After fertilization, the first stage of the development is: A) cleavage B) gastr

ID: 97218 • Letter: A

Question

After fertilization, the first stage of the development is:

A) cleavage B) gastrulation C) organogenesis D) germ layer formation

Sea urchins are good models to study development because the______ like us.

A) produce amniotic eggs B) use internal fertilization C)are deuterostomes D are chordates

which of the following are correct characteristics of sea urchins?

A) they have a sac body plan, a coelom, and bilateral symmetry as adults

B) they have a tube body plan, are chordate, and produce amniotic eggs

C) they are vertebrates with a true coelom and are hermaphrodites

D) they have a tube body plan, a true coelom, and deuterostome development

Some, but not all, chordates:

A) are vertebrates

B) have a dorsal hollow nerve cord

C) possess a notocord at some stage of develpment

D) have a post- anal tail at some stage of development

A sea urchin embryo and a pig and chick embryo are similar in that they:

A) show all the chordate characteristics and are amniotes

B) show all the deuterostomes characteristics even though they are not both chordates

C) show all the chordates characteristics even though they are not vertebrates

D) show all of the vertebrates characteristics and are protostomes

Answers: -

1.option "A"-cleavage.

2.option "C"-are dueterosomes".

3.option "D"- they have tube body plan,true coelom and deuterostome development.

4.option "A"-are vertebrates.yes all chordates are not vertebrates.

5.option "B"-show all the deuterostomes characteristics even though they are not both chordates.

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