FREE BIOLOGY AND STUDY GAMES ABOUT BIO CHAPTER

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FREE BIOLOGY AND STUDY GAMES ABOUT BIO CHAPTER

35 EXAM QUESTIONS

Qs and Ans Expert- Explanation

This Exam contains:

-Guarantee passing score -44 Questions and Answers -format set of multiple-choice -Expert- Explanation Question 1: During spermatogenesis, which of the following is the first haploid cell?

Answer:

Secondary Spermatocyte

Question 2: What is the Fetal stage?

Answer:

stage when organ systems continue to develop and become functional Question 3: Outpouching of the yolk sac; gives rise to the blood cells in the umbilical cord

Answer:

Allantois Question 4: For fertilization to occur, the sperm must pass through ______ cells that surround the ovum.

Answer:

Follicle

Question 5: By the 3rd month, what is noticed?

Answer:

Bone is forming

Question 6: Select all of the following effects of testosterone in adult males.

Answer:

-sustain the libido -stimulate sperm production -control activity of the prostate gland Question 7: About 7 days after fertilization, the ______ has formed and consists of an inner cell mass and fluid surrounded by a layer called the trophoblast.

Answer:

Blastocyst Question 8: In a positive feedback cycle, the hormone ______ stimulates contraction of uterine muscles during childbirth.

Answer:

Oxytocin Question 9: At about 3 weeks, the ______ forms along the back of the embryonic disc and becomes a longitudinal axis around which structures organize as they develop.

Answer:

Primitive streak Question 10: Connects baby to mom's circulation, will eventually be replaced by the placenta

Answer:

Chorion Question 11: The extraembryonic membrane called the ______ contains fluid that cushions the embryo and maintains a constant temperature.

Answer:

Amnion

Question 12: In females, progesterone and estrogen are secreted by the ______ in response to stimulation by FSH and LH secreted by the ______.

Answer:

ovaries; anterior pituitary Question 13: Put the structures into the order that they arise during embryonic development, beginning at the top with the first structure.

Answer:

• embryonic disk

• Primitive streak

• neural groove

• neural tube

Question 14: During ovulation, a ______ is released from its follicle and is swept into the

______.

Answer:

secondary oocyte, uterine tube Question 15: After ovulation in animals, the ruptured follicle differentiates into a gland called the

Answer:

corpus luteum.Question 16: An embryonic layer called the ______ forms the inner layer of the gastrula.

Answer:

Endoderm Question 17: High levels of estrogen exert ______ on the secretion of hormones from the hypothalamus and anterior pituitary.

Answer:

Negative Feedback

Question 18: ______ feedback induces hormonal changes to cause childbirth to initiate and continue.

Answer:

Positive Question 19: The location of the testes outside the body within the scrotum allows?

Answer:

a slightly cooler temperature for sperm to develop.Question 20: On average out of 100 sexually active, fertile women, how many will become pregnant each year if no birth control is used?

Answer:

85 Question 21: Select all the types of signals that can stimulate cell development and differentiation during animal development.

Answer:

-Hormones -Protein Gradient -Homoetic genes Question 22: The amnion helps maintain a regulated temperature and ______ that protects the developing embryo.

Answer:

Pressure Question 23: In a process called ______, the trophoblast sends out projections and secretes enzymes to embed the blastocyst into the uterine lining.

Answer:

Implantation Question 24: By the end of the __ th week (2nd month), all organ systems are in place

Answer:

8