Proteins known as cyclins (named because their concentration increases and decreases in a regular pattern through the cell cycle) and enzymes known as cyclin-dependent kinases (Cdks) are the key components in the regulatory events that occur at checkpoints. At the G1 to S checkpoint, two different G1 cyclin/Cdk complexes form, […]

Which component of a muscle does the Ca^++ combine with to allow a contraction to occur? When a muscle is simulated before the muscle can fully relax, it can cause muscle twitch tetarus muscle tendritis When a muscle is stimulated prior to full relaxation of a previous contraction and the […]

In an attempt to mimic the ability of tardigrades to survive space radiation, your research lab is working on protein coverings that could potentially protect vulnerable DNA molecules from space radiation. a) Draw a diagram of a small region of tardigrade DNA helix that is at least partially surrounded by […]

Parkinson disease (PD) is a neurodegenerative disease that has been associated with a significant number of different genes, therefore showing it to be genetically heterogenic. One recent study in 278 families found evidence of two such possible loci. Evidence for linkage to chromosome 18q11 was presented by Gao et al. […]