How can K+ channels selectively transport K+ but not Na+ ions, since Na+ ions are smaller?

Whether a microtubule shrinks or grows is determined by the?

The sequence of DNA on each chromosome where the sister chromatids are held together is called the?

The inner face of the nuclear envelope of animals is mechanically supported by?

In a freshwater pond, a biologist collects water samples to study microorganisms. Upon microscopic examination, they observe a single-celled organism exhibiting the following characteristics: It has a distinct elongated shape with a tapering tail-like structure. There is a prominent reddish eyespot near the anterior end. Long flagella are visible, extending from the anterior end. Based on these observations, which of the following conclusions can the biologist draw about the organism?    

A feature common to most transmembrane proteins is a(n)?

How would introduction of an siRNA targeting COPII affect protein trafficking through the secretory pathway?

The progression from metaphase to anaphase is triggered by

Most scaRNAs function as?

Clathrin-coated vesicles are involved in?