How to convert many PNG to PDF at once on Linux

In Ubuntu distros, install convert and aparallel:

 sudo apt-get install parallel convert  

Once you are on the same directory of the images, run the command above:

 parallel convert '{} {.}.pdf' ::: *.png  

MO640 - Multiple-choice question

Considering C = {abcd, bcdef, afghijk, bcdgh, ghijk}, choose the alternative that contains all twin sets of this collection:

a) abc, gh, ijk.
b) bcd, ef, hij.
c) bcd, gh, ghi.
d) bcd, gh, ijk.
e) None of the above

Original idea by: Victor de Abreu Iizuka

MO640 - Multiple-choice question

Which of PQ-trees below is not equivalent to following PQ-Tree?

A)

B)

C)

D) 

E) NOTA

MO640 - Multiple-choice question

How many block interchanges(Christie 1996) is necessary to sort optimally the following genome?

+1 +5 +3 +2 +7 +4 +8 +6

a) 4
b) 6
c) 5
d) 3
e) None of the above.

MO640 - Multiple-choice question

What is DCJ distance between the two genomes below?

a)4
b)5
c)6
d)7
e) None of the above.

MO640 - Multiple-choice question

Regarding Norm properties, about permutations in Genome Rearrangements, which of the following properties is NOT true:

a - ||α|| = 0 if and only if α = 1
b - ||αβ|| ≤ ||α|| + ||β||
c - ||αβ|| = ||βα||
d - ||α|| = |E| - |orb(α)|
e -  None of above

MO640 - Multiple-choice question

Which of the following evolution events  can be modeled by one or more applications operating double-cut-and-join?

I - Translocation
II - Reversal
III - Blocks Exchange

1. Only I e II.
2. Only I e III.
3. Only II e III.
4. I, II e III.
5. None of the above

Original idea by: João Paulo Pereira Zanetti