What synapomorphy (shared, derived trait) distinguishes animals as a monophyletic group, distinct from choanoflagellates?
A. no cell walls
B. multicellularity
C. heterotrophy
D. coloniality
Ans: B. multicellularity
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Variation at the molecular level of a gene is called a(n) _________
A. nucleotide B. chromosome C. allele D. trait E. None of the answers are correct
What happens when living R strain Streptococcus pneumoniae bacteria are mixed with heat-killed S
strain Streptococcus pneumoniae bacteria?
a. The S strain bacteria come back to life. b. The R strain bacteria are killed, and the S strain bacteria remain dead. c. The R strain bacteria are transformed into S strain bacteria. d. The S strain bacteria are transformed into R strain bacteria. e. The R strain bacteria are killed, and the S strain bacteria come back to life.
When is preimplantation diagnosis performed?
a. before in vitro fertilization takes place b. when the embryo has at least 100 cells c. when the embryo is at the 8 cell stage d. when the embryo becomes a fetus at 8 weeks e. shortly after birth
In bacterial cells, the concentration of cAMP is _______ correlated with the sugar _______.
A: negatively: glucose B: positively; maltose C: positively; lactose D: positively; glucose E: negatively; lactose