Save
Busy. Please wait.
Log in with Clever
or
show password
Forgot Password?
Don't have an account?  Sign up 
Sign up using Clever
or
Username is available taken
show password

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.

Question

T or F
Carbon, hydrogen, oxygen, and nitrogen make up more than 90% of
living matter.
click to flip
focusNode
Didn't know it?
click below
 
Knew it?
click below
Don't know

Question

T or F
The trace element iodine is required only in very small quantities by vertebrates.
Remaining cards (25)
Know
0:00
edit
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

BIO 100--Quiz 3

QuestionAnswer
T or F Carbon, hydrogen, oxygen, and nitrogen make up more than 90% of living matter. True
T or F The trace element iodine is required only in very small quantities by vertebrates. True
T or F Virtually all organisms require the same elements in the same quantities. False
T or F Iron is an example of an element needed by all organisms. True
T or F Phosphorus is required in sufficient, but not huge, quantities True
Each element is unique and different from other elements because of the number of protons in the nuclei of its atoms. Which of the following indicates the number of protons in an atom's nucleus? atomic number
The atomic number of carbon is 6. Carbon-14 is heavier than carbon-12 because the atomic nucleus of carbon-14 contains _____ neutrons. 8
A covalent chemical bond is one in which... outer-shell electrons of two atoms are shared so as to satisfactorily fill the outer electron shells of both atoms.
Nitrogen (N) is much more electronegative than hydrogen (H). Which of the following statements is correct about the atoms in ammonia (NH3)? Each hydrogen atom has a partial positive charge. Correct
Nitrogen (N) is much more electronegative than hydrogen (H). Which of the following statements is correct about the atoms in ammonia (NH3)? The nitrogen atom has a strong positive charge. False
Nitrogen (N) is much more electronegative than hydrogen (H). Which of the following statements is correct about the atoms in ammonia (NH3)? Each hydrogen atom has a slight negative charge. False
Nitrogen (N) is much more electronegative than hydrogen (H). Which of the following statements is correct about the atoms in ammonia (NH3)? The nitrogen atom has a partial positive charge. False
Nitrogen (N) is much more electronegative than hydrogen (H). Which of the following statements is correct about the atoms in ammonia (NH3)? There are covalent bonds between the hydrogen atoms False
What results from an unequal sharing of electrons between atoms? a polar covalent bond
Which of the following results from a transfer of electron(s) between atoms? nonpolar covalent bond polar covalent bond ionic bond hydrogen bond hydrophobic interaction ionic bond
Which of the following describes the attractive force between different water molecules to each other MOST specifically? nonpolar covalent bond polar covalent bond ionic bond hydrogen bond hydrophobic interaction hydrogen bond
Van der Waals interactions result when... electrons are not symmetrically distributed in a molecule.
Which of the following effects is produced by the high surface tension of water? A water strider can walk across the surface of a small pond.
Water's high specific heat is mainly a consequence of the... absorption and release of heat when hydrogen bonds break and form.
Why does ice float in liquid water? Hydrogen bonds stabilize and keep the molecules of ice farther apart than the water molecules of liquid water
Which of the following is NOT a polymer? glucose starch cellulose chitin DNA glucose
What is the chemical mechanism by which cells make polymers from monomers? dehydration reactions
The bonding of two amino acid molecules to form a larger molecule requires... the release of a water molecule.
There are 20 different amino acids. What makes one amino acid different from another? different side chains (R groups) attached to a central carbon
Thalidomide and L-dopa, shown below, are examples of pharmaceutical drugs that occur as enantiomers, or molecules that... are mirror images of one another.
Which two functional groups are always found in amino acids? carboxyl and amino
 

 



Voices

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:
Retries:
restart all cards