Partial hydrolysis of lecithin by lecithinases (enzyme in black widow spiders and snakes venom) causes the removal of only one fatty acid to yield lysolecithins, which when subjected to the bloodstream by sting as a result of spider bite causes the rupture of red blood cells.

Thus, the mechanism is that it is toxic to red blood cells.

8 0

2 years ago

In pea plants, purple flowers are dominant to white flowers. Suppose two heterozygous purple-flowered plants (Tt) are crossed. W

iris [78.8K]

Answer:

75%

Explanation:

This question involves a single gene coding for flower color in pea plants. The allele for purple flowers (T) is dominant over the allele for white flowers (t).

According to the question, two heterozygous purple-flowered plants (Tt) are crossed i.e. Tt × Tt. The following gametes will be produced by each parent; T and t. Using these gametes in a punnet square (see attached image), the following proportion of offsprings will be produced:

TT, Tt, Tt, and tt.

Since purple allele (T) is dominant, offsprings TT, Tt, and Tt will be phenotypically purple-flowered. Hence, ¾ × 100 = 75% of offsprings will have purple flowers.

4 0

2 years ago

2 Points<br> What is the purpose of the vascular system in a plant?

andrey2020 [161]

Answer:

To distribute nutrients and water

Explanation:

An set structure of tissues and fibres, basically a meaning of the vascular system for a plant. The xylem tissue distributes water and nutrients to other parts of the plant such as the leaves.

6 0

2 years ago

Read 2 more answers

From what element do the sulfates get their names?

Debora [2.8K]

If this is what you are looking for : SO4 is sulfate's formula. We can say Sulphur and Oxygen is the answer.

7 0

2 years ago