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Vsevolod [243]
3 years ago
7

Which statement best explains how lysosomes contribute to the cycling of nutrients through a cell?

Biology
1 answer:
Volgvan3 years ago
5 0

Answer:

C. They break down food materials into forms the cell can use.

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What phenomenon occurs in females as a result of x-chromosomes inactivation
Arada [10]

This happens early in embryonic development in females, where one of the two X-Chromosomes is randomly (and permanently) inactivated, as you said, in cells other than egg cells.

This phenomonon is actually called X-Inactivation.

X-Inactivation make sure that females, just like males, have a single functional copy of the X Chromosome in each and every one of their cells in their body.

Glad I could help, byee now

3 0
3 years ago
A cat weighs 8.5 pounds on earth. how much would this cat weigh on neptune?
Korvikt [17]
Neptune's gravitational factor relative to earth is 1.19.

That means we have to multiply 8.5 by 1.19.

8.5 * 1.19
10.115

Answer: 10.115 pounds
5 0
3 years ago
Can evolution be proven false?
Afina-wow [57]
I mean there is a lot of evidence that evolution has happen but i think if someone were to say it was false they would be getting into a religious beliefs. So I would say if you are using evidence than no it cannot be proven false. Hope this helps(;
6 0
3 years ago
Define the 3 signals for activation and the 3 outcomes of the complement system.\
sp2606 [1]
* More than 40 proteins and glycoproteins involved in the complement system are synthesized by the liver, macrophages, epithelial cells, they are present in the blood in plasmatic form, membrane, some have an enzymatic activity, regulator or membrane receptorThese are elements of the humoral innate immune response, they fight infections, purify immune complexes and apoptotic bodies.
<span>There are indeed three ways to activate the complement:</span>
Classical pathway: Activated by Immunoglobulins in immune complexes, aggregated Immunoglobulins, DNA, CRP, apoptotic bodies .......it involves nine fractions, starting with C1, then C4, C2, C3, to form a classical C5 convertase, then, activation of C5, C6, C7, C8, C9.

Alternative pathway: activated by polysaccharides (bacterial endotoxin), vascular wall poor in sialic acid, aggregated IgE ...C3b like is the first component in the alternate channel cascade, it will create an amplification loop, and form an alternative C5 convertase.

Lecithin pathway: Activated by mannose, fucose (carbohydrate of microorganisms)The first component is the complex MBL / MASP1 / MASP2: "mannose-binding protein": works according to the same principle as the complex C1 of the classical way (MASP2 cleaves the C4 and the rest of the cascade is equivalent to that of the classical way).

the three ways have the same outcome: A C5 convertase (formed by one of the pathways) cleaves C5 into C5a and C5b: C5b is deposited far from other fractions on the antigenic surface. The fixation of C5b in the cell is followed by that of C6, C7, C8, and C9 (9 molecules of C9): formation of the membrane attack complex (MAC) ==> Death of the cell by osmotic shock
8 0
3 years ago
What percentage of all water is fresh on earth?
schepotkina [342]

3% of earth's water is actually fresh, not salty ocean water

8 0
3 years ago
Read 2 more answers
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