Which one of the following features is absent in a virus? (1) reproduce within host cell (2) presence of cell wall (3) fully parasitic in nature (4) presence of either DNA or

1 Answer

Answer :

(2) presence of cell wall Explanation: A virus has a simple structure. It has no internal cellular structure, no cell wall or cell membrane, just the protein coat that holds the string of nucleic acid. It is made only of a nucleic acid + a protein coat. A cell wall is a layer located outside the cell membrane found in plants, fungi, bacteria, algae, and archaea.

Related questions

Description : Which one of the following features is absent in a virus ? (1) reproduce within host cell (2) presence of cell wall (3) fully parasitic in nature (4) presence of either DNA or RNA

Last Answer : presence of cell wall 

Description : At which stage of HIV infection does one usually show symptoms of AIDS? (a) Within 15 days of sexual contact with an infected person (b) When the infected retro virus enters host cells (c) ... large number of helper T  - lymphocytes (d) When the viral DNA is produced by reverse transcriptase

Last Answer : (c) When HIV damages large number of helper T  - lymphocytes

Description : Which one of the following matches is correct? (a) Mucor Reproduction by conjugation Ascomycetes (b) Agaricus Parasitic fungus Basidiomycetes (c) Phytophthora Aseptate mycelium Basidiomycetes (d) Alternaria Sexual reproduction absent

Last Answer : (d) Alternaria Sexual reproduction absent

Description : A virus must do what to reproduce? a) form a latent virus b) undergo transformation c) infect a cell d) conjugate 

Last Answer : ANSWER: C -- INFECT A CELL

Description : Which abiotic factors would a parasitic strangler fig and its host tree compete for?

Last Answer : i dont know

Description : To ensure that supporting area of an offset footing of a boundary wall is fully compressive, the C.G. of load must act (A) At the centre of the base (B) Within the middle third of the base (C) Within the middle fifth of the base (D) Neither (a), (b) nor (c)

Last Answer : Answer: Option B

Description : When a cell reproduce what happens to its DNA?

Last Answer : Need answer

Description : The film co-efficient is decreased due to the presence of non-condensing gases in the vapors. The film co-efficient of superheated vapor as compared to that of saturated vapor is (A) More (B) Less (C) Some (D) Either more or less; depends on the nature of vapor

Last Answer : (C) Some

Description : When no signal is being received, the loudspeaker is not entirely silent as a result of the presence of A. parasitic oscillations in some of the receiver stages. B. negative feedback in each stage. C. spurious frequencies as a result of improper neutralization. D. internal receiver noise.

Last Answer : D. internal receiver noise.

Description : A …………………….. creates copies during replication that are functionally equivalent but have distinctly different bit patterns. A) Boot Sector Virus B) Polymorphic Virus C) Parasitic Virus D) Macro Virus

Last Answer : B) Polymorphic Virus

Description : . …………………….. is a form of virus explicitly designed to hide itself from detection by antivirus software. A) Stealth virus B) Polymorphic Virus C) Parasitic Virus D) Macro Virus

Last Answer : A) Stealth virus

Description : A ………………… attaches itself to executable files and replicates, when the infected program is executed, by finding other executable files to infect. A) Stealth virus B) Polymorphic Virus C) Parasitic Virus

Last Answer : C) Parasitic Virus

Description : Pick up the wrong statement. (a) Some fungi are edible. (b) Nuclear membrane is present in Monera. (c) Cell wall is absent in Animalia. (d) Protists have photosynthetic and heterotrophic modes of nutrition.

Last Answer : (b) Nuclear membrane is present in Monera.

Description : Cell wall is absent in (a) Mycoplasma (b) Nostoc (c) Aspergillus (d) Funaria

Last Answer : (a) Mycoplasma

Description : What is true about Taenia saginata? (a) Life history has pig as intermediate host. (b) There are two large suckers on scolex. (c) Rostellar hooks are absent. (d) Rostellum has double circle of hooks.

Last Answer : (c) Rostellar hooks are absent.

Description : Which of the following are correct for the cell which has naked ds circular DNA? (a) Both 70S and 80S ribosome (b) Histone absent ( c ) Compartmentali

Last Answer : Which of the following are correct for the cell which has naked ds circular DNA? (a) Both 70S and 80S ribosome (b) ... b and c C. a and c D. b and d

Description : How can a computer virus reproduce itself?

Last Answer : I think I have an idea of how this is done. If the program knows where it is located in the computer’s memory, it can run a loop to move each sequential line.

Description : A virus needs a _____________ to reproduce?

Last Answer : There is no other living thing that requires a virus in order to reproduce.

