Part 1 of bio test

The four most common elements in living organism are

• A) C, H, O, N

• B) C, N, O, N+

• C) C, H, O, Fe

• D) C, H, O, Na

Which of the following statements best describes a compound?

• A compound is a solution.

• A compound is a pure element.

• A compound contains two or more different elements in a fixed ratio.

• A compound is exemplified by sodium

Tags

NGSS.MS-PS1-1

Typically, nitrogen atoms are composed of electrons, protons, and neutrons. An isotope of nitrogen could

• be positively charged

• have more neutrons than the usual nitrogen atom

• be negatively charged

• have more protons than the usual nitrogen atom

Tags

NGSS.MS-PS1-1

What is the fundamental difference between covalent and ionic bonding?

• Covalent bonding involves only the outermost electrons shell, ionic bonding also involves the next electron shell inside the outermost shell.

• Covalent bonding form between atoms of the same element, ionic bonding form between atoms of different elements

• In a covalent bond, both partners end up with filled outer electron shells. ionic bond, on partner does and the other does not.

• In a covalent bond, the partners share a pair of electrons; in an ionic bond, one partner accepts electrons from the other.

In a water molecule, hydrogen and oxygen are held together by a(n)____bond.

• Polar covalent

• double covalent

• Hydrogen

• nonpolar covalent

Water molecules stick to other water molecules because

• Water molecules are neutral, and neutral molecules are attracted to each other.

• Covalent bonds form between the hydrogen atoms of one water molecules and the oxygen atoms of other water molecules.

• Hydrogen bonds form between the hydrogen atoms of one water molecules and the oxygen atoms of other water molecules.

• the oxygen atoms of adjacent water molecules are attracted to one another.

Which of the following statements about pH is true?

• A single unit change on the pH scale in equivalent to a 1% change in hydrogen ion concentration

• An increase in hydrogen ion concentration means a decrease of pH scale units

• Basic pH level are lower than 7

• The pH scale is a measure of oxygen ion concetration

To produce one glucose, the Calvin Cycle needs to be run through___time(s).

• two

• four

• eight

• six

Tags

NGSS.MS-LS1-6

NGSS.MS-LS1-7

Phosphorylation during photosynthesis differs from oxidative phosphorylation during cellular respiration in that

• it involves an electron transport chain

• the final electron acceptor is NADP+ and not oxygen

• regeneration of ATP is driven by a flow of protons through an ATP synthase.

• energy is stored in the form of a proton concentration difference.

Tags

NGSS.MS-LS1-6

Photosystem II

• does not have a reaction

• passes electrons to photosystem I.

• releases CO2 as a by-product

• has 1700 as its reaction center

Tags

NGSS.MS-LS1-6