cell wall , cell membrane , specialized cells , lipids , carbohy

Which of the following is a primary function of the cell membrane?

• To prevent the entry and exit of substances into and out of the nucleus

• To synthesize, store, and transport proteins

• To separate the components of the cell from the surrounding medium or environment

• To provide support and structure to the cell

Cellulose is formed by many repeats of which carbohydrate?

• Alpha glucose

• Beta glucose

• Lactose

• Sucrose

Which of the following is a primary function of lipids in animals?

• Lipids are the site of protein synthesis within the cell.

• Lipids provide insulation for cells and organs.

• Lipids store genetic material and undergo mitosis to produce new cells.

• Lipids are a major component of the animal cell wall.

Which of the following statements about the structure of biological membranes is correct?

• Cell membranes are formed from a single layer of phospholipids and a single layer of glycolipids, connected by hydrophobic tails.

• Cell membranes are formed from a single layer of phospholipids, connected by their hydrophobic heads.

• Cell membranes are formed from two layers of phospholipids, where the hydrophilic phospholipid tails link together in a matrix.

• Cell membranes are formed from two layers of phospholipids, where the hydrophilic phospholipid heads face outward.

Cells are the fundamental units of life. Which statement about cells is true?

• They cannot carry out multiple functions as they are the smallest building units in the body.

• Even though they are the smallest building units in the body, they can carry out several functions.

• They are the smallest building units in eukaryotes only.

• They are the smallest building units in prokaryotes only.

The oxidation of carbohydrates and lipids provides almost all the energy the human body needs. What is the difference between the energies provided by both of them?

• The energy obtained from lipids is more important than the energy obtained from the same amount of carbohydrates.

• The energy from lipids can be easily obtained, whereas the energy from carbohydrates takes more time and requires some complicated reactions to be obtained.

• The energy obtained from lipids is more than the energy obtained from the same amount of carbohydrates.

• The energy obtained from lipids is less than the energy obtained from the same amount of carbohydrates.

Which molecule found within a phospholipid bilayer of animal cells provides structural support to the membrane?

• Cellulose

• Actin

• Myosin

• Starch

• Cholesterol

Which of the following is true about cell walls and cell membranes?

• Cell membranes are found in eukaryotes, while cell walls are only found in prokaryotes.

• Cell membranes are found in fungi and bacteria, while cell walls are found in bacteria only.

• Cell membranes are found in animal and plant cells, while cell walls are not found in animal cells.

• Both cell membranes and cell walls are found in animal and plant cells.

Which of the following best describes the main structural difference between triglycerides and phospholipids?

• Triglycerides contain fatty-acid molecules; but in phospholipids, these fatty acids are replaced by phosphate molecules.

• Triglycerides contain three fatty-acid molecules; but in phospholipids, one of these fatty acids is replaced by a phosphate molecule.

• Triglycerides contain three glycerol molecules; but in phospholipids, one of these glycerols is replaced by a phosphate molecule.

• Triglycerides contain hydrogen, carbon, and oxygen only; but in phospholipids, the hydrogens are replaced by phosphates.

Glucose can be stored as the polysaccharide starch in plant cells. What polysaccharide acts as the primary unit of glucose storage in animal cells?

• Chitin

• Alpha-glucose

• Glucagon

• Cellulose

• Glycogen