Description : The hydrophilic nature of DNA is due to the presence of – (1) thymine base (2) Biotic resources (3) phosphate group (4) deoxyribose sugar

Last Answer : (2) Biotic resources Explanation: The phosphate groups on DNA are ionic and charged. Each phosphategroup on the DNA back-bone is one unit of negative charge (-1). Charged molecules ... DNA has two hydrophilic polar external backbones made of sugars and phosphate groups joined by ester bonds.

Description : The hydrophilic nature of DNA is due to the presence of - (1) thymine base (2) a number of hydrogen bonds (3) phosphate group (4) deoxyribose sugar

Last Answer : (2) a number of hydrogen bonds Explanation: The phosphate groups on DNA are ionic and charged. Each phosphate group on the DNA back-bone is one unit of negative charge (-1). Charged ... . DNA has two hydrophilic polar external backbones made of sugars and phosphate groups joined by ester bonds.

Description : The hydrophilic nature of DNA is due to the presence of : (1) thymine base (2) a number of hydrogen bonds (3) phosphate group (4) deoxyribose sugar

Last Answer : a number of hydrogen bonds

Description : The genome of a virus may contain either ______ or ______. a. DNA; protein b. protein; carbohydrate c. carbohydrate; RNA d. RNA; DNA

Last Answer : d. RNA; DNA

Description : Why did nature cause male and female to evolve, when the best method would have been to continue to asexually reproduce?

Last Answer : Why do you assume that asexual reproduction is “the best method”? I, in fact, would argue that evolution indicates that it’s not the best method to get the gene pool mixing.

Description : Assetion: Insertion of recombinant DNA within the coding sequence of `beta-`galactosidase result n colourless colonies. Reason : Presence of insert re

Last Answer : Assetion: Insertion of recombinant DNA within the coding sequence of `beta-`galactosidase result n ... D. If both assertion and reason are false

Description : When a cell is fully turgid, which of the following will be zero? (a) Turgor pressure (b) Water potential (c) Wall pressure (d) Osmotic pressure

Last Answer : (b) Water potential

Description : How does a virus get into a host cell? -Biology

Last Answer : answer:

Description : What event is the first event that occurs when a virus infects a host cell?

Last Answer : The virus attaches to the host cells membrane.

Description : The function of a viral capsid is A.protection against the viral genome from physical and enzymatic destruction B.providing binding sites that enable the virus to attach to specific receptor sites on the host ... C.serving as a vehicle of transmission from one host to another D.all of the above

Last Answer : D.all of the above

Description : A viral load test detects the A- provirus of HIV in infected cells B- .total amount of virus in the infected host C- number of viruses being released by each infected cell D- .amount of bacteriophage being produced by E. coli cells

Last Answer : provirus of HIV in infected cells

Description : Recombination of virus genomes occurs A- by transduction B- by transcription C- simultaneous infection of a host cell by two viruses with homologous chromosomes D- by transformation

Last Answer : simultaneous infection of a host cell by two viruses with homologous chromosomes

Description : Choose the correct statement about amantadine: A. It is an antimetabolite used for viral infections B. It prevents penetration of the virus into the host cell C. It is used ... during an influenza A2 epidemic D. Concurrent administration of amantadine prevents antibody response to influenza vaccine

Last Answer : C. It is used to protect high risk subjects during an influenza A2 epidemic

Description : Are there any web host resellers that allow you to fully customise the control panels that the client sees?

Last Answer : I’ve found Yolasite.com and Weebly.com to be useful in advertizing my Zazzle stores. They are free and very customizable. I hope that helps!

Description : State whether the following statements are true / false: 1) A fully qualified domain name starts with a specific host and ends with a top-level domain. 2) Domain names are always written as fully qualified domain names. A. 1.T, 2.T B. 1.T, 2.F C. 1.F, 2.T D. 1.F, 2.F

Last Answer : B. 1.T, 2.F

Description : The Pneumococcus experiment proves that (a) bacteria do not reproduce sexually (b) RNA sometime controls the production of DNA and proteins (c) DNA is the genetic material (d) bacteria undergo binary fission.

Last Answer : (d) bacteria undergo binary fission.

Description : The following are true about the smooth muscle cells: a. presence of a striated appearance b. do not contain actin and myosin c. spontaneous muscle contraction d. mitochondria are absent

Last Answer : spontaneous muscle contraction

Description : The following are true about the smooth muscle cells: a. presence of a striated appearance b. do not contain actin and myosin c. spontaneous muscle contraction d. mitochondria are absent

Last Answer : spontaneous muscle contraction

Description : Glycolate induces opening of stomata in (a) presence of oxygen (b) low CO2 concentration (c) high CO2 (d) CO2 absent.

