Biology Exam 1 MGCCC UPDATED ACTUAL Exam Questions and CORRECT Answers

Biology Exam 1 MGCCC UPDATED
ACTUAL Exam Questions and CORRECT
Answers
Atomic Number - CORRECT ANSWER - The Number of Protons in the
Nucleus.


Cation - CORRECT ANSWER - Atom with a positive charge (more protons than electrons)



Anion - CORRECT ANSWER - Atom with a negative charge (more electrons than protons)



he number of Protons CAN or CAN NOT be changed? - CORRECT ANSWER - Can NOT
(except in stars)


electrons - CORRECT ANSWER - are added as dots, starting on the
right, and move clockwise.


isotopes - CORRECT ANSWER - Change in the number of Neutrons



ions - CORRECT ANSWER - Change in the number of Electrons



isotopes (contd.) - CORRECT ANSWER - Neutrons stabilize an atom and keep the protons
and electrons from
pulling each other apart.


When the number of neutrons is changed, the atom destabilizes and
becomes radioactive.

, Uses for Isotopes - CORRECT ANSWER - Medicine (PET scans, FDA approved isotopes,
C14 traces how carbon moves through plants, Radiometic dating..)


half life - CORRECT ANSWER - Time it takes for an atom to lose 50% of its energy



covalent bond - CORRECT ANSWER - electrons are shared



ionic bond - CORRECT ANSWER - electrons are taken



hydrogen bond - CORRECT ANSWER - weak attraction between slightly charged atoms
and a hydrogen atom


covalent bond example - CORRECT ANSWER - oxygen



ionic bond example - CORRECT ANSWER - salt



hydrogen bond example - CORRECT ANSWER - water



H2O - CORRECT ANSWER - H and 0 share electrons, but not evenly. We call this a
Polar Covalent Bond!


hydrogen bond (contd.) - CORRECT ANSWER - weak attraction between a slightly + H, and
a
slightly -atom on some other molecule.


adhesion - CORRECT ANSWER - H2O H-bonds to other H2O



cohesion - CORRECT ANSWER - H2O H-bonds to anything else