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Which statement is true about macromolecules?

Aim: To investigate the influence of exercise on the heart rate of a person.    Apparatus:   Two volunteers (Person A and Person B; you may also be Person A)  Stopwatch (cell phone may also be used)   Pen and paper    Method:   Ensure that both persons are at rest having done no physical activity for at least 10 minutes.  Both persons’ heart rates are measured at rest and recorded in a table.  Person A runs on the same spot for exactly 30 seconds, lifting their knees up high    When Person A finished running for 30 seconds, Person B takes Person A’s pulse and records it in a table.    Person A must then rest for one minute. Next, Person B runs on the same spot for exactly 30 seconds, lifting their knees up high.    When Person B finished running for 30 seconds, Person A takes Person B’s pulse and records it in the table.    Person B must then rest for one minute. Steps 2-7 is repeated with the running time increased to 60 seconds. Steps 2-7 is repeated with the running time increased to 90 seconds.   

Look at Text 3 and Text 1: Text 3, sentence 15, states the following: “It can therefore be seen that many social media health campaigns do not achieve their main objective, which is to change behaviour.” What evidence given in Text 1 contradicts this argument? (Write an answer)

Identify the reactant(s) in the chemical reaction, CO2 + H2O

Perform the indicated operation. Write the result in standard form.(9 + 5i) + (-5 – 8i) + 9i

Solve the equation using the zero-product property.2×2 = -27x – 81

Which of the following is not considered necessary to ensure your premises meet GMP design standards:    

Which of the following statements regarding IR spectroscopy is CORRECT?

Enzymes can be best said to operate by:

Which of the following amino acids can participate in a salt-bridge, via its side chain?