11 - Cells, the simplest Functional Units

Question 1

What would you sequence from single cells to define different cell types?

A- Nuclear DNA
B- tRNA
C-mRNA
D- mitochondrial DNA

Answer 1

mRNA
Genomic DNA is the same in all cells of an organism. What defines different cell types is different gene expression (i.e. mRNA)

MIT - Introduction to Biology
11. Cells, the Simplest Functional Units
https://www.youtube.com/watch?v=SA8dRTq3qUA&list=PLUl4u3cNGP63LmSVIVzy584-ZbjbJ-Y63&index=11

Question 2

This is the concentration of Na+, K+, and Ca2+ in exoplasm and cytoplasm respectively. How is this selectivity possible?

Answer 2

By using energy, cells maintain different concentration of ions inside and out.

MIT - Introduction to Biology
11. Cells, the Simplest Functional Units
https://www.youtube.com/watch?v=SA8dRTq3qUA&list=PLUl4u3cNGP63LmSVIVzy584-ZbjbJ-Y63&index=11

Question 3

What is endosymbiont theory?
What are the evidence to support it?

Answer 3

M