2021 Human Embryology(Shandong University) 最新满分章节测试答案

文章目录[隐藏]

Week 2 Gametogenesis and fertilization Test of week 2
Week 3 First week and second week of development： Cleavage to implantation Test for week 3
Week 4 Third to eight week of development： Gastrulation and differentiation of trilaminar disc Test
Week 5 Fetal membrane and placenta Test for week 5
Week 6 Development of the head and neck Test for week 6
Week 7 Development of the digestive and respiratory system Test for week 7
Week 8 Development of urogenital system Test for week 8
Week 9 Development of cardiovascular system Test for week 9

本答案对应课程为:点我自动跳转查看
本课程起止时间为:2021-03-18到2021-07-18
本篇答案更新状态:已完结

Week 2 Gametogenesis and fertilization Test of week 2

1、问题:Which of the following is a major characteristic of meiosis I?
选项：
A:Reducing the amount of DNA to IN
B:Achieving the diploid number of chromosomes
C:Pairing of homologous chromosomes
D:Producing primordial germ cells
答案: 【Pairing of homologous chromosomes】

2、问题:A normal somatic cell contains a total of 46 chromosomes.What is the normal complement of chromosomes found in a sperm?
选项：
A:22 autosomes plus a sex chromosome
B:23 paired autosomes
C:23 autosomes plus a sex chromosome
D:22 autosomes
答案: 【22 autosomes plus a sex chromosome】

3、问题:Which of the following describes the number of chromosomes and amount of DNA in a gamete?
选项：
A:23 chromosomes,2N
B:23 chromosomes,4N
C:46 chromosomes,1N
D:23 chromosomes,1N
答案: 【23 chromosomes,1N】

4、问题:Which of the following chromosome compositions in a sperm normally results in the production of a genetic female if fertilization occurs?
选项：
A:23 autosomes plus an X chromosome
B: 22 autosomes plus a Y chromosome
C:22 autosomes plus an X chromosome
D:23 homologous pairs of chromosomes
答案: 【22 autosomes plus an X chromosome】

5、问题:In the process of meiosis,DNA replication of each chromosome occurs,form ing a structure consisting of two sister chromatids attached to a single centromere.What is this structure?
选项：
A:A crossover chromosome
B:A duplicated chromosome
C:Two chromosomes
D:A homologous pair
答案: 【A duplicated chromosome】

6、问题:All primary oocytes are formed by
选项：
A:month 5 of fetal life
B:month 5 of infancy
C:week 4 of embryonic life
D:puberty
答案: 【month 5 of fetal life】

7、问题:When does formation of primary spermatocytes begin?
选项：
A:During week 4 of embryonic life
B:At birth
C:During month 5 of infancy
D: At puberty
答案: 【 At puberty】

8、问题:In the production of female gametes,which of the following cells can remain dormant for 12 to 40 years?
选项：
A:Primordial germ cell
B:Second polar body
C:Primary oocyte
D:First polar body
答案: 【Primary oocyte】

9、问题:In the production of male gametes, which of the following cells remains dormant for 12 years?
选项：
A:Primordial germ cell
B:Secondary spermatocyte
C:Spermatid
D:Primary spermatocyte
答案: 【Primordial germ cell】

10、问题:Approximately how many sperm will be ejaculated by a normal fertile male during sexual intercourse?
选项：
A:10 million
B:350 million
C:35 million
D:100 million
答案: 【350 million】

11、问题:A young woman enters puberty with approximately 40,000 primary oocytes in her ovary.About how many of these primary oocytes will be ovulated over the entire reproductive life of the woman?
选项：
A:35,000
B:48
C:40,000
D:480
答案: 【480】

12、问题:How much DNA does a primary spermatocyte contain?
选项：
A:4N
B:IN
C:6N
D:2N
答案: 【4N】

13、问题:During ovulation,the secondary oocyte resides at what specific stage of meiosis?
选项：
A:Meiosis is completed at the time of ovulation
B:Metaphase of meiosis I
C:Metaphase of meiosis II
D:Prophase of meiosis I
答案: 【Metaphase of meiosis II】

14、问题:Concerning maturation of the female gamete(oogenesis),when do the oogonia enter meiosis I and undergo DNA replication to form primary oocytes?
选项：
A:Following fertilization
B:With each ovarian cycle
C:At puberty
D:During fetal life
答案: 【During fetal life】

15、问题:Where do primordial germ cells initially develop?
选项：
A:In the yolk sac at week 4 of embryonic development
B:In the gonads at week 4 of embryonic development
C:In the gonads at puberty
D:In the gonads at month 5 of embryonic development
答案: 【In the yolk sac at week 4 of embryonic development】

Week 3 First week and second week of development： Cleavage to implantation Test for week 3

1、问题:A 20-year-old woman presents at the emergency department with severe abdominal pain on the right side with signs of internal bleeding. She indicated that she has been sexually active without contraception and missed her last menstrual period. Based on this information, which of the following disorders must be included as an option in the diagnosis?
选项：
A:Ovarian cancer
B: Normal pregnancy
C:Ectopic tubal pregnancy
D:Appendicitis
答案: 【Ectopic tubal pregnancy】

2、问题:When does a secondary oocyte complete its second meiotic division to become a mature ovum?
选项：
A:Before ovulation
B:At fertilization
C:Before birth
D:At ovulation
答案: 【At fertilization】

3、问题:How soon after fertilization occurs within the uterine tube does the blastocyst begin implantation?
选项：
A:By day 7
B:By day 2
C:By day 1
D:Within minutes
答案: 【By day 7】

4、问题:Where does the blastocyst normally implant?
选项：
A:Basal layer of the endometrium
B:Functional layer of the cervix
C:Functional layer of the endometrium
D:Myometrium
答案: 【Functional layer of the endometrium】

5、问题:Which of the following events is involved in the cleavage of the zygote during week 1 of development?
选项：
A:An increased cytoplasmic content of blastomeres
B:A decrease in size of blastomeres
C: A series of mciotic divisions forming blastomeres
D:An increase in size of blastomeres
答案: 【A decrease in size of blastomeres】

6、问题:Which of the following structures must degenerate for blastocyst implantation to occur?
选项：
A:Zona pellucida
B:Endometrium in progestational phase
C:Functional layer of the endometrium
D:Syncytiotrophoblast
答案: 【Zona pellucida】

7、问题:Which of the following is the origin of the mitochondrial DNA of all human adult cells?
选项：
A:A combination of paternal and maternal
B:Either paternal or maternal
C:Maternal only
D:Paternal only
答案: 【Maternal only】

8、问题:Individual blastomeres were isolated from a blastula at the 4-cell stage. Each blastomere was cultured in vitro to the blastocyst stage and individually implanted into four pseudopregnant foster mothers. Which of the following would you expect to observe 9 months later?
选项：
A:Birth of four genetically identical babies
B:Birth of four genetically different babies