Answer:
The correct answer will be- by lowering the surface tension at air/liquid transition.
Explanation:
Pulmonary surfactant is the mixture of proteins and lipids produced by the type II epithelial cells.
The surfactant is selected into the alveolar sacs where the surfactant reduces the surface tension of the air/liquid interface to 1 mN/m. The lipid content of the surfactant called dipalmitoylphosphatidylcholine or DPPC forms a surface film which lowers the surface tension.
This power surface tension reduces the work of breathing and thus prevent the alveolar sac from rupture or collapse.
Thus, by lowering the surface tension at air/liquid transition is the correct answer.
A pathway that tends to slow down a process is called a negative feedback loop.
<h3>What we know about these loops. </h3>
- These loops function to reduce the rate a which a process occurs.
- Being a feedback loop means that they take in stimuli from the environment of the cell in order to affect the rate of production of a compound.
- A negative feedback loop will activate when the concentration of the compound being produced is too high.
- In response, the negative loop will reduce the rate of production temporarily.
Therefore, we can confirm that a pathway that tends to slow down a process is called a negative feedback loop.
To learn more about feedback loops visit:
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Answer:
a. M_D_
: 9/16 Black furred individuals
b. M__dd
: 3/16 gray furred individuals (1/16 MMdd + 2/16 Mmdd)
c. mmD_
: 3/16 Brow-furred individuals (1/16 mmDD + 2/16 mmDd)
d. mmdd: 1/16 gray furred individuals.
Explanation:
Available data:
- Dense pigment gene, D, codes for melanophilin.
- D allele dominant over d.
- Gene M/m is responsible for the production of the pigment
- M is dominant over m
- If D is present, M/m is expressed
- If dd is present, M/m is not expressed
- DDMM, DdMM, DDMm, DdMm --->Black fur
- DDmm, Ddmm ---> Brown fur
- ddMM, ddMm -----> Light gray fur
Cross: between two dihybrids
Parental) DdMm x DdMm
Phenotype) Black-furred Black-furred
Gametes) DM, Dm, dM, dm DM, Dm, dM, dm
Punnet Square) DM Dm dM dm
DM DDMM DDMm DdMM DdMm
Dm DDMm DDmm DdMm Ddmm
dM DdMM DdMm ddMM ddMm
dm DdMm Ddmm ddMm ddmm
F1) 9/16 Black-furred individuals, D-M- (1/16 DDMM + 2/16 DDMm + 2/16
DdMM + 4/16 DdMm)
3/16 Brown-furred individuals, D-mm ( 1/16 DDmm + 2/16 Ddmm)
4/16 Gray-furred individuals, dd-- ( 1/16ddMM + 1/16 ddmm + 2/16 ddMm)
Maybe A, B, and D, this could be wrong but my best guesstimate
