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Alborosie
3 years ago
13

Which of these is true of prokaryotic cells but not true of all eukaryotic cells?

Biology
2 answers:
Oksanka [162]3 years ago
8 0
Pro cells have cell wall but eukar don’t
ryzh [129]3 years ago
7 0

Answer:

Prokaryotes have a nucleoid region

Explanation:

Prokaryotes have a nucleoid, instead of a nucleus. This is because they don't contain any membrane bound organelles, but eukaryotic cells do contain membrane bound organelles.

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In cell division one difference between animals and plants is that plant cells have a
ExtremeBDS [4]
Plant cells have cell walls while animal cells don't
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3 years ago
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Which scientist developed the idea that microorganisms can cause diseases
Vaselesa [24]

Answer:  Louis Pasteur

Louis Pasteur in 1860s, proposed germ theory. The theory was based upon the fact that diseases are caused by the microorganisms.He was officially the first to publish his work.

6 0
3 years ago
What proportion of emerging diseases is caused by zoonotic pathogens?
gogolik [260]

61% of emerging diseases is caused by zoonotic pathogens

Explanation:

Out of total emerging diseases zoonotic contributes 61%, that are originated from wildlife. The rate is increasing due to growth of human population, its mobility, frivolous, cultural and their socioeconomic purposes. Air is the major source for spread of infectious diseases. Zoonoses are generally caused by bacteria, viruses and pathogens that are blowout between animals and human beings. Modern zoonoses are Ebola virus and salmonella. One of such direct zoonoses is rabies, that is transformed directly from animal to human.

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3 years ago
Imagine that four genes on a single chromosome in a mutant phenotype of Drosophila cross over at half the normal rate as in the
lesantik [10]

We know that frequency of recombination is proportional with the distance between the genes on the chromosome. Therefore when the recombination rate is higher that means the distance between the genes on the chromosome is bigger. If the recombination rate is lower that means the genes are closer to each other on the chromosome. In this case the cross over rate is half the normal rate in the wild-type. That means that on the genetic map the distance between the two genes on the wild type will be twice bigger than the genes of the mutated Drosophila.

6 0
3 years ago
The initiation of transcription requires melting of the DNA double helix, i.e. separating hydrogen-bonded base pairs, immediatel
sertanlavr [38]

Answer:

The correct answer is B. DNA helicase first unwinds the double helix around the +1 site.

Explanation:

The helicase is an enzyme that specifically breaks the hydrogen bonds of the bases in the transcription process. As E. Coli is a prokaryote, then, the transcription only occurs in one point of the circular DNA. The promoter region indicates where the DNA polymerase has to start replicating and the Topoisomerase unwinds the parts of the DNA that are being excessively twisted because of the separation of the two strands.

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3 years ago
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