Bio Final

examples of diseases that would be best treated using the same type of human gene therapy used to treat ADA deficiency- cystic fibrosis

The only item that is not needed when using the CRISPR-Cas system to introduce a specific point mutation into a gene is the Cas1 gene. Here's why:

sgRNA (single-guide RNA): This is essential as it guides the Cas9 enzyme to the specific location in the genome where the mutation needs to be introduced.
Donor DNA: This is required if you want to introduce a specific point mutation. The donor DNA serves as a template for the desired mutation and is used by the cell's repair machinery during the DNA repair process.
Cas9 gene: This is necessary as Cas9 is the enzyme that creates a double-stranded break at the target site in the DNA, which then allows for the introduction of the desired mutation through the repair process.

Cas1, on the other hand, is not directly involved in the process of introducing specific point mutations using CRISPR-Cas. Cas1 is typically associated with the adaptation stage of CRISPR-Cas systems in bacteria, where it helps incorporate new spacer sequences into the CRISPR array. However, for introducing point mutations in a gene, Cas1 is not needed.

what os the first line of defense that a bacterial cell might have against infection by T2 phage?- it might be able to prevent attachment of the phage to its cell wall

PCR requires: DNA template, Primers, DNA polymerase, Nucleotides, Buffer solution

Thermal cyclerPCR amplifies DNA segments through repeated cycles of denaturation, annealing, and extension.

Law of Independent Assortment: States that alleles of different genes segregate independently of one another during gamete formation. This principle is one of the basic laws of genetics proposed by Gregor Mendel.

DNA Methylation: Methylation involves the addition of a methyl group to DNA, often at specific sites like CpG islands. This modification can regulate gene expression by influencing how tightly DNA is packed around histone proteins. Certain nutrients in the diet, such as folate, choline, and other methyl donors, can affect DNA methylation patterns.

Genomic imprinting is an epigenetic phenomenon where gene expression is dependent on the parent of origin. It results in different expression patterns based on whether the allele is inherited from the mother or father.

For example, some transcription factors may act as master regulators that initiate developmental programs early on and continue to play roles in later stages by interacting with other factors or by modulating downstream targets. Additionally, changes in the activity or expression of transcription factors during one phase of development can have cascading effects on gene regulatory networks that impact subsequent phases of development.

A cell is considered to be determined when it is committed to becoming a particular cell type, such as an intestinal cell or muscle cell. Determination typically involves the activation of specific gene expression programs that drive the cell towards a specific fate, although it may not yet exhibit all the morphological or functional characteristics of the final cell type.

Once a cell has undergone significant changes in morphology and function, usually permanently, to become a highly specialized cell type, it is considered to be differentiated. Differentiation involves the expression of genes specific to the cell type, leading to the acquisition of specialized structures and functions characteristic of that cell type.

Pleiotropy- the phenomenon in which a single gene affects several traits, seems unrealed in the phenotype of an organism

Mendelas law of segregation states that- two alleles for a character segregate during formation of gametes so that each gamete carries only one allele for each character

Gregor Mendel- discovered the basic principles of hereditary, carried out his experiments in a monastery garden, conducted research that proved the “blending hypothesis” was the correct explanation of how heredity worked, carried out his experiments on heredity by doing thousands of genetic crosses ona common garden plant

Aneuploidy refers to a condition in which an individual has an abnormal number of chromosomes, either too many (trisomy) or too few (monosomy), compared to the typical diploid number for that species.

For example:

Trisomy: When an individual has three copies of a particular chromosome instead of the usual two, such as Trisomy 21 (Down syndrome), which involves an extra copy of chromosome 21.
Monosomy: When an individual has only one copy of a particular chromosome instead of the usual two, such as Turner syndrome, which involves a missing X chromosome in females.
Reduction division, also known as meiosis, is a type of cell division that produces gametes with half the number of chromosomes as the parent cell. It involves two rounds of division resulting in four daughter cells, each with half the number of chromosomes.

During interphase cells grow and replicate

ampicillin treats bacterial infections

Transgenic refers to an organism or cell whose genome has been altered by the introduction of one or more foreign DNA sequences from another species by artificial means

Which of the following is not a mechanism by which viruses could cause cancer?

DNA of the virus could insert into the coding region of a tumor-suppressor gene, inactivating it. A protein made by the virus could activate a cell division pathway. Infection by a virus could cause the immune system to kill the infected cells by apoptosis. A virus could insert DNA in a promoter of a proto-oncogene, causing the resulting oncogene to become overexpressed.

Which of the following is a long non-coding RNA molecule known to be involved in gene regulation? A) miRNA B) siRNA C) HOTAIR D) RISC
Which RNA molecule is responsible for guiding the RNA-induced silencing complex (RISC) to its target mRNA for degradation or translational repression? A) HOTAIR B) miRNA C) siRNA D) SRP
The function of the signal recognition particle (SRP) is to: A) Guide ribosomes to the endoplasmic reticulum for protein synthesis B) Assist in the processing of pre-mRNA into mature mRNA C) Facilitate the transport of tRNA molecules during translation D) Target proteins to the appropriate subcellular compartments
Which of the following RNA molecules is involved in post-transcriptional gene silencing through cleavage or translational repression of target mRNAs? A) HOTAIR B) miRNA C) siRNA D) RISC
The RNA-induced silencing complex (RISC) functions by: A) Binding to specific DNA sequences to activate gene expression B) Degrading mature mRNA molecules in the cytoplasm C) Recognizing and cleaving target mRNA guided by small RNA molecules D) Facilitating the export of mRNA from the nucleus to the cytoplasm

