Which of the following structures are responsible for the shape of a cell?
a. cell junctions
b. microvilli
c. cytoskeleton
d. organelles
Ans: c. cytoskeleton
Biology & Microbiology
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Identify the structure indicated by #1:
A. uterus B. cervix C. vagina D. ovary E. fallopian tube or oviduct
Biology & Microbiology
What type of cell activates a B cell?
a. neutrophil b. basophil c. T helper cell d. cytotoxic T cell
Biology & Microbiology
Male peacocks having more ornate plumage than their female counterparts is an example of which of the following features of ecological behavior?
a. monogamy b. sexual dimorphism c. sexual selection d. territoriality
Biology & Microbiology
If reinforcers from one unchanged source are depleted and responding in another source increases, we call this
a. Negative contrast b. Substitutability c. Positive Contrast d. Anticipatory Contrast
Biology & Microbiology