Last Answer : (b) low CO2 concentration

Description : The complement system consists of a series of serum proteins that exist in a quiescent or very low-level state of activation in the uninfected host. Which of the following ... certain complement components serve as chemoattractants to additional cellular components of the host defense mechanism

Last Answer : Answer: a, c, d Complement activation can occur through either classic or alternate (properdin) pathways, both of which eventuate in deposition of terminal complement pathway components on the ... and release of lysosomal enzymes that can directly damage certain target tissues, such as the lung

Description : A condition in which either pollen is absent or non functional in flowering plants.

Last Answer : Ans. Male Sterility

Description : Cytokines are low-molecular-weight polypeptides exerting a wide variety of biologic effects at both local and systemic levels. Which of the following statement(s) is/are true concerning the production and ... effects on the host d. Each specific cytokine is produced by a single cell type

Last Answer : Answer: c Macrophages, endothelial cells, lymphocytes, and other cells secrete a large number of different compounds, termed cytokines, that are most probably evolved for the purpose of ... host defenses, exerting both salutatory and deleterious effects on the host, has become increasingly evident

Description : Increasing evidence has implicated gram-negative bacterial lipopolysaccharide (LPS endotoxin) as the portion of the gram-negative bacterial cell membrane responsible for many, if not all the ... host, exerting deleterious effects on the host when excessive amounts reach the systemic circulation

Last Answer : Answer: a, b, d The LPS molecule exerts diverse effects on the mammalian host. Immunologic responses to LPS include nonspecific polyclonal B-cell proliferation, macrophage activation and ... deleterious effects on the host only after large amounts are secreted and reach the systemic circulation

Description : Cholesterol is Amphipathic in nature because _________ a. It has hydrophilic regions. b. It has hydrophobic regions. c. It has both hydrophilic and hydrophobic regions. d. Both hydrophilic and hydrophobic regions are absent.

Last Answer : c. It has both hydrophilic and hydrophobic regions.

Description : The transverse section of a plant shows following anatomical features : (i) Large number of scattered vascular bundles surrounded by bundle sheath (ii) Large conspicuous parenchymatous ground ... (a) Monocotyledonous stem (b) Monocotyledonous root (c) Dicotyledonous stem (d) Dicotyledonous root

Last Answer : (a) Monocotyledonous stem

Description : In the light of recent classification of living organisms into three domains of life (bacteria, archaea and eukarya), which one of the following statements is true about archaea? (a) Archaea ... respects. (d) Archaea have some novel features that are absent in other prokaryotes and eukaryotes.

Last Answer : (d) Archaea have some novel features that are absent in other prokaryotes and eukaryote

Description : In genetic engineering, a DNA segment (gene) of interest, is transferred to the host cell through a vector. Consider the following four agents (i-iv) in this regard and select the correct option about which one or more of these ... ii) and (iv) (b) (i) only (c) (i) and (iii) (d) (ii) and (iv)

Last Answer : (d) (ii) and (iv)

Description : Fully activated pyruvate carboxylase depends upon the presence of (A) Malate and Niacin (B) Acetyl CoA and biotin (C) Acetyl CoA and thiamine pyrophosphate (D) Oxaloacetate and biotin

Last Answer : Answer : B

Description : The bright-flash ERG: a. comes only from the cones b. is generated in a fully dark adapted eye by the highest intensity of light c. can be used to assess the overall retinal integrity in the presence of media opacity d. is abnormal in patients with age-related macular degeneration

Last Answer : can be used to assess the overall retinal integrity in the presence of media opacity

Description : Whcih of the following compound is present in RNA but absent from DNA? (A) Thymine (B) Cytosine (C) Uracil (D) Guanine

Last Answer : Answer : C

Description : Assertion : All muscle follow " all or none" principle. Reason : All muscles contract either fully or do not contract at all depending upon the thresh

Last Answer : Assertion : All muscle follow " all or none" principle. Reason : All muscles contract either fully or ... . D. If both Assertion and Reason are false.

Description : Under ______ debentures, if the issuer fails on payment of either the principal or interest amount, his assets can be sold to repay the liability to the investors A. Secured Debentures B. ... ) C. Fully convertible Debentures (FCD) D. Optionally Convertible Debentures (OCD) E. Unsecured Debentures

Last Answer : A. Secured Debentures Explanation: These instruments are secured by a charge on the fixed assets of the issuer company. So if the issuer fails on payment of either the principal or interest amount, his assets can be sold to repay the liability to the investors.