Biology

1. What best describes the chemical attraction illustrated above?

• A polar covalent bond.

• A nonpolar covalent bond.

• A hydrogen bond.

• An ionic bond.

Tags

NGSS.HS-PS1-3

What would the net electrical charge of an atom with 4 protons, 5 neutrons, and 5 electrons be?

• 0

• -1

• +1

• +4

The part of the molecule labeled A could best be described as

• phosphate group

• a fatty acid

• an alpha carbon

• a glycerol

What form would a collection of these molecules likely take at room temperature?

• a solid

• a liquid

• a gas

• More information is needed.

Tags

NGSS.HS-PS1-5

The macromolecule above is best described as

• a phospholipid.

• a triglyceride.

• a carbohydrate.

• a protein.

The part of the molecule labeled B could best be described as

• saturated.

• unsaturated.

• neither saturated or unsaturated.

• None of the above

At a pH of 6, the concentration of protons in solution is

• 10 times lower than it is at a pH of 7.

• 10 times higher than it is at a pH of 7.

• 100 times lower than it is at a pH of 7.

• 100 times higher than it is at a pH of 7.

Consider the following electronegativity values:

Boron (B) = 1.8

Carbon (C) = 2.5

Chlorine (CL) = 3.2

Selenium (Se) = 2.6

Which of the following covalent bonds is the most polar?

• C-Se₂

• C-CL

• B-CL

• Se-CL

Tags

NGSS.HS-PS1-1

Which of the following characterize a single water molecule?

• It is nonpolar.

• The electronegativity of the oxygen atom is significantly lower that the electronegativity of the hydrogen atoms.

• It contains two hydrogen bonds.

• Its oxygen atom has a partial negative charge.

What statement below best describes nonpolar molecules?

• Nonpolar molecules are hydrophilic and can mix with water molecules.

• Nonpolar molecules are hydrophilic and do not mix with water molecules.

• Nonpolar molecules are hydrophobic and can mix with water molecules.

• Nonpolar molecules are hydrophobic and do not mix with water molecules.