Question 1

What stimulates secretion of testosterone by Leydig cells?

Accepted Answer

A) Estradiol 
B) FSH 
C) LH 
D) Testosterone 
E) Progesterone 
A) Estradiol 
B) FSH 
C) LH 
D) Testosterone 
E) Progesterone

Question 2

Why did internal fertilization likely evolve?

Accepted Answer

A) To increase the chances of successful fertilization. 
B) As a response to copulation. 
C) Because there were no safe places to lay eggs. 
D) As an adaptation to life in a terrestrial environment. 
A) To increase the chances of successful fertilization. 
B) As a response to copulation. 
C) Because there were no safe places to lay eggs. 
D) As an adaptation to life in a terrestrial environment.

Question 3

At a party,one of your friends has just revealed that he and his wife are trying to conceive.What do you advise him to avoid at the party?

Accepted Answer

A) The loud music 
B) The raw vegetable appetizers 
C) The hot tub 
D) The melted cheese fondue 
A) The loud music 
B) The raw vegetable appetizers 
C) The hot tub 
D) The melted cheese fondue

Question 4

In males,sterilization involves a vasectomy,which removes a portion of what structure?

Accepted Answer

A) vas deferens 
B) epididymis 
C) seminiferous tubules 
D) Sertoli cells 
A) vas deferens 
B) epididymis 
C) seminiferous tubules 
D) Sertoli cells

Question 5

A 38-year-old woman is going to ovulate in about a week.For how long has the primary oocyte in her Graafian follicle been arrested at prophase I of meiosis?

Accepted Answer

A) About a day 
B) 1 week 
C) 3 weeks 
D) 38 years 
A) About a day 
B) 1 week 
C) 3 weeks 
D) 38 years

Question 6

The scrotum is a sac-like structure outside the abdomen in which the testes are suspended.Why is this structure essential?

Accepted Answer

A) Sperm must be closer to the penis to be ejaculated. 
B) There is not enough space in the abdomen to grow properly. 
C) Lower temperature is required for normal development of sperm. 
D) There is too much hormonal influence if they remain in the abdomen. 
A) Sperm must be closer to the penis to be ejaculated. 
B) There is not enough space in the abdomen to grow properly. 
C) Lower temperature is required for normal development of sperm. 
D) There is too much hormonal influence if they remain in the abdomen.

Question 7

Select the correct sequence of events of the human menstrual phase,beginning and ending with the menstrual cycle.

Accepted Answer

A) menstrual phase → proliferative phase → ovulation → secretory phase → menstrual phase 
B) menstrual phase → ovulation → secretory phase → proliferative phase → menstrual phase 
C) menstrual phase → secretory phase → proliferative phase → ovulation → menstrual phase 
D) menstrual phase → proliferative phase → secretory phase → ovulation → menstrual phase 
A) menstrual phase → proliferative phase → ovulation → secretory phase → menstrual phase 
B) menstrual phase → ovulation → secretory phase → proliferative phase → menstrual phase 
C) menstrual phase → secretory phase → proliferative phase → ovulation → menstrual phase 
D) menstrual phase → proliferative phase → secretory phase → ovulation → menstrual phase

Question 8

What describes marsupial embryos?

Accepted Answer

A) They are born fully developed. 
B) They are born highly underdeveloped. 
C) They hatch from an internal egg. 
D) They hatch from an externally laid egg. 
E) They are nourished by the placenta. 
A) They are born fully developed. 
B) They are born highly underdeveloped. 
C) They hatch from an internal egg. 
D) They hatch from an externally laid egg. 
E) They are nourished by the placenta.

Question 9

What stimulates growth of ovarian follicles?

Accepted Answer

A) Estradiol 
B) FSH 
C) LH 
D) Progesterone 
E) Testosterone 
A) Estradiol 
B) FSH 
C) LH 
D) Progesterone 
E) Testosterone

Question 10

An adult male produces sperm continuously by meiotic division of cells lining what structure?

