You discover alien life with a genetic system based on a DNA-like molecule, but it has 6 bases instead of 4 as happens on Earth. The proteins on the planet are built from combinations of 30 possible amino acids. What would be the minimum number of bases in each codon on this planet?

A tRNA has an anticodon with the sequence 3′-UAC-5′. What would be the sequence of the complementary codon?  

RNA splicing occurs after transcription but before translation.  This statement is:

The optimal interatomic distance for strong Van der Waals interactions between atoms of two molecules is about:

Using the arrow designations, identify the C-terminus in the structure below.

The gene dystrophin is found in both skeletal muscle and in the kidney.  In muscle, the dystrophin protein is 2400 amino acids longer than the dystrophin protein found in the kidney.  Which cellular process best explains this observation? 

A buffer has all of the following characteristics EXCEPT:

In a right-handed double helix, if one looks down the central axis of the molecule, _________.

The image shown below displays amino acid side chains (shown in sticks) represented as numbers. Choose the statement(s) below that is/are correct. Serine is represented by label 3. Tryptophan is represented by label 2. Alanine is represented by label 4. Cysteine is represented by label 7. Disulfide bonds formed by two cysteine residues are represented by label 5.

If a polypeptide is 100 amino acids long, and could be made of any of the 20 amino acids in any order, what is the total number of possible variations for this polypeptide?