Busy. Please wait.

show password
Forgot Password?

Don't have an account?  Sign up 

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.

By signing up, I agree to StudyStack's Terms of Service and Privacy Policy.

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.

Remove ads
Don't know
remaining cards
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
restart all cards

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

Chapter 4 questions


What does it mean that a water molecule is polar? there is positive charge at one end of the molecule and negative charge at the other.
What is pH? What do high and low pHs mean? What pH is neutral? pH is a measurement of the acid or alkaline properties of a molecule--high pHs (above8) are basic and low pHs (below6) are acidic--neutral is pH 7.
What general function do enzymes accomplish? cause the breakdown of nutrients into smaller molecules--combined with other enzymes--complex materials required by the cell--derive energy from chemicals for use by the growing cell.
What are the workers of a cell? enzymes--which are polymers of amino acids
Would an organism that contains 1 million base pairs of DNA be more likely to have 1 thousand or 10 thousand genes? 1,000--an average gene is about one thousand base pairs long.
How many bases of RNA are required to code for one amino acid? 3 RNA bases for 1 amino acid
How do DNA and RNA differ? DNA--double stranded, has the sugar deoxyribose and the nucleotide T(thymidine)--RNA--single stranded--ribose, and U (uridine) in place of T
If a bacterial cell has 35% guanine, how much cytosine would it have? How much adenine? Why is this so? 35% cytosine--C always =s G in DNA--15% adenine because remaining 30% of nucleotides must have = A and T.
What is the main function of lipids in the cell membrane? small macromolecules that span cell membranes--provide nonpolar boundary to keep cellular contents in and unwanted materials out.
Created by: heatherlvn