[Mjolnir:~]mkdir test
[Mjolnir:~]chmod 644 test
[Mjolnir:~]ls -l | grep test
drw-r--r--  2 USER USER       4096 Jun  1 15:03 test/
[Mjolnir:~]ls -l test
ls: cannot access 'test/.': Permission denied
ls: cannot access 'test/..': Permission denied
total 0
d????????? ? ? ? ?            ? ./
d????????? ? ? ? ?            ? ../
[Mjolnir:~]cd test
-bash: cd: test: Permission denied
[Mjolnir:~]chmod 755 test
[Mjolnir:~]ls -l | grep test
drwxr-xr-x  2 USER USER       4096 Jun  1 15:03 test/
[Mjolnir:~]ls -l test
total 8
drwxr-xr-x  2 USER USER 4096 Jun  1 15:03 ./
drwxr-xr-x 57 USER USER 4096 Jun  1 15:04 ../
[Mjolnir:~]cd test
[Mjolnir:test]