can someone please help me on this, & of you can please put the letter next to the number?

kristin s asked:

1. Which of the following does NOT describe a polymer?
a)Polymers are made of monomers.
b)Polymers are large molecules.
c)Polymers usually form by covalent bonding.
d)Polymers are broken down by the process of hydrogenation.

2. How many electrons can a carbon atom share?
a)one
b)two
c)three
d)four

3.Which of the following is a chemical reaction?
a)tearing paper into strips
b)burning paper
c)picking up iron filings with a magnet
d)mixing salt and sugar in the same container

4.Carbon-12, carbon-13, and carbon-14 are _____.
a)isotopes
b)polymers
c)radioisotopes
d)macromolecules

5.Unlike carbohydrates and fats, proteins contain _____.
a)nitrogen
b)carbon
c)hydrogen
d)oxygen

6.Diffusion continues until there is no _____.
a)dynamic equilibrium
b)turgor pressure
c)concentration gradient
d)homeostasis

7. Each of the following is a main idea of the cell theory except _____.
a)all organisms are composed of cells
b)the cell is the basic unit of organization of organisms
c)all cells are similar in structure and function
d)all cells come from preexisting cells

8. In a chloroplast, the stacks of membranous sacs are called _____.
a)stroma
b)grana
c)grana
d)thylakoid membrane

9.The fluid mosaic model describes a structure with ____.
a)polar layers on the outside and nonpolar layer on the inside
b)nonpolar layers on the outside and a polar layer on the inside
c)polar layers on both inside and outside
d)nonpolar layers on both inside and outside

12.If cells are placed in a strong sugar solution, water will _____.
a)pass from the sugar solution to the cells
b)pass from the cells to the sugar solution
c)stay in the cell
d)pass back and forth

13.If the sides of a cell double in length, its volume increases by _____ times.
a)two
b)four
c)six
d)eight

14.Among the following, the term that includes the others is _____.
a)interphase
b)nuclear division
c)mitosis
d)cell cycle

15.Unlike plant cells, animal cells contain _____.
a)cell walls
b)centrioles
c)nucleoli
d)spindles

17.Chlorophyll traps _____ from sunlight.
a)oxygen
b)energy
c)hydrogen
d)glucose

18.Energy is released from ATP when the bond is broken between _____.
a)two phosphate groups
b)adenine and ribose
c)ribose and a phosphate group
d)adenine and a phosphate group

19.In respiration, the final electron acceptor in the electron transport chain is _____.
a)oxygen
b)ATP
c)hydrogen ions
d)H2O

20.Kidneys use energy to move molecules and ions in order to keep the blood chemically balanced. This process is an example of cells using energy to _____.
a)carry on chemosynthesis
b)transmit impulses
c)control body temperature
d)maintain homeostasis

21. why is the polar property of water important?

TAILYNN

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