Biology Midterm Exam

One scientific hypothesis about the origin of life holds that _?_.

• proteins that duplicate themselves came to function in information storage.
• RNA replaced DNA as the most stable information storing molecule.
• as cells evolved, they stopped using RNA entirely.
• RNA existed before DNA.

What do all organisms have in common?

• They use DNA and RNA to pass on information.
• They are all prokaryotes.
• They are all eukaryotes.
• They are all genetically identical.

Tags

NGSS.HS-LS4-1

NGSS.HS-LS4-2

Which of the following is found in eukaryotic cells but NOT prokaryotic cells?

• Cell membrane
• Mitochondria
• Ribosomes
• DNA

Which is not a form of active transport?

• diffusion
• phagocytosis
• pinocytosis
• exocytosis

If a cell is placed in salt water, water leaves the cell by ___.

• diffusion.
• osmosis.
• active transport.
• phagocytosis.

Which statement about enzymes is not true?

• Enzymes are biological catalysts.
• Enzymes are proteins.
• Enzymes work best at a specified pH and temperature.
• All enzymes work inside cells.

A substance that accelerates the rate of a chemical reaction is called a(n) ___.

• catalyst.
• molecule.
• element.
• lipid.

Tags

NGSS.HS-PS1-5

Some peeled potato slices were placed in 100% distilled water and then very salty water. The cells in the potato slices will ___.

• loss water in both solutions.
• gain water in both solutions.
• lose water in the distilled soltuion but gain water in the salty solution.
• gain water in the distilled soltuion but lose water in the salty solution.

Tags

NGSS.HS-LS1-3

An unsaturated lipid contains

• more oxygen than hydrogen.
• only one fatty acid.
• ionic bonds.
• double bonds or triple bonds

Unlike carbohydrates, proteins contain ___.

• hydrogen
• oxygen
• carbon
• nitrogen

Tags

NGSS.HS-LS1-1