Gastrulation produces ____
a. hollow balls of cells
b. embryos with three primary tissue layers
c. solid balls of cells
d. specific organs
e. dead tissue
ANSWER: b
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Eukaryotic and archaeal cells are able to regulate cellular processes at which of the following levels?
A. Mutational B. Translational C. Transcriptional D. Physiological E. Posttranscriptional
You are studying a newly discovered prokaryotic microorganism and are attempting to determine whether it will be classified in the domain Bacteria or in the domain Archaea. All of the following would be helpful in making that distinction except
A. Presence or absence of double-stranded circular DNA genome B. Type of membrane lipids C. Presence or absence of peptidoglycan in cell walls D. Sequence of small subunit ribosomal RNA
Trichoplax adhaerens has no nerve cells, but
scientists have discovered a. genes that encode signaling molecules. b. a response to harsh chemicals. c. movement toward a food source. d. adherence genes. e. none of these.
They cycle during which a follicle matures in the ovary is call the _________ cycle
Fill in the blank(s) with the appropriate word(s).