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11Alexandr11 [23.1K]
2 years ago
12

Which vector contained the infectious agent, Yersinia pestis?​

Biology
1 answer:
malfutka [58]2 years ago
8 0

Answer:

Yersinia pestis is the causative agent of plague

Explanation:

Rodents, such as rats, carry the disease. It is spread by their fleas.

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15 POINTS!!<br> Water beads on waxed cars due to ______ tension caused by hydrogen bonds.
slega [8]
Cohesive. This means that the water is attracted to other particles of itself, so they stick and bead up.
5 0
3 years ago
How might a single base substitution in the sequence of a gene affect the amino acid sequence of a protein encoded by the gene,
vovangra [49]
The effect differs. It could produce a different amino acid in the sequence because the corresponding codon has changed. It could also prevent the production of the originally intended sequence by changing one of the amino acids of a "start" codon (aka AUG) or extend the protein's sequence by modifying a "stop" codon (UAA, UAG, UGA or UGG), producing a new protein that might be useless or have different effects on the cell.
4 0
3 years ago
Human mutations may increase resistance to some infectious diseases. Humans which carry the mutant gene, the "sickle cell allele
lys-0071 [83]

Answer:

1 - Malaria

2- Typhoid fever and Tuberculosis

Explanation:

In case of malaria, the causal microorganism is Plasmodium falciparum, which target red blood cells of host. In humans who have defective sickle cell allele, have abnomral shaped red blood cells. So microorganism does not able to attach to abnormal shaped RBCs thus humans having sickle cell allele are more resistant to death caused by malaria.

In cystic fibrosis, mutation on that gene which encodes a protein known as cystic fibrosis transmembrane conductance regulator (CFTR).

Normally Salmonella typhi (bacteria responsible for typhoid fever) enters into intestinal cells by attaching with CFTR receptor. Carriers of cystic fibrosis mutant gene, have abnormal CFTR thus reduced rate of entry of bacteria into carriers.

Normally Mycobacterium tuberculosis (bacteria responsible for tuberculosis) adds sulfate in its cell walls. In carriers of cystic fibrosis, arylsulfatase B activity is reduced which incorporates sulfate. Thus reduced arylsulfatase activity makes bacteria unable to add sulfate in its cell walls thus decreases their virulence to carriers of cystic fibrosis.

4 0
3 years ago
Explain why a satellite in polar orbit can take pictures of all parts of the Earth over time
xenn [34]

A satellite in a polar orbit passes over both poles, but the earth rotates beneath it. The time taken for each orbit of the earth depends on the height of the satellite. If the satellite is in a circular orbit 260 kilometers above the surface it will have an orbital period of two hours.



3 0
3 years ago
Can you please answer this fast? Grade: 9 Subject: Science
andrezito [222]

Answer:

69

Explanation:

i lock ur rod in my butt

5 0
3 years ago
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