AP BIO Progress Check MCQ

A certain type of specialized cell contains an unusually large amount of rough endoplasmic reticulum(ER).

Which of the following functions is this cell type most likely specialized to perform?

The production and secretion of proteins

The fluid mosaic model of cell membranes describes proteins and steroids associated with a phospholipid bilayer. Which of the following membrane components affect membrane stability?

Responses

Steroids, such as cholesterol, give membranes more stability.

A scientist is studying the various prokaryotic and eukaryotic species found floating in a sample of water taken from a marine ecosystem.

Which cellular component will be found in the widest range of organisms in the sample

The ribosome, since all organisms need to synthesize proteins.

Which of the following statements accurately describes the facilitated diffusion of materials across a cell membrane?

Ions move down their concentration gradient across the membrane

The antibiotic blasticidin S is a large molecule that can inhibit protein synthesis in mammalian cells. A researcher is investigating how blasticidin S enters mammalian cells. The researcher identified two proteins that might be associated with blasticidin S transport into the cell.

Which of the following claims most likely explains how the two proteins are directly involved in the antibiotic’s ability to enter the cell?

They are transport proteins that facilitate the movement of blasticidin S across the cell membrane.