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Otrada [13]
2 years ago
15

Helper t cells are activated by ________ on ___________ cells

Biology
1 answer:
inessss [21]2 years ago
5 0
Helper T cells become activated by interacting with antigen presenting cells. and the second blank space is either cytotoxic t cells or B cells
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Why is it important that scientists haven’t identified a Lokiarchaeota cell yet?
WARRIOR [948]
It's important because we need the scientists to discover where it is. The Lokiarchaeota is a main cause for infections, and diseases, and if we identify it, and study it, we may know how to cure certain diseases, and how to prevent them. 
4 0
2 years ago
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Cyclopropane is a highly strained molecule. why? select all that apply.
aleksley [76]

Cyclopropane is a highly strained molecule because the conformations of the cycloalkanes are influenced by the torsional, angle strain, and steric strain. Cycloalkanes, which comprises more than three atoms of carbons are not flat molecules, they are puckered.  

The three and four-membered ring components exhibit angle strain and minimize the internal bond angles. The angle strain is generated when the bond angles deviate from the optimum tetrahedral angle, that is, 109.5 degree.  

Torsional strain is a resultant of eclipsing interactions, and steric strain is attained when the atoms are forced too close to each other.  


3 0
2 years ago
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Suppose the sub-hypothesis that wing waving alone reduces predation by jumping spiders was supported by the Zonosemata experimen
Sliva [168]

Answer:

The correct answer is: <em>Zonosemata flies with housefly wings are attacked less frequently</em>

Explanation:

The Zonosemata experiment is a scientific experiment that was conducted to investigate how zonosemata flies are able to protect themselves from predation by jumping spiders. In this study, housefly wings were transplanted onto zonosemata flies. This made zonosemata flies protected from attack by jumping spiders. On the other hand, when zonosemata wings were transplanted onto houseflies, they were easy targets for jumping spiders. Therefore, if the sub-hypothesis that wing waving alone reduces predation by jumping spiders is proven, the logical result would be that:  Zonosemata flies with housefly wings are attacked less frequently.

4 0
2 years ago
In a Biology 101 lab, Alex and Samuel were given unknown cells. Through a variety of staining and microscopy techniques, they de
Inessa05 [86]

Answer:

They concluded that the cell is eukaryotic cell.

Explanation:

Prokaryotic and eukaryotic cells are the two types of organisms. Prokaryotic organisms are the organisms made up of prokaryotic cells and eukaryotic organisms are made up of eukaryotic cells.  

Prokaryotic cells do not have a nucleus and other membrane-bound organelle and eukaryotic cells have a nucleus and other membrane-bound organelles like mitochondria.  

Therefore if the cell has mitochondria they must conclude that the cell is eukaryotic because the prokaryotic cell does not have mitochondria as it is a membrane-bound organelle.

6 0
2 years ago
what is sequence of steps in photosynthesis how is it different in desert plants and those in temperate regions​
Rina8888 [55]

Answer:

The steps of photosynthesis are mostly the same for both the plants of desert and temperate regions. The only difference is that desert plants take up carbon dioxide at night and store it as an organic acid inside the body.

Explanation:

4 0
2 years ago
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