Murein - Study guides, Revision notes & Summaries

2023 AQA AS BIOLOGY 7401/1 Paper 1 Question Paper & Mark scheme (Merged) June 2023 [VERIFIED] Candidate number I declare this is my own work. AS BIOLOGY Paper 1 Monday 15 May 2023 Morning Time allowed: 1 hour 30 minutes Materials For this paper you must have: • a ruler with millimetre measurements • a scientific calculator. Instructions • Use black ink or black ball-point pen. • Fill in the boxes at the top of this page. • Answer all questions. • You must answer the...

AQA AS BIOLOGY 7401/1 Paper 1 Version: 1.0 Final *JUN* IB/M/Jun23/E8 7401/1 For Examiner’s Use Question Mark 1 2 3 4 5 6 7 8 9 TOTAL Monday 15 May 2023 Morning Time allowed: 1 hour 30 minutes Materials For this paper you must have: • a ruler with millimetre measurements • a scientific calculator. Instructions • Use black ink or black ball-point pen. • Fill in the boxes at the top of this page. • Answer all questions. • You must answer the questions in t...

AQA AS BIOLOGY 7401/1 Paper 1 Version: 1.0 Final *JUN* IB/M/Jun23/E8 7401/1 For Examiner’s Use Question Mark 1 2 3 4 5 6 7 8 9 TOTAL Monday 15 May 2023 Morning Time allowed: 1 hour 30 minutes Materials For this paper you must have: • a ruler with millimetre measurements • a scientific calculator. Instructions • Use black ink or black ball-point pen. • Fill in the boxes at the top of this page. • Answer all questions. • You must answer the questions in t...

aqa AS BIOLOGY Paper 1 (7401/1) May 2023 Question Paper. 1. Describe the primary structure of all proteins. 2. This question is about the genetic code. Define universal, non-overlapping and degenerate. 3. Describe how the appearance of the area containing DNA in a TEM image of a eukaryotic cell would differ from that shown in Figure 1. 4. Describe one difference between the structure of DNA in a prokaryotic cell and in a eukaryotic cell. 5. Streptococcus bacteria can infect the lungs when air i...

AQA A LEVEL BIOLOGY Paper 1 Latest Update Cell vacuole (plants) - ANSWER-Found in cytoplasm. Contains cell sap. Membrane surrounding this is called the tonoplast. Maintains pressure inside the cell, keeping cell rigid/stops wilting. Cell wall - ANSWER-Made of murein (glycoprotein).

What is a function of a prokaryotic cell membrane? a. Lipid synthesis b. Protein secretion c. Respiratory electron transport d. Osmotic barrier e. All of these are true CORRECT ANSWER E. All of these are true Which of the following cell components would not be found on a gram-positive, circular-shaped bacterium? a. Outer membrane b. Teichoic acids c. S layer d. Flagellum e. Murein CORRECT ANSWER A. Outer membrane Which structure can give more rigidity to the cell wall? a. Pili ...

What is not a function of a prokaryotic cell membrane? (A) Protein synthesis (B) Protein secretion (C) Respiratory electron transport (D) Osmotic barrier (E) Lipid synthesis CORRECT ANSWER (A) Protein synthesis Which of the following cell components would not be found on a gram-positive, circular shaped bacterium? (A) Murein (B) Teichoic Acids (C) S layer (D) Flagellum (E) Outer Membrane CORRECT ANSWER (E) Outer Membrane Which structure provides resistance to desiccation? ...

Bacteria Structure Capsule, outer membrane (only in gram-negative bacteria), cell wall murein, cytoplasmic membrane, nucleus equivalent, plasmid, 70S ribosomes, depot substances (metaphosphates, glycogen), flagella, attachment pili Gram-Positive Bacteria Thick peptidoglycan membrane (cross-links between NAM + peptide and NAG)

AQA AS BIOLOGY Paper 1 Monday 15 May 2023 Morning Time allowed: 1 hour 30 minutes Materials For this paper you must have: • a ruler with millimetre measurements • a scientific calculator. Instructions • Use black ink or black ball-point pen. • Fill in the boxes at the top of this page. • Answer all questions. • You must answer the questions in the spaces provided. Do not write outside the box around each page or on blank pages. • If you need extra space fo...

MCB 2610 Exam 3 Question and answers correctly solved 2024/2025 MCB 2610 Exam 3 functions of bacterial cell wall - correct answer maintains the shape of the bacterium, helps protect the cell from osmotic lysis (rupturing), helps protect from toxic materials, may contribute to pathogenicity cell wall - correct answer peptidoglycan (murein)- rigid structure that lies just outside the cell membrane; two types based on gram stain- gram positive and gram negative peptidoglycan structur...