Final Exam Biology 2022

Which subatomic part of an atom gives it a positive charge?

• Neutron

• Proton

• Electron

• Nucleus

Which region of an atom has a negative charge?

• The nucleus

• Both nucleus and electron cloud

• The neutrons

• The electron cloud

What is the smallest 'building block' of the elements that make up the universe?

• An atom

• An electron

• A proton

• A cell

An atom of carbon has 6 protons and 7 neutrons in its nucleus. If the atom is neutral, how many electrons does it have?

• 0

• 7

• 6

• 13

The number of protons in the nucleus of an atom?

• Isotope

• Atomic mass

• Atomic number

• Element

An atom of iodine has 7 valence electrons. What will an atom of iodine MOST likely do to be stable?

• Lose 1 electron

• Lost 7 electrons

• Gain 1 electron

• Neither gain nor lose any valence electrons

What type of bond is formed when atoms share electrons?

• Covalent

• Ionic

• Hydrogen

• Polyatomic

How are ionic and covalent bonds alike?

• They both form organic molecules.

• They both fill outer electron shells.

• They both transfer electrons from one atom to another.

• They both transfer protons from one atom to another.

Nucleic acids are one of the four major macromolecules.  The main functions of nucleic acids are to

• store and transport energy and structural components in the cell.
• act as enzymes, cell signals, and structural support for the cell.
• carry genetic material and create structures inside the cell.
• aid in development, the immune system, and blood clotting.

Protein molecules are composed of long chains of __________ .

• ribosomes
• RNA
• amino acids
• DNA