Which structure gives rise to the axial skeletal muscles?
a. primitive streak
b. neural tube
c. notochord
d. pharyngeal arches
e. somites
ANSWER: e
You might also like to view...
If current changes in ocean temperature and pH caused a mass extinction of today's reefbuilding organisms,
A. we would see an unprecedented mass extinction, unlike anything the earth has experienced in the past. B. we would see one more in a series of mass extinctions that have wiped out reefs at least 3 times since the first reefs appeared over 500 million years ago. C. we would see one more in a series of mass extinctions that have wiped out reefs at regular intervals – roughly every 10 million years since the first reefs were formed over 500 million years ago. D. we would see the second great mass extinction of reefs; the only previous such extinction took place at the end of the Permian. E. none of these
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.
Neurosecretory cells in the hypothalamus make ____, which are secreted into blood at the posterior pituitary.
A. adrenaline and prolactin B. prolactin and oxytocin C. antidiuretic hormone and oxytocin D. luteinizing hormone and oxytocin E. growth hormone and prolactin
The following are all functions of a typical plasma membrane except:
A. expression of cellular identity B. selective transport of certain molecules and material C. reception of information D. transport of water and bulk material E. Be permanent in composition