The form lacking a free flagellum in the developmental stage of a hemoflagellate is called the
A. promastigote.
B. trypomastigote.
C. amastigote.
D. epimastigote.
E. None of the choices are correct.
Answer: C
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The weakest symbiotic association, in which one
species simply lives better in the presence of another species is a. commensalism. b. competitive exclusion. c. mutualism. d. facultative obligate mutualism. e. parasitism.
Which of the following phases of mitosis is not matched with the appropriate activities that occur during that phase?
A) anaphase: homologous pairs separate B) telophase: new nuclear envelope forms, and the mitotic spindle disassembles C) prophase: nuclear membrane disappears D) metaphase: chromosomes line up in the center of the cell
Water has the ability to dissolve salts and carry dissolved carbon dioxide. How does this action help the human body maintain homeostasis?
A) production of energy for cells B) distribution of needed materials to the cells C) removal of waste from the cells and the body D) absorption of needed materials from the environment
Which of the following is not involved in transport of materials within a eukaryotic cell?
a) the rought endoplasmic reticulum b) lysosome c) mitochondrion d) the Golgi complex