What stage of development involves cell division without cell growth?
A. gastrulation
B. organogenesis
C. fertilization
D. cleavage
E. neurulation
Answer: D
Biology & Microbiology
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Crossing over occurs during
a. anaphase I. b. metaphase II. c. prophase I. d. prophase II. e. telophase II.
Biology & Microbiology
Lipid bilayers are permeable only to molecules that are _______ and _______.
a. large; uncharged b. large; charged c. small; uncharged d. small; charged
Biology & Microbiology
________ are organisms such as earthworms, millipedes, and other scavengers that eat waste products and dead organic matter
Fill in the blank(s) with correct word
Biology & Microbiology
Secretory IgA antibodies are unique because they
A) have unique light chains. B) are Y-shaped molecules. C) are present in the plasma. D) are connected with J chains and short polypeptides to form dimers. E) are present in lymph nodes.
Biology & Microbiology