Which prokaryotic nutritional groups use CO2 and sunlight to produce energy?
A. Photoautotrophs
B. Chemoautotrophs
C. Photoheterotrophs
D. Chemoheterotrophs
E. Methanoheterotrophs
Answer: A
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What is the function of the centromere?
A. to attach the DNA to the plasma membrane B. to attach the chromosome to the spindle C. to attach the sister chromatids to each other D. to organize the microtubules to form a spindle
B cells present antigens to helper T cells via __________________.
What will be an ideal response?
At rest, each cardiac cycle takes 0.8 seconds and during half of that time (0.4 seconds), both atria and ventricles are relaxed.
a. true b. false
Blood pressure is the measure of pressure in a large artery and is recorded as two numbers (120/80). These numbers stand for the pressure
A. while the heart is contracting over the pressure while the heart is relaxed. B. while the subject is exercising over the pressure while at rest. C. while the heart is relaxed over the pressure while the heart is contracting. D. in the pulmonary system over the pressure in the systemic system.