Peptide bonds are formed between

Denaturation affects

Proteins differ from carbohydrates and lipids because they contain

5. Which one of the following best describes the cap modification of eukaryotic mRNA?

3. In eukaryotic transcription, which general transcription factor contains both helicase subunit and promote the formation of the open complex?  

2. An example of a trans acting element in eukaryotic transcription will be:  

The Law of Intermediate Metals for thermocouples states that inserting a third metal at junctions held at the same temperature does not affect the measured voltage. What practical implication does this have?   It means thermocouples only work with two metals, and a third metal will always distort readings. It allows solder, connectors, and measuring instruments to be inserted into the circuit without introducing error, provided their junctions are isothermal. It requires the reference junction to always be at 0°C.  It proves that the voltage produced at the junction of two metals does not depend on temperature.

Which of the following requirements for biopotential amplifiers is most directly addressed by using an instrumentation amplifier with a high common-mode rejection ratio (CMRR)?   Should not influence the physiological process being monitored Should not distort the measured signal Should provide the best possible separation of signal and interferences Should offer protection from electrical shock

A neonatal intensive care unit needs electrodes for continuous ECG monitoring of premature infants over several days. The electrodes must conform to the curved surfaces of tiny limbs and torso, remain comfortable, not require removal for X-rays, but the unit has a limited budget. Compare carbon-filled silicone rubber electrodes versus thin-film Mylar electrodes with Ag/AgCl deposition for this application.   Carbon-filled silicone is better because it has lower impedance than thin-film electrodes  Carbon-filled silicone is better because it provides better conformability to curved infant surfaces  Thin-film electrodes are better because they are X-ray transparent and don’t need removal, despite having higher impedance  Both are equally suitable since they’re both flexible electrode types

An instructor is demonstrating a Wheatstone bridge circuit to a biomedical instrumentation class. The bridge has four arms (with resistors R1 to R4) and is powered by a DC supply. When all four resistors are equal, the voltmeter reads zero. The instructor then replaces R1 with a strain gage bonded to a test beam and presses on the beam, causing the voltmeter to give a reading.  How does replacing one fixed resistor with a strain gage in a Wheatstone bridge allow the circuit to detect small resistance changes?   The bridge amplifies the supply voltage in proportion to the gauge resistance, giving a larger absolute output.  The bridge stores charge until enough resistance change accumulates, then releases it as a pulse proportional to total displacement.  Starting from a perfectly balanced (zero-output) condition, any tiny resistance change in the gage arm immediately creates an imbalance voltage Vab that is directly related to ΔR, allowing small displacements to be detected.  The other three fixed resistors act as reference standards that calibrate the gauge reading automatically on each measurement.