Which of the following is the most likely explanation for the loss of mitochondria in Excavates?

a. their flagella
b. their aquatic habitat
c. their similarity to bacteria
d. their parasitic lifestyle


Ans: d. their parasitic lifestyle

Biology & Microbiology

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The statements about transport of Ca2+ from the cytosol (low Ca2+ concentration) into the endoplasmic reticulum (high Ca2+ concentration) are true EXCEPT which of the following?

A. Calcium movement involves the use of a pump. B. Calcium movement involves active transport. C. Calcium movement occurs by facilitated diffusion using a transporter protein. D. Calcium movement requires energy. E. Calcium movement occurs through a transmembrane protein.

Biology & Microbiology

Spiny skinned organisms that have a water vascular system belong to the phylum:

a. Echinodermata. b. Chordata. c. Bryozoa. d. Arthropoda. e. Mollusca.

Biology & Microbiology

In any environment, both biotic and abiotic factors influence the population size of each type of organism. Which of the following is a biotic limiting factor for populations living in a desert ecosystem?

A) daytime temperatures B) water availability C) nitrogen content in soil D) available edible plant biomass

Biology & Microbiology

Which of the following do humans not have taste buds specialized to sense?

A. Salty B. Sweet C. Sour D. Bitter E. Vitamins

Biology & Microbiology