Which of the following plastids is a precursor to all other plastids?

How would mutational inactivation of the nuclear export signal of a protein that normally shuttles back and forth between the nucleus and the cytoplasm affect its subcellular distribution?

Transport of glucose into the intestinal epithelium is driven by ion gradients established by the?

_______ would be expected to block Notch signaling.

Why do actively growing cells have larger nucleoli than resting cells?

The ribosomes of the rough endoplasmic reticulum are targeted to the cytoplasmic side of the membrane via?

How would treatment of cells with a drug that makes membranes permeable to protons affect the function of the lysosomes?

The basis for skeletal muscle contraction is the?

What distinguishes the functions of smooth endoplasmic reticulum (SER) from peroxisomes?   A) SER is primarily involved in lipid metabolism, while peroxisomes are responsible for protein synthesis. B) SER plays a role in detoxification processes, while peroxisomes are involved in the breakdown of fatty acids and hydrogen peroxide. C) SER stores calcium ions for muscle contraction, while peroxisomes regulate pH balance within the cell and breakdown of fatty acids. D) SER synthesizes carbohydrates for energy production, while peroxisomes store genetic material for cell replication

mRNAs are degraded in the cytoplasm by?