezes and someone else inhales the TB bacteria-laden droplets.
The lack of urease enzymes in humans makes urease-based diagnostics appealing. As a result, the presence of urease enzyme activity in humans indicates the presence of a urease-positive microbial pathogen or commensal.
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Answer:
All white-flowered snapdragons in the F1
Explanation:
The cross described above is an example of a monohybrid cross involving a single gene coding for flower colour in snapdragon plants. According to the question, one allele codes for red flower, while the other for white flower.
When both red and white flowered plants were crossed, an all pink-flowered plants resulted in the F1 generation. This is due to INCOMPLETE DOMINANCE, which is a genetic scenario whereby an allele does not completely mask the expression of another in an heterozygous state, instead they form a third phenotype that is intermediate to both parental phenotypes.
But in the case of crossing two white-flowered snapdragons, all the F1 offsprings will be white-flowered because the parents are homozygous i.e. contains the same alleles.
For example, RR (red flower) is crossed with rr (white), to produce an heterozygous/hybrid Rr (pink).
Hence if rr (white) and rr (white) crosses, all rr (white) offsprings will result.