Genetics and Developmental Biology

Cells transplanted from the neural tube of a frog embryo to the ventral part of

Cells transplanted from the neural tube of a frog embryo to the ventral part of

 Cells transplanted from the neural tube of a frog embryo to the ventral part of another embryo develop into nervous system tissues. This result indicates that the transplanted cells were   

A) determined.
B) totipotent.
C)

ppk   3353   1 Reply

duddy

Which of the following is common to the development of both birds and mammals?

Which of the following is common to the development of both birds and mammals?

Which of the following is common to the development of both birds and mammals?     
A) epiblast and hypoblast
B) trophoblast
C) holoblastic cleavage
D) gray crescent
E) yolk plug

ppk   3075   1 Reply

duddy

The archenteron develops into

The archenteron develops into

The archenteron develops into     
A) the blastocoel.
B) the lumen of the digestive tract.
C) the endoderm.
D) the mesoderm.
E) the placenta.

ppk   1793   1 Reply

duddy

The cortical reaction of sea urchin eggs functions directly in

The cortical reaction of sea urchin eggs functions directly in

The cortical reaction of sea urchin eggs functions directly in 
A) the production of a fast block to polyspermy.
B) the fusion of egg and sperm nuclei.
C) the release of hydrolytic enzymes from the sperm.
D) the generation o

ppk   2918   1 Reply

duddy

If the apical ectodermal ridge is surgically removed from an embryo, it will los

If the apical ectodermal ridge is surgically removed from an embryo, it will los

 If the apical ectodermal ridge is surgically removed from an embryo, it will lose     
A) guidance signals needed for correct gastrulation.
B) the developmental substrate for the gonads.
C) unequal cytokinesis of blastomeres

ppk   2421   1 Reply

duddy

What structural adaptation in chickens allows them to lay their eggs in arid en

What structural adaptation in chickens allows them to lay their eggs in arid en

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

A) extraembryonic membranes
B) yolk
C) development of the brain from ectoderm
D) gastrulation

ppk   2269   1 Reply

bio_man

During gastrulation in frog embryos, fibronectin

During gastrulation in frog embryos, fibronectin

During gastrulation in frog embryos, fibronectin   
A) provides the pigment that accumulates in the primitive streak.
B) regulates mRNA movement out of the nucleus of a moving cell.
C) regulates actin-myosin interactions in

ppk   1722   1 Reply

bio_man

Which of the following is the anatomical axis that is largely symmetrical in bot

Which of the following is the anatomical axis that is largely symmetrical in bot

Which of the following is the anatomical axis that is largely symmetrical in both frogs and humans?   
A) animal to vegetal
B) medial to lateral
C) dorsal to ventral
D) anterior to posterior
E) rostral to caudal

ppk   1820   1 Reply

bio_man

Which of the following is a correct description of an anatomical relationship?

Which of the following is a correct description of an anatomical relationship?

 Which of the following is a correct description of an anatomical relationship?   
A) The mesoderm gives rise to the lungs.      B) The endoderm gives rise to the hair follicles.
C) The ectoderm gives rise to the liver.&

ppk   2204   1 Reply

bio_man

The cortical reaction functions directly in the

The cortical reaction functions directly in the

The cortical reaction functions directly in the   
A) fusion of egg and sperm nuclei.
B) release of hydrolytic enzymes from the sperm cell.
C) generation of a nerve-like impulse by the egg cell.
D) production of a fast

ppk   3021   1 Reply

bio_man

The primitive streak in a bird is the functional equivalent of

The primitive streak in a bird is the functional equivalent of

 The primitive streak in a bird is the functional equivalent of     
A) polar bodies in a sea urchin.
B) the lip of the blastopore in the frog.
C) neural crest cells in a mammal.
D) the archenteron in a frog.

ppk   2250   1 Reply

vinas09

Extraembryonic membranes develop in

Extraembryonic membranes develop in

Extraembryonic membranes develop in     
A) birds, but not mammals or lizards.
B) mammals and birds, but not lizards.
C) mammals, birds, and lizards.
D) mammals, but not birds or lizards.
E) lizards, but not m

ppk   3136   1 Reply

vinas09

Changes in the shape of a cell usually involve a reorganization of the

Changes in the shape of a cell usually involve a reorganization of the

Changes in the shape of a cell usually involve a reorganization of the     
A) cytoskeleton.
B) nucleus.
C) extracellular matrix.
D) transport proteins.
E) nucleolus.

