Paul observes an amoeba engulfing food during a science laboratory class. which part of its cell does the amoeba use to engulf the food?
a.
cell wall
b.
cytoplasm
c.
nucleus
d.
vacuole
e.
silicate skeleton

How do disease caused by bacteria and disease caused by viruses react to antibiotics?

According to the rna world hypothesis, rna acted as the genetic material and catalyzed reactions in ancient cells. what conclusion can you draw from this?               a.  this implies that dna and proteins aren't essential in cells today.    b.  this implies that rna can catalyze any chemical reaction that enzymes catalyze.    c.  this implies that if a cell has a problem with its dna, its rna can compensate for the damaged dna.    d.  this implies that dna and proteins evolved after rna.

Explain how negative feedback caused the changes in plasma glucagon concentration observed during the experiment.