MEDICINE COLLEGE

The source of all germ cells in the developing embryo is the: a. yolk sac
b. allantois
c. cytotrophoblast
d. yolk stalk
e. chorion

Answers

Answer 1
Answer:

Answer:

The correct answer is option A. yolk sac.

Explanation:

Germ cells are cells that have the ability to form or develop gametes. It has half the number of chromosomes. Primordial germ cells present in an embryo are the cells, that in adults produce reproductive gametes.

After 3 weeks of fertilization germ cells are first time become recognizable in humans, in the endodermal layer (which is an inner layer of germ layer) of yolk sac by their huge size and high content of the enzyme alkaline phosphatase.

Thus, the correct answer is option A. yolk sac.


Related Questions

COLLEGE

Which of the following disorders results from a deficiency of factor VIII? a. Sickle cell disease
b. Christmas disease
c. Hemophilia A
d. Hemophilia B

Answers

Answer:

(c). Hemophilia A

Explanation:

Hemophilia A can be defined as a genetic disorder, characterized by severe external or internal bleeding. Hemophilia A is caused by defective or missing factor VIII, due to mutation in gene for factor VIII that leads to formation of a non-function or truncated clotting protein.

Factor VIII is a blood clotting protein, which prevents excessive blood loss during injury. Hence, deficiency of factor VIII can leads to development of hemophilia A.

Thus, the correct answer is  option (c).

COLLEGE

Ogden, a child psychologist, has an empiricist approach toward perceptual development. Ogden would agree with which of the following statements? The ability of perception in infants is not innate but develops with learning and experience. Infants’ ability to perceive the world is inborn and is influenced by their genes. Infants’ ability to perceive is present at birth and involves the development of distinctive features that are detected at later ages. Infants’ ability to perceive is present at birth and develops with the cognitive development in infants.

Answers

Answer:

The best answer to the question: Ogden would agree with which of the following statements?, would be: The ability of perception in infants is not innate but develops with learning and experience.

Explanation:

The reason for this being the correct question comes from the approach that Ogden, the psychologist, has adopted to explain how children´s perception develops. Empiricism is a theory that focuses on the role that contact between the individual and his/her environment has on the development of perception and proper behavioral responses. As such, this theory stresses the importance of learning and experience, and not from what is inscribed in the genetic material of a child. This is precisely what Ogden seems to believe, as he has an empiricist approach. This is why the answer to the question is the first option.

MIDDLE SCHOOL

4. X+5y=45
2x+2y=45
How do I solve this

Answers

Answer:

-2x+3y=45

Explanation:

I'm not sure exactlly what you are asking but I thing you have to set them equal to each other so X+5Y=2x+2y and then combine the like terms by subtracting the x to the other side, so it'll be -2x+3y=45 I believe

COLLEGE

When was the first anesthesiology assistant graduate education program established in the US?

Answers

Answer:

The AA profession came into being in the 1960s, when we had a serious shortage of anesthesia professionals in the U.S.

Explanation:

The goal was to create a new master’s level program that would enable graduates to deliver anesthesia care under the direction of a physician anesthesiologist.  The first AA programs were established at Emory University in Atlanta and Case Western Reserve University in Cleveland.

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