Which of the following statements accurately describes the process of DNA replication?
It is a conservative process where the original DNA molecule remains intact.
It involves RNA polymerase and occurs in the 3' to 5' direction.
It is a random process with no specific enzyme involvement.
It is a semi-conservative process involving DNA polymerase.
Related Questions
What would be the cardiac output of a person if his heart rate is 110 beats/min and stroke volume is 90 ml?
9790 ml
9000 ml
9900 ml
8900 ml
Doctors use stethoscope to hear the sound; produced during each cardiac cycle. The second sound is heard when:
AV node receives signal from SA node
AV valves open up
Ventricular walls vibrate due to gushing of blood from atria
Semilunar valves close down after the blood flows into vessels from ventricles
During isovolumetric contraction, which of the following statements regarding the pressure changes in the atria, ventricles, and aorta is MOST accurate?
Ventricular pressure rises, atrial pressure rises, and aortic pressure rises.
Ventricular pressure rises, atrial pressure falls, and aortic pressure initially falls slightly.
Ventricular pressure falls, atrial pressure rises, and aortic pressure falls.
Ventricular pressure falls, atrial pressure falls, and aortic pressure rises.
The second heart sound signifies the beginning of which stage in the cardiac cycle?
Ventricular diastole
Ventricular systole
Atrial systole
Atrial diastole
A patient presents with a defective mitral valve that allows backflow of blood during ventricular systole. Which of the following would be the MOST direct consequence?
Increased stroke volume and decreased left atrial pressure
Reduced stroke volume and increased left atrial pressure
Increased end-diastolic volume and decreased aortic pressure
Reduced end-diastolic volume and increased aortic pressure
What is the state of the atrioventricular valves during ventricular systole?
Closed
Open
Partially open
None of the above
Which of the following events immediately precedes the opening of the semilunar valves?
Atrial systole
Ventricular pressure exceeding arterial pressure
Closing of the atrioventricular valves
Isovolumetric relaxation
A patient's EDV is 120 mL and ESV is 70 mL. If their heart rate is 80 beats per minute, what is their cardiac output?
3 L/min
4 L/min
5 L/min
6 L/min
The first heart sound 'Lubb' occurs in which phase of the cardiac cycle?
Isometric relaxation
Atrial diastole
Ventricular systole
Ventricular diastole
What would be the heart rate of a person if the cardiac output is 5 L, blood volume in the ventricles at the end of diastole is 100 mL and at the end of ventricular systole is 50 mL?
50 beats per minute
75 beats per minute
100 beats per minute
125 beats per minute
