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zalisa [80]
3 years ago
9

Help in this biology work please

Biology
1 answer:
noname [10]3 years ago
5 0

Answer:hi

Explanation:

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A researcher is viewing a cell that has cell walls. Which question would BEST help the researcher to narrow down the taxonomic g
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Does it have a nucleus?

Explanation:

Bacteria and Archaea have cell walls but no nuclei

Plant cells (Eukarya) have cell walls and a nucleus.

But remember not all eukaryotes have cell walls

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Name the two types of vectors.
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3 years ago
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The bacteria have an initial concentration of 1000 cells/cm3 . Each cell divides once every 30 minutes. Calculate how long it wi
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It will take <u>120 minutes</u> for the concentration to become > 15000 cells/cm³

<u>Given data:</u>

Initial concentration ( density ) = 1000 cells / cm³

Target/final concentration = > 15,000 cells /cm³

<h3 /><h3>Calculating the concentration every 30 minutes </h3><h3 />

<em>note</em><em> : Given that each cell divides every 30 minutes </em>

  • <u>After the first 30 minutes </u>

Concentration = 2000 cells / cm³

  • <u>After 60 minutes </u>

concentration = 4000 cells / cm³

  • <u>After 90 minutes </u>

concentration = 8000 cells / cm³

  • <u>After 120 minutes </u>

concentration = 16000 cells / cm³

Therefore after 120 minutes the concentration of the cells will be greater than 15000 cells/cm³ ( i.e. 16000 cells/cm³ )

Learn more about concentration : brainly.com/question/17206790

4 0
2 years ago
If you eat food while hanging upside down do you think it will go through alimentary canal? Give reason
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No it will not bwecause there are two valves
5 0
3 years ago
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"Antigenic Shift" is a characteristic of the causal agent of the Influenza. It is the result of a major change in the antigenic
gtnhenbr [62]

Answer:

True.

Explanation:

Antigen may be defined as the chemical that has the ability to evoke the  and immune response and can harm the living organisms. The specific antibody are produced against the immune response.

The antigens has evolved different mechanisms to prevent themselves from them the immune system of the host. The antigenic shift is the most common change that might occur in viruses that helps the antigen to protect itself by changing its genetic material. No anti viral drugs are available for the viruses.

Thus, the answer is true.

4 0
3 years ago
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