Accepted Answer

A) Malpighian tubules 
B) Fallopian tubules 
C) seminiferous tubules 
D) epididymis tubules 
E) vas deferens tubules 
A) Malpighian tubules 
B) Fallopian tubules 
C) seminiferous tubules 
D) epididymis tubules 
E) vas deferens tubules

Question 11

What special feature of the ovum is facilitated by the production of polar bodies?

Accepted Answer

A) large size of the cell 
B) extra layers of plasma membrane 
C) triploidy 
D) large size of the nucleus 
A) large size of the cell 
B) extra layers of plasma membrane 
C) triploidy 
D) large size of the nucleus

Question 12

What would be the result for a patient if all his spermatogonia went through meiosis and proceeded to develop into spermatids?

Accepted Answer

A) He would produce twice as many sperm and would be protected against infertility from other causes. 
B) He would produce twice as many sperm,which would crowd them during later development and lead to morphological defects. 
C) He would be entirely normal,since this is what usually happens. 
D) After one round of sperm production he would no longer be able to produce sperm and would be infertile. 
A) He would produce twice as many sperm and would be protected against infertility from other causes. 
B) He would produce twice as many sperm,which would crowd them during later development and lead to morphological defects. 
C) He would be entirely normal,since this is what usually happens. 
D) After one round of sperm production he would no longer be able to produce sperm and would be infertile.

Question 13

Which is a correct statement about reptile reproduction compared to bird reproduction?

Accepted Answer

A) Birds are oviparous,reptiles are ovoviviparous. 
B) Both newly hatched birds and reptiles require parental care. 
C) Both exhibit external fertilization. 
D) The eggs of both birds and reptiles have protective shells. 
E) Male or female reptiles reproduce asexually; birds do not. 
A) Birds are oviparous,reptiles are ovoviviparous. 
B) Both newly hatched birds and reptiles require parental care. 
C) Both exhibit external fertilization. 
D) The eggs of both birds and reptiles have protective shells. 
E) Male or female reptiles reproduce asexually; birds do not.

Question 14

The immotile sperm develop motility in about 18 hours after arriving at the long,coiled tube called the

Accepted Answer

A) vas deferens 
B) seminiferous tubules 
C) epididymis 
D) testis 
A) vas deferens 
B) seminiferous tubules 
C) epididymis 
D) testis

Question 15

Choose the letter of the best match from the following:
-If a mutant organism used mitosis to produce gametes,what would be the result of mating with a wildtype partner?

Accepted Answer

A) Progeny would be quadraploid,and almost certainly nonviable. 
B) Progeny would be triploid,and almost certainly nonviable. 
C) Progeny would be normal -- this is a common occurrence in some phyla. 
D) The resulting progeny would be identical twins. 
A) Progeny would be quadraploid,and almost certainly nonviable. 
B) Progeny would be triploid,and almost certainly nonviable. 
C) Progeny would be normal -- this is a common occurrence in some phyla. 
D) The resulting progeny would be identical twins.

Question 16

Which of the following determines genetic sex (male or female)in mammals?

Accepted Answer

A) the Y chromosome contained in the egg 
B) the SRY gene on the Y chromosome 
C) the temperature of the developing fetus 
D) the genetic makeup of the parents 
E) the acrosome of the sperm 
A) the Y chromosome contained in the egg 
B) the SRY gene on the Y chromosome 
C) the temperature of the developing fetus 
D) the genetic makeup of the parents 
E) the acrosome of the sperm

Question 17

The uterine lining proliferates during the female cycle and then sloughs off in what process?

Accepted Answer

A) implantation 
B) fertilization 
C) menstruation 
D) ovulation 
E) placentation 
A) implantation 
B) fertilization 
C) menstruation 
D) ovulation 
E) placentation

Question 18

What process is absent in mammals with an estrous cycle?

