Humans contract Chagas disease when the reduviid bug defecates while taking a blood meal and the parasites in the feces are rubbed or scratched into the bite wound or onto mucosal surfaces. Which stage in the blood infects the host cells?
a. Amastigote
b. Epimastigote
c. Trypomastigote
d. Promastigote
C
Humans contract Chagas disease when the reduviid bug defecates while taking a blood meal and the parasites in the feces are rubbed or scratched into the bite wound or onto mucosal surfaces. Only the trypomastigotes are found free in the peripheral blood.
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Molecules that come from the food we eat provide energy for the amazing work that goes on inside of our cells. This energy, stored inside of our food, is a form of _____ .
A) potential energy called chemical energy B) potential energy called entropy C) kinetic energy called heat D) electrical energy called heat
You have identified a chromosome that has both p and q arms, but notice that the p arms are composed of highly repetitive DNA. What type of chromosome is this?
A) metacentric B) submetacentric C) acrocentric D) subacrocentric E) telocentric
Chiasmata (or chiasma) provide evidence of
A) meiosis. B) chromosomal aberration. C) fertilization. D) spindle fiber formation. E) crossing over.
Arrange these muscle tissue groupings in order, from most inclusive to least inclusive: sarcomere, motor unit, thick and thin filaments, myofibril, muscle fiber
What will be an ideal response?