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حل اسئله المد تأكدو اكثر خاف اكو خطأ النقطه 27 جوابه B

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Which of the following is NOT a component required for DNA replication? a) DNA polymerase b) Helicase c) RNA polymerase d) Primase Which direction does DNA polymerase synthesize new DNA strands? a) 3' to 5' b) 5' to 3' c) 5' to 5' d) 3' to 3' Which of the following best describes the function of the DNA codons UAA, UAG, and UGA? A) Start codons, initiating the process of translation. B) Stop codons, signaling the termination of protein synthesis. C) Codons that code for specific amino acids. D) Regulatory codons, controlling gene expression. Which of the following is NOT a stop codon? a) UAG b) UGA c) AUG d) UAA What is the function of stop codons in protein synthesis? a) They signal the end of translation. b) They initiate translation. c) They indicate the start of transcription. d) They code for specific amino acids. Which of the following statements about the structure of DNA is correct? A) DNA is a single-stranded molecule. B) DNA contains the nitrogenous bases adenine, guanine, cytosine, and uracil. C) DNA is composed of a sugar-phosphate backbone with nitrogenous bases projecting inward. D) DNA strands run in parallel orientation to each other. احياء نظري د ذكرى

_What is the first step in the virus replication cycle? a- Penetration b- Synthesis c- Attachment ✔️ d- Release _ _In which step are viral proteins and nucleic acids synthesized? a- Attachment b- Synthesis ✔️ c- Assembly d- Release __ _one of the more common viruses are: a-COVID-19 b-Influenza c-meningitis d-all of above ✔️ _ _ which virus can lead to AIDS? a- Influenza b- HIV ✔️ c- SARS-CoV-2 d- HPV

'What structure determines the shape of a virus? a- Nucleus b- Capsid ✔️ c- Cell wall d- Mitochondria ____ _How many triangular faces does an icosahedron have? a- 10 b- 15 c- 20✔️ d- 25 ___ _Which of the following viruses has an icosahedral shape? a- Rabies b- Measles c- Herpes simplex✔️ d- Tobacco mosaic virus ____ _What shape is described as a spiral, similar to DNA? a- Icosahedron b- Helix✔️ c- Complex d- Cubic ___ 5. Which of the following viruses has a helical shape? a- Polio b- Chicken pox c- Measles✔️ d- Herpes simplex __ _Which shape is a combination of two other shapes? a- Helix b- Icosahedron c- Complex✔️ d- Spherical ____ _Which of the following is an example of a complex-shaped virus? a- Tobacco mosaic virus b- Polio c- Rabies d- Bacteriophage✔️

_ What is the typical size range of most viruses? A_ 2-25 nm B_ 20-250 nm✔️ C_ 250-500 nm D_ 500-1000 nm ___ _viruses that infect bacteria are known as... A-bacteriophage B-genome C-phage D-A&C ✔️ ___ _What is a virulent phage? A- A phage that infects animals. B- A phage that always lysogenizes its host. C- A phage that always lyses its host cell.✔️ D- A phage that contains an envelope. ___ _What type of genetic material can be found in a viral genome? A- Both DNA and RNA B- Only DNA C- Only RNA D- Either DNA or RNA but not both ✔️ _ _the capsid of virus made up of subunits called.. A-capsomeres ✔️ B-nucleocapsid C-envelope D-None of all __ _the capsid is... A-outer protein coat ✔️ B-inner Protein coat C-structure inside the cell D-D-None of all ____ _one of the structural virus components that not found in all viruses is .. A-Genome B-capsid C-viral envelope✔️ D-all of above

احياءعملي محاضرة "4" _What are viruses? A_ Small cells B_ small Obligate intracellular parasites ✔️ C_ Multicellular organisms D_ Plants ___ _what is the basic structure of a virus? A_ Nucleic acid surrounded by a membrane B_ Nucleic acid surrounded by a protein coat ✔️ C_ Ribosomes surrounded by a lipid layer D_ Mitochondria surrounded by a cell wall __ _Where can viruses replicate? A_ Outside living cell B_ Anywhere in the environment C_ Only within living cells ✔️ D_ Only within non-living materials _ _What is the term for the combination of a capsid and genome in a virus? A_ Capsule B_ Nucleolus C_ Nucleocapsid ✔️ D_ Endosome ____ _Viruses have an inner core of nucleic acid surrounded by a protein coat known as an... A- Capsid B- Envelope ✔️ C- Nucleocapsid D- Matrix

False lactobacillus الإختيار الصح

اسئلة احياء اجت منه بل مد

-classification based on..... a-ingredients b-physical state ✔️ c-color d-a & c

._classification of bacteria based on: a-gram stain sensitivity ✔️ b-mode of respiration c-physical state d-shape of bacteria

_bacteria that show no results on coming in contact with gram Stain are: a- Gram-positive bacteria b- Gram-negative bacteria ✔️ c- cocci-shaped bacteria d- a & b __ _respiration that refers to the partial breakdown of glucose in the absence of oxygen is: a-aerobic respiration b-Anaerobic respiration ✔️ c-partial respiration d-None of all _ _Classification of medium based on physical state into: a-solid media b-semi-solid media c-liquid media d-all of above ✔️ _ _liquid media are sometimes referred as... a-blood agar b-chocolate agar c-soft d-broth ✔️ ____ _one of the major harmful activities of bacteria are: a-food poisoning b-spoilage of food c-bacterial diseases d-all of above ✔️

_The name of the bacteria that found in the milk are... a-streptococcus ✔️ b-Staphylococcus c-lactobacillus d- a & c ___ _microorganisms that can cause disease are... a-normal flora b-bacteremia c-septicemia d-Pathogen ✔️ _ _"blood agar" culture media a-Enriched media ✔️ b-transport media c-differential media d-selective media _ _"TCBS" culture media.. a-Enriched media b-differential media c-selective media ✔️ d-transport media ____ _Differential media... a-Macconkey agar b-XLD agar c-TCBS agar d-all of above ✔️ ____ _Mueller- Hinton agar.. a-selective media b-Enriched media c-susceptibility media ✔️ d-transport media ____ _What type of media is used to demonstrate bacterial motility?    A_ Solid media    B_ Semi-solid media ✔️    C_ Liquid media    D_ Complex media

_one of the outer structures of bacteria is... a-Plasma membrane b-plasmid c-capsule ✔️ d-Ribosome _ _The function of the plasmid is: a-Cellular growth b-protein synthesis c-exchanging DNA between the bacterial cells ✔️ d-controlling the movement of substances in the cell ____ _the following is not one of the Inner structures of bacteria: a-cytoplasm b-mesosome c-Pili ✔️ d-spores _ _bacteria have rod-shaped are commonly called... a-cocci b-bacilli ✔️ c-strepto d-Staphylo ___ _Bacteria resembling a comma ( , )shape Example : a-staphylococcas b-vibrio cholera ✔️ c-Lactobacillus d-Salmonella typhi

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