Epithelial tissue is characterized by _____.

Fill in the blank(s) with the appropriate word(s).


tightly packed cells

Biology & Microbiology

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Which type of white blood cells produces defensive proteins called antibodies?

A) Phagocytic cells B) T cells C) Natural killer cells D) B cells

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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:

A. inherited. B. homologous. C. analogous. D. uniform. E. evolutionary modifications.

Biology & Microbiology

Organisms usually store food in the form of a 

A. lipid. B. vitamin. C. protein. D. amino acid.

Biology & Microbiology

Conjugation in most ciliates involves a series of steps that leads to increased genetic diversity. Which one of the following choices is not one of those steps?

A. sexual reproduction B. meiosis of a haploid nucleus C. mitosis of a haploid nucleus D. mitosis of a diploid nucleus E. meiosis of a diploid nucleus

Biology & Microbiology