The partial twinning that led to the births of conjoined twins Abby and Brittany Hensel must have happened during the first two weeks of gestation, because the girls

A) share tissues that descend from ectoderm, endoderm, and mesoderm.
B) share only tissues derived from mesoderm.
C) were born on time.
D) have two separate nervous systems.


A) share tissues that descend from ectoderm, endoderm, and mesoderm.

Biology & Microbiology

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Organisms that require increased pressure for optimum growth are called

A. osmotolerant. B. osmophilic. C. barotolerant. D. barophilic.

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Feeding behavior with a high energy intake-to-expenditure ratio is called _____

A) herbivory B) autotrophy C) heterotrophy D) search scavenging E) optimal foraging

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What kind of proteins do the ras proto-oncogenes encode?

A. Signal transduction proteins D. DNA polymerases B. Tumor-suppressing proteins E. Mitotic spindle proteins C. DNA repair proteins

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Lysosomes result from the endocytosis of food particles by eukaryotic cells.

Answer the following statement true (T) or false (F)

Biology & Microbiology