What process best characterizes Ca2+ movement from the cytosol (low Ca2+ concentration) into the endoplasmic reticulum (high Ca2+ concentration)?
A. Calcium movement occurs by passive diffusion.
B. Calcium movement is spontaneous.
C. Calcium movement occurs by facilitated diffusion using a transporter protein.
D. Calcium movement involves active transport.
E. Calcium movement does not require energy.
Answer: D
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Which of the following statements is false?
a. Cell migration during embryonic development is an example of chemotaxis. b. Embryonic neurons follow adhesive cells as they migrate. c. Cells continue migrating throughout the entire embryonic process. d. Morphogenesis depends upon local growth. e. Controlled cell death can be involved in morphogenesis.
Choanocytes are a characteristic of members of the phylum Cnidaria
____________________ Indicate whether the statement is true or false.
When early G1 phase cells are fused with S-phase cells using polyethylene glycol (PEG), which of the following events would you expect to be induced?
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Viruses contain ________ as their genetic material.
A. carbohydrate B. DNA and RNA C. RNA or DNA D. protein