Q: If a cell divides every 12 hours starting from a single cell, how many cells will be present after 48 hours? Use the formula $$N = N_0$ \times 2$$^{n}$$, where N_0$ is the initial number of cells and n$ is the number of divisions.

$$N = 1 \times 2$$^{4}$$ = 16$$

Question 1

Which of the following best describes the embryonic period of prenatal development?

Accepted Answer

It lasts from 2 to 8 weeks after conception and is characterized by organogenesis.

Question 2

A pregnant woman undergoes a test where a sample is taken from the chorionic villi. What is the primary purpose of this test?

Accepted Answer

To screen for genetic and chromosomal abnormalities.

Question 3

During which prenatal period does implantation occur?

Accepted Answer

Germinal period

Question 4

Which diagnostic test is considered noninvasive and analyzes fetal DNA in maternal blood?

Accepted Answer

Noninvasive Prenatal Diagnosis (NIPD)

Question 5

A fetus is exposed to a teratogen during organogenesis. Which period is most likely affected?

Accepted Answer

Embryonic period

Question 6

Which of the following equations best represents the total duration of human prenatal development in weeks?

Accepted Answer

$$38 \leq x \leq 40$$

Question 7

A physician suspects a neural tube defect in a fetus. Which prenatal diagnostic test is most appropriate for confirming this suspicion?

Accepted Answer

Ultrasound Sonography

Question 8

Which structure is responsible for nutrient and gas exchange between mother and fetus?

Accepted Answer

Placenta

Question 9

If a cell divides every 12 hours starting from a single cell, how many cells will be present after 48 hours? Use the formula $$N = N_0$ 	imes 2$$^{n}$$, where N_0$ is the initial number of cells and n$ is the number of divisions.

Accepted Answer

$$N = 1 	imes 2$$^{4}$$ = 16$$

Question 10

Which of the following is NOT a function of the placenta?

Accepted Answer

Protection against all infections

Question 11

A woman is 10 weeks pregnant. Which period of prenatal development is she currently in?

Accepted Answer

Fetal period

Question 12

Which of the following best explains why amniocentesis is typically performed after 15 weeks of gestation?

Accepted Answer

There is sufficient amniotic fluid for safe sampling.

Question 13

Which prenatal diagnostic test uses magnetic fields and radio waves to produce detailed images of the fetus?

Accepted Answer

Fetal MRI

Question 14

If a teratogen exposure occurs during the germinal period, what is the most likely outcome?

Accepted Answer

Spontaneous abortion or failure of implantation

Question 15

Which of the following statements about chorionic villus sampling (CVS) is correct?

Accepted Answer

CVS can be performed earlier in pregnancy than amniocentesis.

Question 16

Which vessel carries oxygenated blood from the placenta to the fetus?

Accepted Answer

Umbilical vein

Question 17

A researcher wants to study the process of organ formation in a developing embryo. Which period should they focus on?

Accepted Answer

Embryonic period

Question 18

Which of the following is a risk associated with invasive prenatal diagnostic tests such as amniocentesis and CVS?

Accepted Answer

Increased risk of miscarriage

Question 19

Which of the following best describes the role of the chorion in prenatal development?

Accepted Answer

It forms part of the placenta and contributes to nutrient exchange.

Question 20

A fetus is found to have a genetic disorder after maternal blood screening. Which principle allows fetal DNA to be detected in maternal blood?

Accepted Answer

Fetal DNA crosses the placenta into maternal circulation.

Module 2: Human Beginnings and Infancy – Prenatal Development, Birth, and Early Growth

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