Using a random mutagenesis approach (transposon), you find a xylan degradation mutant in the bacterium *Prima exanimii*. This mutant has the observed phenotype when grown on xylan (open diamonds). You find that the transposon is located in the *xtrA* gene. The growth data and chromosomal region around the *xtrA* gene are shown below: ### Growth Data - **Graph**: The graph plots Optical Density (OD₆₀₀) against time (hours). - **Lines and Symbols**: - WT (wild type) strain: represented by closed circles, shows a steady increase in growth over time, peaking at around 1.0 OD₆₀₀. - ΔxtrA mutant (open diamonds): initial decrease in OD, then remains constant around 0.3 OD₆₀₀ after a short period. - xylA mutant (closed triangles): slight increase, then levels off around 0.4 OD₆₀₀. ### Chromosomal Region - Diagram shows four genes arranged in sequence: - *xtrC* → *xtrB* → *xtrA* → *xtrR* - Arrows indicate the direction of transcription. ### Questions **A.** What is the specific purpose for each of the two other strains shown in the growth experiment (those with black icons)? **B.** "The loss of the *xtrA* gene product is the cause of the growth defect." Do you agree with this interpretation of the data? Explain your answer. **C.** "The *xtrA* mutant strain has a reduced growth rate compared to the WT strain." Do you agree with this interpretation of the data? Explain your answer.

Q: Rearrange the muscles form smallest to largest

A: The sarcolemma is the plasma membrane of the skeletal muscle cell. The muscular system is…

Q: Figure 5-38 Structure of a fascicle Find and label these muscle fascicle components:

A: Muscular system is a type of body system which comprises of muscles that undergo contraction and…

Q: What type of control is this muscle under?

A: The muscular system is made up of special types of cells known as muscle fibers. The main function…

Q: myofibril is only found in straight muscles. True or false

A: Muscles are specialized tissues that are responsible for producing force and movement in the body.…

Q: True/false  Large motor unit is involved with fine-motor movement (precision)

A: A motor unit comprises a motor neuron and the skeletal muscle strands innervated by the axon…

Q: A football player throwing the football is using more fast twitch muscle fibers. True False

A: Muscle fiber referred comprises the individual muscle cell and they can control the physical…

Q: Sarcoplasmic Transverse (T- reticulum Triad Opening of T- tubule Terminal Endomysium Sarcolemma…

A: Tissue is the next level organization of the cells. There are 4 different types of tissue are…

Q: When a muscle is isometrically contracted, its length _______ change.

A: Muscle contraction can be defined as a phenomenon in which there occurs contraction and relaxation…

Q: Motor neuron 1. 4 Muscle fiber nucleus Myofibril of muscle fiber Figure 10.15. Details of the…

A: A neuromuscular junction is a chemical synapse that is formed by the contact between a motor neuron…

Genomic studies

Genomic studies (genomics) is the study of the whole genome of an organism. Using bioinformatics and high-performance computing, genomic researchers examined massive amounts of deoxyribonucleic acid (DNA)-sequence data to discover variations or mutations that affect drug response, health, or disease. Genomics is a much younger discipline than genetics, having only emerged in the last few decades as a result of technological advancements in DNA sequencing and computational biology.