Destroyer Bio question #64 and #78

[sminj85]

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Erythrocyte and bacteria both do not have mitochondria. So they cannot go through TCA cycle. In the solution,it says that glycolysis and electron transport chain can occur for both.

I understand glycolysis can occur since it takes place in cytosol. However, doesn't ETC take place in inner membrane of mitochondria? How come ETC occurs even though both lack mitochondria?

Can you explain this?

Oh there is one more question. #158.

In an egg cell, aren't there 23 chromosomes and 46 chromatid? Because 2 chromatid = 1 chromosome?
IS it different in Meiosis and Mitosis?( the answers says egg cell contains 23 chromosomes and 23 chromatids)


TY.

 

[predent0305]

The RBC gets its energy only from glycolysis- it can't do TCA or electron transport chain which happen in the mitochondria. For number 78, it's saying that bacteria also do not have mitochondria therefore can't do the TCA cycle. They can do glycolysis (like the RBC) but unlike the RBC, they have evolved their own mechanism for electron transport which does not use the mitochondria. I found this animation- hope it helps!

http://www.microbelibrary.org/images/Tterry/anim/ETSbact.html

 

[sminj85]

ah.. I c.. Thanks. so RBC does go thru glycolysis only. 🙂

 

[Dentalicous1234]

so the solution is partly wrong if erythrocytes can't do e-transport chain cuz they dont' have mitochondria then right?

 

[predent0305]

it actually has a semicolon before it says that... so i its just giving you additional information that does not pertain to the RBC

 

[kxb4777]

Regarding your 2nd question (#158)...

Meiosis 1: Homologous chromosomes separate and form 2 egg cells
Meiosis 2: Chromatids split at centromere and form 4 haploid egg cells.

Thus, at the end of meiosis, each chromosome strand will consist of 1 chromatid.

Therefore, 23 chromosomes = 23 chromatids.