Describe the operon hypothesis and how it explains the control of the messenger RNA production and the regulation of protein synthesis in bacterial cells. The operon is a group of genes coding for proteins with related functions and they are arranged in units. The operon is made up of the promoter‚ structural genes and the operator. Transcription depends on the regulator‚ it may be located anywhere on the bacterial chromosome. The regulator codes for the repressor‚ which binds to the operator
Premium Gene DNA Gene expression
This would determine the expression of a shorter protein.10 Moreover‚ the mRNA containing the premature stop codon was targeted by the nonsense mediated decay pathway which functions to decrease the expression of a potentially harmful truncated protein. Although this mechanism is hypothetical‚ it has been demonstrated that in cells derived from t(1;11) carriers DISC1 expression is reduced at both mRNA
Premium DNA Genetics Gene
densely mark the circle corresponding to your choice and make all erasures complete. When you have completed your exam‚ turn in your scan sheet at the front of the room. 1. The primary structure of a protein represents: (*) the amino acid sequence. (2) the functional configuration. (3) the subunits of a protein. (4) a pleated sheet. (5) a alpha helix. 2. In prokaryotes‚ most genes are organized into operons. One component of an operon is the structural genes. Which of the following best describes a structural
Premium RNA DNA Gene expression
synthesising proteins and fats‚ releasing energy from glucose. What are the central ideas of Movement of Substances? • What processes describe how substances move from one region to another? – osmosis‚ or – diffusion‚ or – active transport. • What is the above dependent on? – Type of substance – Concentration gradient or water potential gradient. What is the link between Cells & Movement of Substances? • Cells take in raw materials to make new substances such as proteins and fats
Premium Glucose Nutrition Protein
Exam #3 Protein Folding & Post-translational Modifications -What are post-translational modifications? - are modifications that a proteins undergoes to achieve its mature state. Such as cutting‚ folding‚ splicing and other processes. -How do proteins achieve their final conformation? - A protein achieves its final conformation by spontaneously folding. All the information that the protein needs as to how to fold is already located in the amino acid sequence of the protein. -Why is
Premium Protein Cell nucleus Endoplasmic reticulum
Biology: Concepts and Connections‚ 6e (Campbell) Test Bank (1) Part (1) Chapter 1 Introduction: The Scientific Study of Life 1) Which of the following statements about the leopard is false? A) Leopards are the largest cat in the genus Panthera. B) Leopards‚ like lions‚ can roar. C) Leopards prefer to eat their kill in trees. D) Leopards are well-adapted for nocturnal hunting. E) Leopards are normally solitary animals. Answer: A Topic: Opening Essay Skill: Factual
Premium Cell Bacteria Protein
the following questions: What is the difference between Resolution and Magnification? What is the difference between Amplitude contrast and Phase contrast? A student in a cellular biology laboratory is faced with the task of detecting protein X in muscle cells taken from a rat. The tissue is required to be live while under analysis. Which type of microscopy should be employed? a) Phase contrast light microscopy b) Transmission electron microscopy c) Scanning electron microscopy d) Fluorescence
Premium Cell Protein Endoplasmic reticulum
complete): • 20‚000-28‚000 genes in the human genome o The genome was found using a shotgun sequence. o 10% of the genome is Long Intersperse Nuclear Elements (=LINEs). This leaves the questions as to which part of the genome are LINEs? 80‚000-120‚000 proteins in a cell. 200‚000-2‚000‚000 peptides in a cell. o Ex: Insulin A paper looked at 30% of the genome at 5 nucleotide resolutions and found: In terms of transcripts (mRNA) may not have a poly-A tail. 43.7% of transcripts never had a poly-A tail
Premium Protein
of ATP. 3. Which of the following statements is not true concerning glycolysis in anaerobic muscle? a) b) c) d) e) Fructose 1‚6-bisphosphatase is one of the enzymes of the pathway. It is an endergonic process. It results in net synthesis of ATP. It results in synthesis of NADH. Its rate is slowed by a high [ATP]/[ADP] ratio. 4. When a muscle is stimulated to contract aerobically‚ less lactic acid is formed than when it contracts anaerobically because: a) b) c) d) glycolysis does not occur to significant
Premium Protein Citric acid cycle Amino acid
to the environment of viruses‚ bacteria and fungi. Main features include the following but are not limited to them. The name of the bacteria should be italic when typed or underlined when hand written. | Main Features | Virus | Protein coat. DNA or RNA single stranded genetic material. Spikes. Non-Living. No cell membrane. Capsomere. Multiplication by replication. Relies on living cells. No metabolic pathways. Vulnerable outside of the host. | Bacteria | Bacilli (bacillus
Free Bacteria Cell Protein