Quiz & HW Chp 2 - Biology

Why is water called a Polar Molecule?

b/c the Oxygen & Hydrogen atoms are SLIGHTLY CHARGED

The bonds b/t & among water molecules are called ___ bonds

Hydrogen

Certain insects (water striders) can walk on water b/c water molecules stick to each other, a property called ___

Cohesion

Water is a good ___, it is able to dissolve other molecules

Solvent

The ___ ___ of water is the amount of heat energy that is able to heat 1 gram of water 1 degree Celsius

Specific Heat

A ___ is a building block of macromolecule

Monomer

Lipids are comprised of fatty acids & ___

Glycerol

One function of fats is ___

Energy storage

The basic building block of proteins are ___

Amino acids

___ is an example of a Nucleic Acid

DNA

Water is a ___ molecule w/ slight charged which allows it to be a good solvent

Polar

Which subatomic particles are found in the nucleus of an atom?

1. Protons

2. Neutrons

The __ is the number of protons & tells us the identity of the element. If this number changes than the element changes

Atomic number

The ___ is the weight of protons plus neutrons in an atom of a particular element.

1. Mass number

2. Atomic mass

What is a common use of an isotope?

1. They are used in images of the body tissues

2. Healing cancers

Which type of bond holds different water molecules together?

Hydrogen bonds

Which characteristic of water allows water to stick to another water molecule

Cohesion

Which subatomic particle is important in forming a chemical bond?

Electrons

The octet rule states that atoms attempt to have ___ electrons in their outer shells, after the 1st shell, to be stable

8

An element in Group 3 on the Periodic Table is more likely to ___ their outer electrons to become more stable

Give up

A ___ bond is formed from the attraction b/t 2 differently charged atoms, like Na+ & Cl-

Ionic

A ___ is a solution w/ more H+ ions & a ___ is a solution w/ more OH- ions

Acid, base

A ___ bond is a bond b/t atoms in which an electron or electrons are shared b/t or among two or more elements

Covalent

The elements in Group 5 of the Periodic Table of the Elements are related b/c they all have ___ electrons in their outer shells

5

A ___ is formed by combining many monomers

1. Polysaccharide

2. Polymer

Which of the following is an energy storage biomolecule

Glycogen

What is the monomer of a protein?

Amino acid

What are the basic components (monomer) of a nucleotide (DNA, RNA)?

Pentose sugar, a phosphate group, & a nitrogenous base

Which lipid is used for building hormones & chemical communication in the body?

Cholesterol

What carbohydrate is responsible for structure in plants?

Cellulose