Which of the following is not an idea found in Plato’s The Republic?

What was not a key idea of Plato’s?

What does “tabula rasa” mean?

What does “cogito ergo sum” mean?

Irradiated mammalian cells usually stop dividing and arrest at a G1/S checkpoint. Place the following events in the order in which they occur. accumulation and activation of p53 production of CDI (Cdk inhibitor) inhibition of cyclin–Cdk complexes DNA damage

Indicate whether each of the following statements is likely to be true or false. Integrins are transmembrane components of “adhesion belts”.   [1] Tight junctions seal the plasma membrane of adjacent epithelial cells together, which makes it possible for directional membrane transport across the epithelial sheet to occur. [2] Gap junctions are important structures for coupling the electrical and metabolic activities of adjacent cells. Gap junctions are always open. [3] Extracellular matrix plays an important role in tissue formation and regeneration.  [4]

Complete the following statements by selecting one of the options provided.  A genetic change that inhibits the production of S-cyclin will lead to  [1] It usually takes a few [2] for the initial abnormal cell to develop into a tumor detectable by X-ray. A mutation that increases the activity of the monomeric GTPase Ras will lead to [3] of cells. A mutation that [4] the activity of CDI (Cdk inhibitor) will lead to accumulation of DNA damages. A mutation that [5] the activity of the anaphase promoting complex (APC/C) will cause cell-cycle arrest. The inactivation of cell cycle checkpoints will lead to [6] 

Determine, for each individual case listed below, whether a certain genetic change will result in high activity of the gene product of a proto-oncogene. Answer Yes or No for each case. Gain of a chromosome that contains the proto-oncogene. [1] A mutation that introduces a stop codon 10 amino acids after the codon for the initiator methionine. [2] A mutation within the coding sequence that makes the protein less active. [3] A change in the promoter of the proto-oncogene, causing the normal protein to be transcribed and translated at an abnormally high level. [4]

The actin subunits at the minus end of a rapidly shrinking actin filament most likely contain___

 Indicate whether each of the following statements regarding skeletal muscle contraction is likely to be true or false.   After receiving a stimulating signal from a motor neuron, an action potential is generated and propagated across the plasma membrane of the muscle cell. This causes an influx of Ca2+ into the sarcoplasmic reticulum, triggering a muscle contraction. [1] When the cytoplasmic [Ca2+] increases, a change in the conformation of troponin leads to changes in tropomyosin such that it blocks the binding of myosin heads to the actin filament. [2] During muscle contraction, the Z discs move closer together as the myosin heads walk toward the minus ends of the actin filaments. [3] The T-tubule membrane in the muscle cell contains voltage-gated calcium channels. [4]