ppk   2210   2 Replies

krausy22

The migratory neural crest cells

The migratory neural crest cells

The migratory neural crest cells   
A) form most of the central nervous system.
B) form neural and non-neural structures in the periphery.
C) serve as precursor cells for the notochord.
D) form the lining of the lungs and of

ppk   1460   1 Reply

biolove

The mesoderm was probably stained with a

The mesoderm was probably stained with a

 The mesoderm was probably stained with a     
B) red color.
C) yellow color.
D) blue color.
E) green color.

ppk   1255   1 Reply

biolove

The ectoderm should give rise to tissues containing

The ectoderm should give rise to tissues containing

The ectoderm should give rise to tissues containing     
A) red and blue colors.
B) yellow and purple colors.
C) green and red colors.
D) red and yellow colors.
E) purple and green colors.

ppk   2331   1 Reply

biolove

The nematode Caenorhabditis elegans

The nematode Caenorhabditis elegans

The nematode Caenorhabditis elegans   
A) has only a single chromosome, which has been fully sequenced.
B) has about 1,000 genes, each of which has been fully sequenced.
C) is composed of about 1,000 cells, in which the deve

ppk   862   1 Reply

biolove

The arrangement of organs and tissues in their characteristic places in 3-D spac

The arrangement of organs and tissues in their characteristic places in 3-D spac

The arrangement of organs and tissues in their characteristic places in 3-D space defines     
A) determination.
B) induction.
C) pattern formation.
D) organogenesis.
E) differentiation.

ppk   2127   1 Reply

biolove

The vertebrate ectoderm is the origin of the

The vertebrate ectoderm is the origin of the

The vertebrate ectoderm is the origin of the     
A) nervous system.
B) kidneys.
C) heart.
D) liver.
E) pancreas.

ppk   3161   1 Reply

bio_man

Changes in both cell shape and cell position occur extensively during

Changes in both cell shape and cell position occur extensively during

Changes in both cell shape and cell position occur extensively during     
A) gastrulation, organogenesis, and cleavage.
B) gastrulation, but not organogenesis or cleavage.
C) cleavage, but not gastrulation or organogen

ppk   3262   1 Reply

bio_man

Uterine implantation due to enzymatic digestion of the endometrium is initiated

Uterine implantation due to enzymatic digestion of the endometrium is initiated

Uterine implantation due to enzymatic digestion of the endometrium is initiated by the     
A) chorion.
B) trophoblast.
C) endoderm.
D) mesoderm.
E) inner cell mass.

ppk   2996   1 Reply

bio_man

At the time of implantation, the human embryo is called a

At the time of implantation, the human embryo is called a

At the time of implantation, the human embryo is called a     
A) blastocyst.      B) gastrula.      C) somite.      D) zygote.      E) fetus.

ppk   1752   1 Reply

bio_man

The least amount of yolk would be found in the egg of a

The least amount of yolk would be found in the egg of a

The least amount of yolk would be found in the egg of a   
A) eutherian (placental) mammal.
B) fish.
C) reptile.
D) bird.
E) frog.

ppk   1718   1 Reply

bio_man

Two primary factors in shaping the polarity of the body axes in chick embryos ar

Two primary factors in shaping the polarity of the body axes in chick embryos ar

 Two primary factors in shaping the polarity of the body axes in chick embryos are   
A) gravity and pH.
B) location of sperm penetration and cortical reaction.
C) moisture and mucus.
D) salt gradients and membrane potentials

ppk   1732   1 Reply

bio_man

The developmental precursors to the gonadal tissues of C. elegans uniquely conta

The developmental precursors to the gonadal tissues of C. elegans uniquely conta

 The developmental precursors to the gonadal tissues of C. elegans uniquely contain
A) proteins of maternal origin.
B) P granules of mRNA and protein.
C) high concentrations of potassium ions.
D) haploid proteins.
E) T tubule

ppk   1137   1 Reply

bio_man

Animal cells that are present only for a brief developmental phase will, follow

Animal cells that are present only for a brief developmental phase will, follow

Animal cells that are present only for a brief developmental phase will, following completion of that phase, undergo     

A) re-differentiation.
B) diapause.
C) meiosis.
D) apoptosis
E) oxidative phosphorylati

ppk   1959   1 Reply

bio_man

Human trophoblasts

Human trophoblasts

Human trophoblasts     
A) form the inner cell mass.
B) are the precursors of the mesoderm.
C) form from ectoderm.
D) are of maternal origin and function in embryo gas exchange.
E) are of embryonic origin and

ppk   663   1 Reply

bio_man

The first cavity formed during sea urchin development is the

The first cavity formed during sea urchin development is the

The first cavity formed during sea urchin development is the     
A) anus.      B) blastopore.      C) blastocoel.      D) mouth.

ppk   1609   1 Reply

bio_man

Select the choice that correctly associates the organ with its embryonic sources

Select the choice that correctly associates the organ with its embryonic sources

63) Select the choice that correctly associates the organ with its embryonic sources.     
A) skin?endoderm and mesoderm
B) anterior pituitary gland?mesoderm and endoderm
C) thyroid gland?mesoderm and ectoderm

ppk   1620   1 Reply

bio_man

To meet a zygote's metabolic and developmental requirements,

To meet a zygote's metabolic and developmental requirements,

 To meet a zygote's metabolic and developmental requirements, 
A) the haploid DNA in the nucleus must be transcribed.
B) paternal RNA and maternal proteins must be present.
C) maternal RNA and maternal proteins must be prese

ppk   2626   1 Reply

bio_man

In all vertebrate animals, development requires

In all vertebrate animals, development requires

In all vertebrate animals, development requires     
A) an amnion.
B) a large supply of yolk.
C) a primitive streak.
D) an aqueous environment.
E) extraembryonic membranes

ppk   2808   1 Reply

bio_man

The small portion of the embryo that will become its dorsal side develops from t

The small portion of the embryo that will become its dorsal side develops from t

The small portion of the embryo that will become its dorsal side develops from the     
A) gray crescent.
B) morula.
C) blastocoel.
D) primitive streak.
E) archenteron.

ppk   1662   1 Reply

kellyk412

The pattern of embryonic development in which only the cells lacking yolk subseq

The pattern of embryonic development in which only the cells lacking yolk subseq

The pattern of embryonic development in which only the cells lacking yolk subsequently undergo cleavage is called     

A) holoblastic development, which is typical of amphibians.
B) arcadian development, which is typic

ppk   2037   1 Reply

duddy

The vegetal pole of the zygote differs from the animal pole in that

The vegetal pole of the zygote differs from the animal pole in that

The vegetal pole of the zygote differs from the animal pole in that     
A) the blastomeres originate only in the vegetal pole.
B) the polar bodies bud from this region.
C) the vegetal pole cells undergo mitosis but not cytok

ppk   2330   1 Reply

duddy

An embryo with meroblastic cleavage, extraembryonic membranes, and a primitive s

An embryo with meroblastic cleavage, extraembryonic membranes, and a primitive s

An embryo with meroblastic cleavage, extraembryonic membranes, and a primitive streak must be that of   
A) an insect.
B) a sea urchin.
C) an amphibian.
D) a bird.
E) a fish.

ppk   2315   1 Reply

duddy

Meroblastic cleavage occurs in

Meroblastic cleavage occurs in

 Meroblastic cleavage occurs in   
A) humans, but not sea urchins or birds.
B) birds, but not sea urchins or humans.
C) both sea urchins and birds, but not humans.
D) sea urchins, but not humans or birds.
E) both h

ppk   2947   1 Reply

duddy

Which of the following correctly displays the sequence of developmental mileston

Which of the following correctly displays the sequence of developmental mileston

 Which of the following correctly displays the sequence of developmental milestones?     
A) morula ? cleavage ? gastrula ? blastula
B) cleavage ? morula ? blastula ? gastrula
C) cleavage ? gastrula ? morula ? blastula
D

ppk   3064   1 Reply

duddy

Cells move to new positions as an embryo establishes its three germ tissue laye

Cells move to new positions as an embryo establishes its three germ tissue laye

Cells move to new positions as an embryo establishes its three germ tissue layers during     
A) cleavage.
B) determination.
C) fertilization.
D) gastrulation.
E) induction.

ppk   2893   1 Reply

duddy

In a developing frog embryo, most of the yolk is

In a developing frog embryo, most of the yolk is

In a developing frog embryo, most of the yolk is     
A) located near the vegetal pole.
B) distributed equally throughout the embryo.
C) found within the blastocoels.
D) found within the cleavage furrow.
E) lo

ppk   2227   1 Reply

duddy

In a frog embryo, gastrulation

In a frog embryo, gastrulation

In a frog embryo, gastrulation     
A) occurs along the primitive streak in the animal hemisphere.
B) is impossible because of the large amount of yolk in the ovum.
C) proceeds by involution as cells roll over the lip o

ppk   2867   1 Reply

duddy