Question 1

Which of the following best explains why long-term antibiotic use can negatively impact human health?

Accepted Answer

Antibiotics can eliminate beneficial gut bacteria, disrupting the microbiome and leading to health problems.

Question 2

DNA is often compared to language in biology. Which aspect of this analogy is most accurate?

Accepted Answer

Both DNA and language use a linear sequence of basic units, where the order determines meaning or function.

Question 3

A human karyotype shows 46 chromosomes. Which of the following statements is correct regarding their origin?

Accepted Answer

There are 23 pairs, with one chromosome of each pair inherited from each parent.

Question 4

The SRY gene plays a crucial role in human development. Where is it located and what is its function?

Accepted Answer

It is located on the Y chromosome and initiates male sex determination.

Question 5

Which of the following best describes the consequences of reduced genetic diversity in a population?

Accepted Answer

It increases the prevalence of recessive genetic disorders due to a higher chance of inheriting two copies of harmful alleles.

Question 6

Why was the NIH Revitalization Act of 1993 significant for clinical research in the United States?

Accepted Answer

It required the inclusion of women and minorities in all NIH-funded clinical research, improving representation.

Question 7

During which phase of the cell cycle is DNA replicated?

Accepted Answer

S phase of interphase

Question 8

A scientist observes chromosomes in their familiar X-shaped form under a microscope. What is true about the state of the cell?

Accepted Answer

The cell is undergoing division, and each X-shaped chromosome consists of two sister chromatids joined at the centromere.

Question 9

Which checkpoint failure is most directly associated with the development of cancer?

Accepted Answer

Failure to monitor DNA integrity, allowing cells with damaged DNA to divide uncontrollably.

Question 10

Which of the following correctly distinguishes mitosis from meiosis?

Accepted Answer

Mitosis produces two genetically identical cells with the same chromosome number as the parent, while meiosis produces four genetically unique cells with half the chromosome number.

Question 11

A forensic scientist is using mitochondrial DNA to identify a child separated from their family. Why is mitochondrial DNA particularly useful in this context?

Accepted Answer

Mitochondrial DNA is inherited only from the mother, allowing maternal lineage to be traced.

Question 12

Which of the following best explains why the ovule (egg cell) is much larger than the sperm cell?

Accepted Answer

The ovule contains not only DNA but also cellular machinery and nutrients necessary for early development.

Question 13

A population practicing endogamy (marriage within a small group) is likely to experience which genetic consequence over generations?

Accepted Answer

Increased frequency of recessive genetic disorders due to reduced genetic diversity.

Question 14

During which stage of mitosis do chromosomes align at the center of the cell?

Accepted Answer

Metaphase

Question 15

If a cell fails to properly separate sister chromatids during anaphase, what is the most likely result?

Accepted Answer

Daughter cells with abnormal numbers of chromosomes (aneuploidy).

Question 16

Which of the following equations correctly represents the chromosome number in human gametes after meiosis?

Accepted Answer

$$n = 23$$

Question 17

A researcher is studying a population with high rates of a recessive genetic disorder. Which population genetic factor is most likely responsible?

Accepted Answer

Low genetic diversity due to inbreeding or endogamy.

Question 18

Which of the following best describes the structure of a duplicated chromosome during mitosis?

Accepted Answer

Two sister chromatids joined at the centromere.

Question 19

Which of the following is a real-world example of how mitochondrial DNA has been used in genetic studies?

Accepted Answer

Identifying children separated from families during Argentina’s history.

Cell Types, Chromosomes, and Genetic Variation: Study Notes for General Biology

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