Answer:
The role of the cholesterol molecules in the phospholipid bilayer can best be described as cholesterol molecules maintain fluidity and integrity of the membrane.
Explanation:
Cholesterol is a component of the cell membranes, the content of which is almost a quarter of the lipid composition of this structure.
The number of cholesterol molecules in the lipid bilayer represents a barrier that prevents substances from passing through it, and one of its most important functions is to <u>collaborate with the organization of the fatty acids that form part of each layer, preventing their tails from fusing</u>, which guarantees the fluidity and integrity of the membrane.
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Major components of cell membranes brainly.com/question/4222663
Answer:the first on is a convergent boundary and the second also looks like a convergent boundary
Explanation:
Answer:
B) Nutrient B only
Explanation:
According to the given information, A, B, and C are required for the normal growth of the organism. The mutant strain has mutated gene A and therefore, can not convert the A into B. However, the given mutation strain is able to convert B into C. If the mutant strain is supplemented with "B", it would be able to form C. In absence of "B" in the medium, the strain would not be able to form both B and C. Therefore, presence of "B" is required in the medium for the given mutant strain.
Complete question:
Categorize the following situation as either a pre- or postzygotic isolating mechanism and then specify which type of pre- or postzygotic isolating mechanism it is.
A short hike through the Sandia Mountains from early spring to late summer will often reveal several different species of penstemon. The Rocky Mountain Penstemon blooms in the spring while the very similar inflated penstemon blooms in late summer. As a result, hybrids are rarely encountered.
Answer:
- pre-zygotic isolating mechanism
- Type: seasonal or temporal
Explanation:
There are different mechanisms of reproductive isolation. These are barriers that inhibit or interrupt the genetic flux between different species. These mechanisms are about the biological characters of each species that prevent the reproduction with other species.
The reproductive isolation mechanisms might be either prezygotic or postzygotic.
-
Pre-copulatory or pre-zygotic:
- Ecological or due to habitat isolation;
- seasonal or temporal;
- Sexual or ethologic;
- Mechanical;
- Gamete incompatibility.
2. Post-copulatory o post-zygotic:
- Hybrid inviability
- Hybrid sterility
- Hybrid with diminished viability and or fertility
- Cytoplasmatic interactions.
The exposed situation is an example of prezygotic isolation due to seasonal or temporal barriers. Penstemon blooms in the spring, while the very similar inflated penstemon blooms in late summer. <em>Probably, if they had the same reproductive season, they would produce hybrids</em>. But as they are isolated by different reproductive seasons, they do not. <em>As they can not even fertilize, they are considered to be prezygotic isolated species. </em>
Answer:
Carbohydrate
Explanation:
Cellulose is a type of carbohydrate