Lis Midterm Review 2024

Butter and oil are examples of food composed of

• lipids

• fats

• oils

• lipids, fats, and oils

Answer explanation

Butter and oil are examples of fats.

A neutral solution has a pH of

• 3

• 9

• 7

• 0

Answer explanation

A neutral solution has a pH of 7.

Which part of a light microscope does a student look through to see the slide?

• eye piece

• objective

• diaphram

• stage

Answer explanation

The student looks through the eyepiece of the light microscope to see the slide.

Snake venom is modified saliva containing enzymes and other proteins that break down tissue surrounding the bite and destroy blood cells. If bitten, the damage caused by this type of venom would most likely be slowed by what two things

• change temperature

• change in pH

• drinking water

• eating a burger

Answer explanation

Snake venom contains enzymes and proteins that break down tissue and destroy blood cells. The damage caused by this venom can be slowed by administering antivenom.

Which elements are present in all organic compounds?

• oxygen

• nitrogen

• carbon

• hydrogen

Answer explanation

All organic compounds contain carbon and hydrogen atoms.

Which organic molecule is correctly paired with an end product of its digestion (hydrolysis)?

• starches into sugars

• proteins into amino acids

• lipids into glycerol and fatty acids

• nucleic acids into nucleotides

Answer explanation

The correct choice is not provided in the question, hence no end product of digestion can be correctly paired with an organic molecule.

Which cell organelle is composed of a series of channels throughout the cytoplasm that functions in the transport of molecules (like a highway)?

• endoplasmic reticulum

• nucleus

• ribosome

• chloroplast

Answer explanation

The endoplasmic reticulum is composed of a series of channels throughout the cytoplasm and functions in the transport of molecules like a highway.

Fruits and vegetables exposed to air begin to brown because of a chemical reaction in their cells. This may result in these foods being thrown out. Some people have found that adding lemon juice (citric acid) to apple slices keeps them from turning brown. The prevention of browning is likely the result of

• acid slowing the rate of enzyme action

• increasing temperature

• neutral no changes

Answer explanation

Adding lemon juice (citric acid) to apple slices prevents browning by inhibiting the chemical reaction in their cells.

Which statement best describes cellular respiration?

• carbon dioxide makes energy

• glucose and oxygen make energy

• sun makes glucose

Answer explanation

Cellular respiration is the process by which cells convert glucose and oxygen into energy, releasing carbon dioxide and water as byproducts. It is the main way that cells generate ATP, the energy currency of the cell.

Which biological process that happens in the mitochondria?

• hydrolysis

• dehydration synthesis

• photosynthesis

• aerobic respiration

Answer explanation

The diagram represents cellular respiration, a biological process that occurs in the mitochondria.