Accepted Answer

A) oogenesis 
B) homeostasis 
C) ovulation 
D) menstruation 
E) placenta formation 
A) oogenesis 
B) homeostasis 
C) ovulation 
D) menstruation 
E) placenta formation

Question 19

In females at puberty,what cells begin to secrete the major female sex hormone estradiol?

Accepted Answer

A) oocyte cells 
B) corpus luteum 
C) follicle cells 
D) granulosa cells 
A) oocyte cells 
B) corpus luteum 
C) follicle cells 
D) granulosa cells

Question 20

Terrestrial vertebrates and some fish evolved a form of fertilization in which the male gametes are introduced into the female reproductive tract.What is this called?

Accepted Answer

A) synchronous fertilization 
B) external fertilization 
C) internal fertilization 
D) asexual fertilization 
A) synchronous fertilization 
B) external fertilization 
C) internal fertilization 
D) asexual fertilization

Exam 51: The Reproductive System

What stimulates secretion of testosterone by Leydig cells?

Why did internal fertilization likely evolve?

At a party,one of your friends has just revealed that he and his wife are trying to conceive.What do you advise him to avoid at the party?

In males,sterilization involves a vasectomy,which removes a portion of what structure?

A 38-year-old woman is going to ovulate in about a week.For how long has the primary oocyte in her Graafian follicle been arrested at prophase I of meiosis?

The scrotum is a sac-like structure outside the abdomen in which the testes are suspended.Why is this structure essential?

Select the correct sequence of events of the human menstrual phase,beginning and ending with the menstrual cycle.

What describes marsupial embryos?

What stimulates growth of ovarian follicles?

An adult male produces sperm continuously by meiotic division of cells lining what structure?

What special feature of the ovum is facilitated by the production of polar bodies?

What would be the result for a patient if all his spermatogonia went through meiosis and proceeded to develop into spermatids?

Which is a correct statement about reptile reproduction compared to bird reproduction?

The immotile sperm develop motility in about 18 hours after arriving at the long,coiled tube called the

Choose the letter of the best match from the following: -If a mutant organism used mitosis to produce gametes,what would be the result of mating with a wildtype partner?

Which of the following determines genetic sex (male or female)in mammals?

The uterine lining proliferates during the female cycle and then sloughs off in what process?

What process is absent in mammals with an estrous cycle?

In females at puberty,what cells begin to secrete the major female sex hormone estradiol?

Terrestrial vertebrates and some fish evolved a form of fertilization in which the male gametes are introduced into the female reproductive tract.What is this called?

The Science of Biology

The Nature of Molecules and the Properties of Water

The Chemical Building Blocks of Life

Cell Structure

Membranes

Energy and Metabolism

How Cells Harvest Energy

Photosynthesis

Cell Communication

How Cells Divide

Sexual Reproduction and Meiosis

Patterns of Inheritance

Chromosomes, mapping, and the Meiosisinheritance Connection

Dna: the Genetic Material

Genes and How They Work

Control of Gene Expression

Biotechnology

Genomics

Cellular Mechanisms of Development

Genes Within Populations

The Evidence for Evolution

The Origin of Species

Systematics,phylogenies,and Comparative Biology

Genome Evolution

The Origin and Diversity of Life

Viruses

Prokaryotes

Protists

Seedless Plants

Seed Plants

Fungi

Animal Diversity and the Evolution of Body Plans

Protostomes

Deuterostomes

Plant Form

Transport in Plants

Plant Nutrition and Soils

Plant Defense Responses

Sensory Systems in Plants

Plant Reproduction

The Animal Body and Principles of Regulation

The Nervous System

Sensory Systems

The Endocrine System

The Musculoskeletal System

The Digestive System

The Respiratory System

The Circulatory System

Osmotic Regulation and the Urinary System

The Immune System

Animal Development

Behavioral Biology

Ecology of Individuals and Populations

Community Ecology

Dynamics of Ecosystems

The Biosphere and Human Impacts

Conservation Biology

Filters