In protostomes
A) the opening formed during gastrulation becomes the mouth.
B) the opening formed during gastrulation becomes the anus.
C) there is no body cavity.
D) there is no endoderm.
Answer: A
You might also like to view...
Which of the following is not true of eukaryotic signal transduction pathways that result in the regulation of gene expression?
A. The pathway frequently begins with a signal molecule binding to a cell surface receptor. B. The signal is transduced to the nucleus. C. They generally involve the localization of a protein. D. Signal molecules are always transported into the target cellular compartment.
Monoallelic expression is associated with which of the following?
A. X-inactivation B. Genomic imprinting C. Maternal inheritance D. Extranuclear inheritance
Marfan syndrome can be caused by mutations in either of two genes involved in the disorder, but mutations in one of the genes blocks activity of the other. This means that Marfan syndrome demonstrates
A) variable expressivity and complete penetrance. B) an acquired phenotype. C) late onset and early onset. D) genetic heterogeneity and epistasis.
Which hormone has a role in both feelings of well-being and in social stress responses in both sexes?
a. oxytocin b. endorphins c. insulin-like growth factors d. epinephrine e. norepinephrine