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

Biology & Microbiology

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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

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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

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology