Question 1

Which germ layer is the thymus derived from?

Accepted Answer

A) ectoderm 
B) mesoderm 
C) endoderm 
A) ectoderm 
B) mesoderm 
C) endoderm

Question 2

The central cavity of the neural tube becomes the

Accepted Answer

A) cerebrum. 
B) mid-brain. 
C) cranial cavity. 
D) ventricles of the brain. 
E) epidural space. 
A) cerebrum. 
B) mid-brain. 
C) cranial cavity. 
D) ventricles of the brain. 
E) epidural space.

Question 3

What term means that both alleles are the same?

Accepted Answer

A) locus 
B) alleles 
C) homozygous 
D) heterozygous 
E) karyotype 
A) locus 
B) alleles 
C) homozygous 
D) heterozygous 
E) karyotype

Question 4

Onset of labor may result from

Accepted Answer

A) increased estrogen secretion by the placenta. 
B) increased glucocorticoid secretion by the mother. 
C) increased secretion of oxytocin by the fetus. 
D) increased progesterone secretion by the placenta. 
E) decreased prostaglandins. 
A) increased estrogen secretion by the placenta. 
B) increased glucocorticoid secretion by the mother. 
C) increased secretion of oxytocin by the fetus. 
D) increased progesterone secretion by the placenta. 
E) decreased prostaglandins.

Question 5

Placenta previa occurs when

Accepted Answer

A) a normally placed placenta tears away from the uterine wall. 
B) the placenta is formed too early. 
C) implantation occurs close to the cervix. 
D) implantation occurs in the fundus of the uterus. 
A) a normally placed placenta tears away from the uterine wall. 
B) the placenta is formed too early. 
C) implantation occurs close to the cervix. 
D) implantation occurs in the fundus of the uterus.

Question 6

The embryo is most sensitive to outside influences that can cause malformations during the

Accepted Answer

A) first two weeks after fertilization. 
B) third to the ninth weeks of development. 
C) ninth to the sixteenth weeks of development. 
D) twelfth to the twentieth weeks of development. 
E) twenty-first to twenty-sixth week of development. 
A) first two weeks after fertilization. 
B) third to the ninth weeks of development. 
C) ninth to the sixteenth weeks of development. 
D) twelfth to the twentieth weeks of development. 
E) twenty-first to twenty-sixth week of development.

Question 7

Segments of mesoderm that will form muscles are

Accepted Answer

A) mesonephros. 
B) mandibular processes. 
C) neural tube. 
D) secondary palate. 
E) somites. 
A) mesonephros. 
B) mandibular processes. 
C) neural tube. 
D) secondary palate. 
E) somites.

Question 8

A non-albino female who is a carrier for the albino allele (Aa),mates with an albino (aa)male.What is the probability that their children will be albino?

Accepted Answer

A) 0% 
B) 25% 
C) 50% 
D) 75% 
E) 100% 
A) 0% 
B) 25% 
C) 50% 
D) 75% 
E) 100%

Question 9

Genes on the X chromosomes are

Accepted Answer

A) polygenic. 
B) X-linked. 
C) simple. 
D) holandric. 
E) Y-linked. 
A) polygenic. 
B) X-linked. 
C) simple. 
D) holandric. 
E) Y-linked.

Question 10

Which gland develops from an evagination of the ectoderm in the roof of the embryonic oral cavity?

Accepted Answer

A) anterior pituitary gland 
B) posterior pituitary gland 
C) thyroid gland 
D) adrenal glands 
E) pancreas 
A) anterior pituitary gland 
B) posterior pituitary gland 
C) thyroid gland 
D) adrenal glands 
E) pancreas

Question 11

Fusion of the male and female pronuclei forms the

Accepted Answer

A) blastocyst. 
B) morula. 
C) zygote. 
D) gastrula. 
E) trophoblast. 
A) blastocyst. 
B) morula. 
C) zygote. 
D) gastrula. 
E) trophoblast.

Question 12

The olfactory bulbs and nerves develop as an evagination from the

Accepted Answer

A) myelencephalon. 
B) mesencephalon. 
C) neural crest cells. 
D) diencephalon. 
E) telencephalon. 
A) myelencephalon. 
B) mesencephalon. 
C) neural crest cells. 
D) diencephalon. 
E) telencephalon.

Question 13

The common junction of the digestive,urinary,and genital systems is the

Accepted Answer

A) cloaca. 
B) coelom. 
C) allantois. 
D) hindgut. 
E) anus. 
A) cloaca. 
B) coelom. 
C) allantois. 
D) hindgut. 
E) anus.

