Which statement about connective tissue is NOT true?
A. Blood is a connective tissue that contains a fluid matrix.
B. Fibrous connective tissue includes bone and cartilage.
C. Adipose tissue provides insulation and padding in organs such as the skin.
D. Loose connective tissue contains fibroblasts, different types of fiber, and a nonliving matrix.
Answer: B
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Molecular-based phylogies place the phylum Platyhelminthes in the Protostomia. How do scientists best explain the morphological differences between flatworms and the other members of the Lophotrochozoa?
A. Modern Platyhelminthes do not have a coelom but did originate from an ancestor that had one. B. The Platyhelminthes clade separated from other clades before coeloms evolved and consequently Platyhelminthes have never had a coelom. C. Platyhelminthes originated from ancestors with a coelom and have retained it to the present time. D. Platyhelminthes evolved from an ancestor without a coelom but developed one during the course of their evolution. E. Some Platyhelminthes have a coelom but others do not and it is difficult to conclude anything about its evolution within the clade.
The same basic array of bones is modified to give rise to the wing of a bat and the fin of a porpoise. Such anatomical structures are called:
What will be an ideal response?
Cells carry out three major types of work; which of the following involves energy for cell motility and the movement of structures within cells?
A. Chemical work B. Mechanical work C. Transport work D. None of the choices are correct.
The preferred habitat of S. aureus is the
A. throat. B. urethra. C. bladder. D. nasal chamber.