Question

Choose the FALSE statement:

A) All cell types in the human body contain exactly the same proportion of each of the cytoplasmic organelles regardless of differences in cell type or their specific function.

B) The purpose of negative feedback is to allow the rate of a metabolic pathway to be regulated at the enzymatic level; regulation is based on specificity and allows cells to use resources more efficiently.

C) Mitosis is a process of cell division that results in the production of two genetically identical cells from a single parent cell.

Choose the FALSE statement:

A) Autotrophic organisms are capable of absorbing the energy found in the sun’s electromagnetic energy spectrum and using it to make chemical bond energy; heterotrophs are incapable of doing this.

B) Heterotrophic organisms rely on the chemical bond energy in the food they eat to supply the needs of their cells.

C) Heterotrophic organisms are often referred to as primary producers in the biosphere.

Choose the FALSE statement:

A) Negative feedback in a metabolic pathway occurs when the final product of a series of reactions has an inhibitory effect on an enzyme found near the beginning of the pathway.

B) According to the secretory pathway, proteins are made on the RER, they then move to the golgi apparatus for processing, and finally to the plasma membrane where exocytosis occurs.

C) Those enzymes required for metabolism within a cell’s cytoplasm, sometimes referred to as housekeeping enzymes, are usually synthesized by ribosomes bound to the rough endoplasmic reticulum.

Answer 1

Q1)

A) All cell types in the human body contain exactly the same proportion of each of the cytoplasmic organelles regardless of differences in cell type or their specific function.

Different cell types have different numbers of organelles, which depends on the function of the cell. For example, neurons and muscle cells have more Mitochondria than any other cell type due to their incresed energy rewuirements.

Q2)

C) Heterotrophic organisms are often referred to as primary producers in the biosphere.

Autotrophs are the primary producers of the biosphere, while heterotrophs are all consumers.

Q3)

C) Those enzymes required for metabolism within a cell’s cytoplasm, sometimes referred to as housekeeping enzymes, are usually synthesized by ribosomes bound to the rough endoplasmic reticulum.

Cytosolic enzymes are synthesized by free-floating ribosomes.