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
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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.
Spiny skinned organisms that have a water vascular system belong to the phylum:
a. Echinodermata. b. Chordata. c. Bryozoa. d. Arthropoda. e. Mollusca.
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
Which of the following do humans not have taste buds specialized to sense?
A. Salty B. Sweet C. Sour D. Bitter E. Vitamins