Members of the phylum ____ are the simplest organisms with a separate mouth and anus
a. Platyhelminthes
b. Ctenophora
c. Placozoa
d. Porifera
e. Cnidaria
b
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If cells of an individual contain the same set of genes, how do these cells become different from each other during development?
A) Different cell type-specific regulatory elements in DNA are created during development. B) Different cell type-specific regulatory elements in DNA are selectively lost during development. C) Differences in extracellular signals received by each cell lead to differences in the types of regulatory proteins present in each cell. D) Differences develop in promoter sequences that lead to different signals being produced by each type of cell.
A ____ is formed when a ____ is dissolved in a ____
a. solution; solute; solvent b. solute; solvent; solution c. solution; solvent; solute d. solvent; solution; solute e. solvent; solute; solution
What do you know about sex determination in animals? Pick the correct statement from the list below.
A: In all animals, females normally have two XX chromosomes. B: In all animals, males have two different sex chromosomes; i.e., are heterogametic. C: Dioecious organisms, the two sexes are different individuals that differ in their chromosomal make-up. D: In both fruit flies and mammals, individuals with a Y chromosome always develop as males.
Which of the following statements does not describe a way in which fungi differ from plants?
A. Fungi have nuclear mitosis. B. Fungi have cell walls made of cellulose. C. Fungi have filamentous bodies. D. Fungi have nonmotile sperm. E. Fungi are heterotrophic.