Biology Test Questions Developmental Biology DAT

Which hormone sees a significant increase immediately during ovulation?
A. FSH
B. LH
C. Estrogen
D. Progesterone
E. hCG
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Which hormone sees a significant increase immediately during ovulation?
A. FSH
B. LH
C. Estrogen
D. Progesterone
E. hCG
B. LH
The cortical reaction directly functions by
A. Formation of a fertilization membrane
B. Generation of a nerve-like impulse by the egg cell
C. Production of a fast block to polyspermy
D. Fusion of egg and sperm nuclei
E. Release of hydrolytic enzymes from the sperm cell
A. Formation of a fertilization membrane
What is the correct order of stages in pre-embryonic development?
A. Cleavage, zygote, blastocyst, morula, implantation
B. Cleavage, zygote, morula, blastocyst, implantation
C. Zygote, cleavage, morula, blastocyst, implantation
D. Zygote, cleavage, blastocyst, morula, implantation
E. Zygote, morula, blastocyst, implantation, cleavage
C. Zygote, cleavage, morula, blastocyst, implantation
During the process of gastrulation, which structure is formed even in the most primitive organisms?
A. Liver
B. Spinal cord
C. Gut tube
D. Lungs
E. Kidney
C. Gut tube
A breeder attempts to cross an alpaca with a llama for thicker wool and finds that the hybrid offspring can rarely live for more than a few days. Which of the following best describes what this outcome probably resulted from?
A. Prezygotic reproductive isolation
B. Postzygotic reproductive isolation
C. Polyploidy
D. Mechanical isolation
E. Sympatric speciation
B. Postzygotic reproductive isolation
Which of the following statements best describes the process of gametogenesis?
A. Primary spermatocytes undergo prophase I of meiosis in the ovary and complete meiosis in adults after puberty
B. Primary spermatocytes complete meiosis to form 4 sperm while still in the ovary
C. Primary oocytes undergo prophase I of meiosis in the ovary and complete meiosis I in adults after puberty
D. Primary oocytes complete meiosis to form 4 eggs while still in the ovary
E. Both Oogenesis and Spermatogenesis produce 4 gametes upon the completion of meiosis
C. Primary oocytes undergo prophase I of meiosis in the ovary and complete meiosis I in adults after puberty
What germ layer forms most of the peripheral nervous sytem?
A. Ectoderm
B. Endoderm
C. Mesoderm
D. Neural crest
E. Epidermis
A. Ectoderm
Which of the following describes a gastrula in embryonic development?
A. Leads to formation of the nervous system
B. Zygote composed of eight or more cells
C. Embryo consisting of three germ layers
D. Is formed immediately following fertilization
E. Embryo younger than one week
C. Embryo consisting of three germ layers
In organisms such as birds and reptiles, the yolk sac contains nourishing yolk. However, in humans the yolk sac serves a different purpose. Which of the following is its purpose in humans?
A. Food storage site for embryo
B. First site of red blood cell synthesis
C. Site to excrete wastes
D. Site for white blood cell synthesis
E. Oxygen transport
B. First site of red blood cell synthesis
Which of the following triggers menstruation?
A. Increase in estrogen levels
B. Increase in estrogen and progesterone levels
C. Increase in estrogen and decrease in progesterone levels
D. Decrease in estrogen and increase in progesterone levels
E. Decrease in estrogen and progesterone levels
E. Decrease in estrogen and progesterone levels
Which embryonic layer forms the notochord? A. Endoderm B. Mesoderm C. Ectoderm D. Blastocoel E. ArchenteronB. MesodermDuring embryonic development, what develops directly above the notochord? A. Spinal ganglion B. Mesoderm C. White matter D. Spinal cord E. Neural tubeE. Neural tube