Currently ____________ is/are thought to have been the genetic material of the earliest cells. 

A. proteins
B. DNA
C. RNA
D. amino acids


C. RNA

Biology & Microbiology

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Why are systemic fungal infections seen only in a subset of the population, even though most people contact fungi and fungal spores in soil and dust all of the time?

Contrast the epidemiology of systemic fungal infections with giardiasis, which infects virtually everyone that comes in contact with the pathogen. What will be an ideal response?

Biology & Microbiology

Which of these is the portion of the heartbeat that involves contraction of the heart?

A) cardiac cycle B) pacemaker C) diastole D) systole

Biology & Microbiology

The type of body cavity seen in the roundworms that develops between mesoderm and endoderm layers is a

A. pseudocoelom. B. mantle. C. coelom. D. acoelom.

Biology & Microbiology

All Entamoeba are harmful to their hosts.

Answer the following statement true (T) or false (F)

Biology & Microbiology