Question 14

Which germ layer is most muscle derived from?

Accepted Answer

A) ectoderm 
B) mesoderm 
C) endoderm 
A) ectoderm 
B) mesoderm 
C) endoderm

Question 15

Cells of the neuroectoderm become all of the following EXCEPT the

Accepted Answer

A) brain 
B) spinal cord 
C) postganglionic autonomic neurons 
D) posterior pituitary gland 
A) brain 
B) spinal cord 
C) postganglionic autonomic neurons 
D) posterior pituitary gland

Question 16

Which of the following conditions might result in stress on a fetus that has nearly completed 9 months of fetal development?

Accepted Answer

A) placental growth greater than fetal growth 
B) cramped quarters in the uterus 
C) increased O2 supply to the fetus 
D) excessive weight gain by the mother 
E) hormone fluctuations 
A) placental growth greater than fetal growth 
B) cramped quarters in the uterus 
C) increased O2 supply to the fetus 
D) excessive weight gain by the mother 
E) hormone fluctuations

Question 17

What genetic disorder is the inability to produce normal hemoglobin?

Accepted Answer

A) albinism 
B) sickle-cell disease 
C) hemophilia 
D) Down syndrome 
E) achondroplasia 
A) albinism 
B) sickle-cell disease 
C) hemophilia 
D) Down syndrome 
E) achondroplasia

Question 18

Which germ layer are the tonsils derived from?

Accepted Answer

A) ectoderm 
B) mesoderm 
C) endoderm 
A) ectoderm 
B) mesoderm 
C) endoderm

Question 19

A mistake during segregation of chromosomes is called

Accepted Answer

A) deletion. 
B) duplication. 
C) nondisjunction. 
D) point mutation. 
E) aneuploidy 
A) deletion. 
B) duplication. 
C) nondisjunction. 
D) point mutation. 
E) aneuploidy

Question 20

When stretch receptors in the cervix are stimulated by the continually increasing pressure of the fetus,afferent neurons send impulses to the maternal hypothalamus resulting in

Accepted Answer

A) increased estrogen production. 
B) increased oxytocin production. 
C) increased fetal CRH production. 
D) increased growth in the size of the placenta. 
E) decreased oxytocin production. 
A) increased estrogen production. 
B) increased oxytocin production. 
C) increased fetal CRH production. 
D) increased growth in the size of the placenta. 
E) decreased oxytocin production.

Exam 29: Development,growth,aging,and Genetics

Which germ layer is the thymus derived from?

The central cavity of the neural tube becomes the

What term means that both alleles are the same?

Onset of labor may result from

Placenta previa occurs when

The embryo is most sensitive to outside influences that can cause malformations during the

Segments of mesoderm that will form muscles are

A non-albino female who is a carrier for the albino allele (Aa),mates with an albino (aa)male.What is the probability that their children will be albino?

Genes on the X chromosomes are

Which gland develops from an evagination of the ectoderm in the roof of the embryonic oral cavity?

Fusion of the male and female pronuclei forms the

The olfactory bulbs and nerves develop as an evagination from the

The common junction of the digestive,urinary,and genital systems is the

Which germ layer is most muscle derived from?

Cells of the neuroectoderm become all of the following EXCEPT the

Which of the following conditions might result in stress on a fetus that has nearly completed 9 months of fetal development?

What genetic disorder is the inability to produce normal hemoglobin?

Which germ layer are the tonsils derived from?

A mistake during segregation of chromosomes is called

When stretch receptors in the cervix are stimulated by the continually increasing pressure of the fetus,afferent neurons send impulses to the maternal hypothalamus resulting in

The Human Organism

The Chemical Basis of Life

Cell Biology

Tissues

Integumentary System

Skeletal System: Bones and Bone Tissue

Skeletal System: Gross Anatomy

Joints and Movement

Muscular System: Histology and Physiology

Muscular System: Gross Anatomy

Functional Organization of Nervous Tissue

Spinal Cord and Spinal Nerves

Brain and Cranial Nerves

Integration of Nervous System Functions

The Special Senses

Autonomic Nervous System

Functional Organization of the Endocrine System

Endocrine Glands

Cardiovascular System: Blood

Cardiovascular System: the Heart

Cardiovascular System: Blood Vessels and Circulation

Lymphatic System and Immunity

Respiratory System

Digestive System

Nutrition,metabolism,and Temperature Regulation

Urinary System

Water,electrolyte,and Acid-Based Balance

Reproductive System

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