Ch 47

The formation of the fertilization membrane and the slow block to polyspermy are dependent on the:

• entrance of potassium ions into the egg

• departure of sodium ions from the egg

• entrance of calcium ions into the egg

• departure of hydrogen ions from the egg

Diploidy is first reestablished following

• fertilization

• gastrulation

• parthenogenesis

• organogenesis

• ovulation

Development must occur in the order of which of the following sequences?

• fertilization to cleavage to blastula to organogenesis to gastrula

• fertilization to cleavage to blastula to gastrula to organogenesis

• cleavage to blastula to gastrula to fertilization to organogenesis

• gastrula to organogenesis to blastula to cleavage to fertilization

• organogenesis to cleavage to gastrula to blastula to fertilization

Tags

NGSS.HS-LS1-4

The anatomical axis that is largely symmetrical in nematodes, echinoderms, and vertebrates is

• right to left

• dorsal to ventral

• anterior to posterior

• animal to vegetal

Which is the correct order of events between the release of gametes into the water and fertilization in sea urchins?

1)Egg’s jelly coat is digested.

2)Sperm head contacts the egg surface.

3)Soluble molecules from egg jelly coat attract sperm.

4)Fusion of sperm and egg plasma membranes occurs.

5)Hydrolytic enzymes are discharged from the acrosome.

6)The acrosomal process is formed.

7)Protein molecules on the acrosomal process bind receptor proteins in the egg plasma membrane.

8)The acrosomal process penetrates the egg jelly coat.

• 1, 2, 3, 4, 5, 6, 7, 8

• 1, 3, 2, 4, 8, 5, 6, 7

• 3, 2, 5, 1, 6, 8, 7, 4

• 3, 2, 5, 1, 6, 7, 4, 8

Which embryonic germ layer is incorrectly matched with one of its derivatives?

• endoderm—nervous and sensory systems

• mesoderm—excretory and reproductive systems (excluding germ cells)

• ectoderm—jaws and teeth

Tags

NGSS.HS-LS1-4

Mutations that block the functioning of monocilia have been implicated in which of the following conditions?

• cancer

• Down syndrome

• cystic kidney disease

• Kartagener's syndrome

Tags

NGSS.HS-LS3-2

The cortical reaction of sea urchin eggs functions directly in:

• the formation of a fertilization envelope

• the production of a fast block to polyspermy

• generation of an electrical impulse by the egg

• the fusion of egg and sperm nuclei

What structural adaptation in chickens allows them to lay their eggs in arid (dry) environments rather than in water?

• extraembryonic membranes

• yolk

• cleavage

• gastrulation

If an egg cell were treated with EDTA, a chemical that binds calcium and magnesium ions,

• the acrosomal reaction would be blocked

• the fusion of sperm and egg nuclei would brlocked

• the fast block to polyspermy would not occur

• the fertilization envelope would not form