Biology Test CH 5-7

Which of the following do NOT consist of eukaryotic cells?

• plants
• animals
• bacteria
• humans

A cellular organelle that "reads" RNA and assembles amino acids into protenins is the ______.

• lysosome
• mitochondrion
• chloroplast
• ribosome

When cells an the solution surrounding them contain equal amounts of solute, the solution is said to be _______.

• merotonic
• hypertonic
• hypotonic
• isotonic

Which type of transport across a cell membrane requires energy?

• active transport
• osmosis
• diffusion
• facilitated diffusion

Why can't cells directly use energy from glucose?

• Glucose has too little energy.
• Glucose has too mugh energy.
• Cells cannot digest glocose.
• Glucose contains only single bonds.

Why do cells have a continuous supply of ATP?

• Cells store more ATP than they can use
• Phosphate adn water combibe to make more ATP.
• ATP molecules can be used to store energy repeatedly.
• ADP is recycled to make more ATP.

The pupose of nucleic acids like DNA and RNA are to store _______.

• energy
• information
• protein
• glucose

The two sides of the DNA "ladder" are held together by __________.

• the attraction of the opposite charges
• hydrogen bonds
• peptide bonds
• covalent bonds

In a DNA molecule, adenine always bonds to ________.

• thymine
• guanine
• cytosine
• uracil

Proteins are made by

• copying other protein molecules.
• assemblind chains of codons.
• using information stored in DNA.
• all of these.