Which of the following is a key component of the transcriptional machinery in eukaryotic cells that recognizes specific DNA sequences and recruits RNA polymerase to initiate transcription? A) Ribosomal RNA B) Transfer RNA C) General Transcription Factors (GTFs) D) Small nuclear RNA

RNA processing in eukaryotic cells involves which of the following processes? A) Translation of mRNA into protein B) Addition of a 5' cap and poly-A tail to pre-mRNA C) Removal of exons and retention of introns in mature mRNA D) Export of mature mRNA from the nucleus to the cytoplasm
During translation in eukaryotic cells, the ribosome binds to the mRNA at which specific sequence to initiate protein synthesis? A) Start codon B) Stop codon C) Splice site D) Poly-A tail
Which of the following is a common post-translational modification that can alter the activity, stability, or localization of a protein in eukaryotic cells? A) Alternative splicing B) mRNA degradation C) Phosphorylation D) DNA methylation

DNA methylation primarily involves the addition of a methyl group to which nucleotide base in the DNA molecule? A) Adenine B) Thymine C) Cytosine D) Guanine
In eukaryotic genomes, regions with reduced nucleosome occupancy that facilitate access to transcription factors are known as: A) Histone tails B) DNA methylation sites C) Nucleosome cores D) Nucleosome-free regions (NFRs)
Alternative splicing of mRNA allows for the generation of multiple protein isoforms from a single gene by: A) Selectively removing exons and retaining introns B) Retaining all exons and introns in the mature mRNA C) Splicing together exons in different combinations D) Preventing mRNA export from the nucleus

Which DNA sequence element is typically located upstream of the transcription start site and recognized by the TATA-binding protein? A) Transcriptional start site B) Regulatory element C) Enhancer sequence D) TATA box
The point at which transcription begins and indicates the first nucleotide to be transcribed into RNA is known as the: A) Promoter region B) Regulatory element C) Transcriptional start site D) Enhancer sequence
Which of the following DNA sequences serve as binding sites for transcription factors and can either enhance or repress gene expression? A) Transcriptional start site B) Enhancer sequence C) TATA box D) Regulatory element
The consensus sequence TATAAA or TATAA is commonly associated with which promoter element in eukaryotic genes? A) Enhancer sequence B) Transcriptional start site C) TATA box D) Regulatory element
Which feature of most promoters influences the rate of transcription initiation by interacting with transcription factors and the transcriptional machinery? A) TATA box B) Transcriptional start site C) Enhancer sequence D) Regulatory element

In bacterial gene regulation, the binding of a repressor protein to the operator region of the DNA: A) Activates transcription B) Inhibits transcription C) Enhances translation D) Initiates DNA replication
The lac operon in E. coli is an example of: A) Positive regulation B) Negative regulation C) Constitutive gene expression D) Post-transcriptional regulation
Which molecule binds to the operator of the lac operon to prevent RNA polymerase from transcribing the structural genes? A) Inducer B) Repressor C) Activator D) Corepressor
The binding of an inducer molecule to the repressor in the lac operon leads to: A) Repression of gene expression B) Activation of gene expression C) Inhibition of translation D) Degradation of mRNA
The trp operon in bacteria is controlled by a repressor that is inactive when bound to: A) Tryptophan B) Glucose C) Lactose D) CAMP

1. Which of the following molecules bind to DNA and enhance gene transcription?

A) Activators

B) Repressors

C) Small effector molecules

D) Transcription factors

2. What is the main function of repressors in gene regulation?

A) Enhance gene transcription

B) Inhibit gene transcription

C) Initiate translation

D) Promote mRNA stability

3. Small effector molecules can act as signaling molecules to regulate gene expression by:

A) Enhancing transcription

B) Inhibiting transcription

C) Stabilizing mRNA

D) Promoting protein degradation

4. Catabolism refers to:

A) Breakdown of complex molecules into simpler ones

B) Synthesis of complex molecules from simpler ones

C) Promotion of gene expression

D) Inhibition of protein synthesis

5. Anabolism involves:

A) Synthesis of complex molecules from simpler ones

B) Breakdown of complex molecules into simpler ones

C) Decrease in gene expression

D) Promotion of protein degradation

1. In the Lac operon of E. coli, the DNA sequence where the repressor protein binds to prevent transcription is called the:

A) Promoter

B) Operator

C) Enhancer

D) Regulator

2. Polycistronic mRNA in the Lac operon contains coding sequences for:

A) Multiple enzymes

B) A single enzyme

C) tRNA molecules

D) Ribosomal proteins

3. The structural genes of the lactose operon encode proteins involved in:

A) Lactose metabolism

B) Protein synthesis

C) Lipid synthesis

D) DNA replication

4. The Lac operon in E. coli is considered inducible because:

A) It is always transcribed

B) It is only transcribed in the presence of lactose

C) It is never transcribed

D) It is constitutively active

5. Which of the following is NOT a structural gene of the Lac operon?

A) LacZ

B) LacY

C) LacI

D) LacA