Midterm Bio 3

Buffers

• 1. release large amounts of hydrogen ions (H+).

• 1. are strong acids or bases.

• 1. keep the pH within normal limits.

• 1. lower the pH.

Select all that apply. Which organelles/structures make up the endomembrane system?

• Lysosomes

• Cell wall

• Mitochondria

• Golgi apparatus

• Endoplasmic reticulum

Water molecules have one oxygen atom that is more electronegative than the two hydrogen atoms bound to it. As a result, which type of bonding holds water molecules together?

• non-polar covalent bonding

• polar covalent bonding

• ionic bonding

Which of the following organelles work to break down cellular debris "garbage" via enzymes?

• lysosomes

• vesicles

• mitochondria

• endoplasmic reticulum

Which of the following biomolecules acts as an insulator?

• lipids

• proteins

• nucleic acids

• carbohydrates

After sodium loses an electron, it is a(n)_____________.

• positive ion

• negative ion

• neutral ion

• isotope

After chlorine gains an electron, it is a(n)_____________.

• positive ion

• negative ion

• neutral ion

• isotope

Which type of microscope can be used to view cellular organelles such as the endoplasmic reticulum and Golgi? 

• Scanning electron microscope

• Transmission electron microscope

• Light microscope

Which organelle of the endomembrane system puts final touches on molecules?

• smooth er

• rough er

• lysosomes

• vesicles

• the Golgi apparatus