Question 1

Which of the following best describes the role of DNA ligase during the construction of a recombinant DNA vector?

Accepted Answer

It joins together fragments of DNA by forming phosphodiester bonds between nucleotides.

Question 2

A scientist wants to insert a human gene into a bacterial plasmid. Which combination of enzymes and DNA features is essential for this process?

Accepted Answer

Restriction enzymes to cut DNA and DNA ligase to join fragments with compatible sticky ends.

Question 3

Which of the following statements about plasmids is correct?

Accepted Answer

Plasmids are circular DNA molecules that can replicate independently of the bacterial chromosome.

Question 4

Why are 'sticky ends' produced by restriction enzymes important in genetic engineering?

Accepted Answer

They allow DNA fragments from different sources to be joined together more easily due to complementary base pairing.

Question 5

During gel electrophoresis, why do smaller DNA fragments move farther through the gel than larger fragments?

Accepted Answer

Smaller fragments experience less resistance as they migrate through the gel matrix.

Question 6

Which of the following best explains why DNA moves toward the positive electrode during gel electrophoresis?

Accepted Answer

DNA is negatively charged due to its phosphate backbone.

Question 7

How did the development of CRISPR-Cas9 improve upon traditional restriction enzyme-based genetic engineering?

Accepted Answer

CRISPR-Cas9 allows for precise, targeted editing of specific DNA sequences, whereas restriction enzymes cut at fixed recognition sites.

Question 8

Which of the following best distinguishes DNA cloning from organismal cloning?

Accepted Answer

DNA cloning produces multiple copies of a gene or DNA fragment, while organismal cloning produces a genetically identical organism.

Question 9

Why is understanding epigenetic tags important in the context of animal cloning?

Accepted Answer

Epigenetic tags can affect gene expression, leading to differences in cloned animals even if their DNA sequences are identical.

Question 10

Which of the following statements about stem cells is correct?

Accepted Answer

Embryonic stem cells can differentiate into any cell type, while adult stem cells are usually limited to specific tissues.

Question 11

A patient with a damaged spinal cord is being considered for stem cell therapy. Which property of stem cells makes this therapy possible?

Accepted Answer

Stem cells can differentiate into specialized cell types needed for tissue repair.

Question 12

Which of the following best defines genomics?

Accepted Answer

The study of entire genomes, including all of an organism's genes and their interactions.

Question 13

What was the primary goal of the Human Genome Project?

Accepted Answer

To determine the complete sequence of human DNA and identify all human genes.

Question 14

Which statement about the number of genes in complex organisms is supported by genomics research?

Accepted Answer

More complex organisms do not necessarily have more genes than simpler organisms.

Question 15

Only about 2.5% of the human genome codes for proteins. Why is the presence of large amounts of non-coding DNA significant?

Accepted Answer

Non-coding DNA can regulate gene expression and may contain elements important for genome structure and function.

Question 16

Which of the following is an example of a genetically modified (GM) crop and a potential advantage it provides?

Accepted Answer

Bt corn, which produces a protein toxic to certain insect pests, reducing the need for chemical pesticides.

Question 17

Which of the following is a potential disadvantage of GM crops?

Accepted Answer

They may lead to the development of resistant pests or unintended effects on non-target organisms.

Question 18

A researcher is using PCR (polymerase chain reaction) to amplify a DNA fragment. Which of the following best describes the outcome of this process?

Accepted Answer

The DNA fragment is copied exponentially, producing millions of identical copies.

Question 19

Which of the following best describes a pseudogene?

Accepted Answer

A DNA sequence that resembles a gene but is nonfunctional due to mutations.

Question 20

A forensic scientist analyzes a DNA sample using gel electrophoresis. The sample produces several bands of different sizes. What does each band represent?

Accepted Answer

A DNA fragment of a specific length separated from other fragments.

Biotechnology and Genomics Study Guide – Step-by-Step Guidance

Study Guide - Practice Questions

Study Guide - Flashcards