Busy. Please wait.
Log in with Clever

show password
Forgot Password?

Don't have an account?  Sign up 
Sign up using Clever

Username is available taken
show password

Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
Your email address is only used to allow you to reset your password. See our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
Didn't know it?
click below
Knew it?
click below
Don't Know
Remaining cards (0)
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

L31 - Genetic Code

USCSOM: Biochemistry: L31 - Genetic Code

What is a codon? A set of three nucleotides
How many different possible trinucleotides can be formed? 64
Which way, wrt 3' and 5' ends, do codons read? 5' to 3'
What is the second letter for all AAs with a charged side chain? A
Which 2 letters are the most important in a codon? ONLY first 2
Which AAs have the most codons? Arg, Leu, Ser
Which AAs have single codons? Trp and Met
Which codons are stop codons? UGA, UAG, UAA
What is the initiator codon? AUG
Codons with what letter will have a hydrophobic side chain? U
What are anticodons? the codon match on the tRNA during protein synthesis
What is the wobble hypothesis? the first base of the anticodon does not follow stringent pairing with the last base of the codon
What is meant by 5'-UTR? the 5'-untranslated region; usually 30 - 100 nucleotides in before the initiation of translation
What is meant by 3'-UTR? 3'-untranslated region; the region downstream from the stop codon on the mRNA
What is the term reading frame? the nucleotide sequence being translated
How many possible reading frames are there in a given region of DNA? 6
What is ORF? open reading frame; series of codons that lacks a stop codon
What is the frequency of having a stop codon in a random sequence of codons? 1/20
What is a point mutation? What are the two kinds? a single base pair change; transition A to G; transversion purine to pyrimidine
What is a silent mutation? 3rd place change in a codon; typically has no effect on phenotype
Describe a Missense mutation point mutation, changes the meaning of a codon word and thus changes a single AA
Describe a nonsense mutation stop codon in a coding region; generally serious mutations
Insertion mutations lead to frame shift mutations downstream; serious mutations
Created by: jlellerm
Popular Biochemistry sets




Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!
"Know" box contains:
Time elapsed:
restart all cards