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Leni [432]
3 years ago
12

Which of the following involves pathogens or an invading viruses or bacteria

Biology
2 answers:
madreJ [45]3 years ago
5 0
The answer is C ! Hoped this helped you out
arlik [135]3 years ago
3 0

Answer: Macrophage

Explanation: Macrophage is the first line of immune defense against invading pathogens like virus and bacteria.Macrophages kill their prey with acids.

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Answer:

Prey

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The aphids are the prey of the ladybug.

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10. What would happen to the food web if all the plants were removed?
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The removal of the producers would cause the collapse of the entire food web. Primary consumers or herbivores, which feed on producers directly, would die off.
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What do you call the reproduction in plants where the male and female parts of the flowers of the plants are involved?
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The data obtained from the meselson–stahl experiment after one generation of replication eliminated the dispersive model of dna
Sedaia [141]
<h2>Given statement is false</h2>

Explanation:

According to dispersive model of DNA replication,DNA molecules are hybrids of parental and daughter DNA;In this model each individual strand is a combination of original and new DNA

Meselson and Stahl did an experiment on DNA replication using E.coli bacteria

  • E.coli was grown in a medium containing heavy isotope of nitrogen,bacteria took up the nitrogen and used to synthesize new biological molecules,including DNA
  • It was grown for many generations,the nitrogenous bases of the bacteria's DNA were all labelled with heavy nitrogen
  • Bacteria were then switched to light nitrogen isotope and allowed to grow for several generations
  • They then measured the density of the DNA using density gradient centrifugation
  • This method separates molecules such as DNA into bands by spinning them at high speeds in the presence of another molecule, such as cesium chloride
  • Each DNA produced two DNA molecules each with one new strand and one old strand called semi conservative replication(half of the parental DNA conserved in daughter DNA)
  • Each DNA strand act as a template for synthesis of new strand
  • Hence,dispersive model of DNA was eliminated and semi-conservative model of DNA replication was proved by the above experiment

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3 years ago
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