Biology Questions

which adaption for successful development is characteristic of all embryos?

Toxins can harm a developing fetus. They usually enter the fetus by the process of

which statement best explains why some cells in the reproductive system respond to certain hormones

the endoderm is an embryo first forms during the process of

a temporary suspension of the muenstral cycle normally occurs during

Diagram how primary induction from the Spemann organizer influences the development of the dorsal-ventral axis of embryos and how secondary induction leads to vertebrate eye development.

During metamorphosis, a tadpole's tail is reduced in size by the process of _____.A. RegenerationB. ApoptosisC. oxidative phosphorylationD. re-differentiation

From earliest to latest, the overall sequence of early development proceeds in which of the following sequences?A. first cell division → synthesis of embryo's DNA begins → acrosomal reaction → cortical reactionB. cortical reaction → synthesis of embryo's DNA begins → acrosomal reaction → first cell divisionC. cortical reaction → acrosomal reaction → first cell division → synthesis of embryo's DNA beginsD. acrosomal reaction → cortical reaction → synthesis of embryo's DNA begins → first cell division

What does not normally happen during gastrulation?A. Three embryonic germ layers are establishedB. A cavity forms inside the developing embryo that will become the primitive gutC. The embryo increases dramatically in sizeD. Embryonic germ layers begin to be committed toward distinct developmental fatesE. Cell migrations are a prominent feature of this developmental stage

It's possible that radial symmetry is not the ancestral condition for cnidarians, but rather that they originally had bilateral symmetry and then reverted to radial symmetry, similar to adult echinoderms. A taxonomic grouping called Bilateralacea, that included both (and only) cnidarians and echinoderms would be considered A. paraphyleticB. monophyleticC. polyphyleticD. biphyletic

The __________ eventually develop into vertebrae, ribs, and muscles and are found along the sides of the __________.A. somites; notochordB. neural tube cells; notochordC. blastopore cells; dorsal lipD. neural crest cells; dorsal lip

gill arches, sensory ganglia, schwann cells, and adremal medulla origins

salivary gland formation in drosophila

epidermis, hair, skin, inner ear, lens of eye origins

circulatory system (blood, vessels, and heart) origin

outer covering of internal organs and lining of thoracic and abdominal cavities (integuments) origin

Which embryonic germ layer has as one of its fates to become brain and nervous system?A. MesodermB. ArchenteronC. EndodermD. Ectoderm

Which of the following is a correct description of the fate of the germ layers?A. The mesoderm gives rise to the notochord.B. The endoderm gives rise to the hair follicles.C. The ectoderm gives rise to the liver.D. The mesoderm gives rise to the lungs.

Select the incorrectly matched germ layer and its developmental tissue fate.A. ectoderm—lining of the digestive tractB. ectoderm—epidermisC. mesoderm—blood vesselsD. mesoderm—gonadsE. endoderm—lining of the respiratory tract

If the blastopore dorsal lip is grafted from one frog embryo onto a second embryo, the second dorsal lip willA. change the polarity of the adjacent segments.B. block gastrulation.C. change the developmental fate of the surrounding cells.D. change the prospective potency of the surrounding cells.