Biology homework help

Question 1 (4 points)

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Which of the following enzymes is needed to synthesize the DNA molecule from the viral RNA genome;

Question 1 options:

DNA polymerase

RNA polymerase

Reverse transcriptase

Replicase

Question 2 (4 points)

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Viruses that persist in the cell and cause recurrent disease are considered;

Question 2 options:

Oncogenic

Cytopathic

Latent

Resistant

Question 3 (4 points)

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The capsid is composed of protein subunits called;

Question 3 options:

Spikes

Protomers

Virions

Capsomers

Question 4 (4 points)

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The envelope of an animal virus is derived from the ………………. Of its host cell

Question 4 options:

Cell wall

Cell membrane

Glycocalyx

Receptors

Question 5 (4 points)

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The nucleic acid of a virus is;

Question 5 options:

DNA only

RNA only

Both DNA and RNA

Either DNA or RNA

Question 6 (4 points)

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Enveloped viruses carry surface receptors that act as recognition sites for subsequent binding and infection of other cells, these surface receptors are called;

Question 6 options:

Buds

Spikes

Fibers

Sheath

Question 7 (4 points)

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Example of virus that alters the genetic set of a host cell and transforms it to cancer cell is;

Question 7 options:

Herpes Simplex Virus

HIV

Papillomavirus

Flu virus

Question 8 (4 points)

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Spikes on enveloped viral surfaces helps in;

Question 8 options:

Replication

Entry

Integration into host genome

Assembly of viral particles

Question 9 (4 points)

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Endotoxins are found in which of the following organisms;

Question 9 options:

G + bacteria

G – bacteria

Both G + and G – bacteria

Some fungi

Question 10 (4 points)

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Formation of biofilms is mediated by which part of the cell;

Question 10 options:

Flagella

Pili

Fimbriae

Glycocalyx

Question 11 (4 points)

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Bacterial endospores function in

Question 11 options:

reproduction

protein synthesis

survival

storage

Question 12 (4 points)

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Clostridium botulinum is a virus that causes neurotoxic effects (paralysis) in infected individuals.

Question 12 options:TrueFalse

Question 13 (4 points)

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Viroids are short pieces of RNA with no protein coat found to infect only plants.

Question 13 options:TrueFalse

Question 14 (4 points)

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Gram positive bacteria is characterized by a thin layer of peptidoglycan on its outer membrane

Question 14 options:TrueFalse

Question 15 (4 points)

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A plasmid is a critical piece of DNA necessary for bacterial life.

Question 15 options:TrueFalse

Question 16 (4 points)

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Undifferentiated lymphocytes exist in;

Question 16 options:

Thymus gland

Bone marrow

Lymph nodes

The liver

Question 17 (4 points)

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Lymphocytes differentiate to T and B lymphocytes at

Question 17 options:

Trachea and Brain

Tonsils and blood

Thymus and Bone marrow

Liver and heart

Question 18 (4 points)

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What type of immune cell first detects and processes antigens and foreign molecules;

Question 18 options:

Antigen presenting cells (APCs)

T lymphocytes

B lymphocytes

None of the above

Question 19 (4 points)

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A molecule that does not initiate an immune response known as

Question 19 options:

Immune misleader

Epitope

Immunoglobulin

Hapten

Question 20 (4 points)

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A molecule that initiates an immune response with an active site for immune cell recognition is known as

Question 20 options:

Immune misleader

Epitope

Immunoglobulin

Hapten

Question 21 (4 points)

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Which of the following immunoglobulin classes is able to cross the placenta

Question 21 options:

IgG

IgA

IgM

IgE

Question 22 (4 points)

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Which of the following immunoglobulin classes is secreted at mucus membranes (salivary glands, intestine, nasal membrane, genitourinary tract…etc)

Question 22 options:

IgG

IgA

IgE

IgM

Question 23 (4 points)

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Which of the following immunoglobulin classes is associated with basophiles and mast cells in blood and mediates allergic reactions

Question 23 options:

IgG

IgA

IgE

IgD

Question 24 (4 points)

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Immunoglobulins are produced by which of the following cells;

Question 24 options:

T lymphocytes

B lymphocytes

Antigen presenting cells

Neutrophils

Question 25 (4 points)

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Which of the following is an example of innate immune system;

Question 25 options:

B lymphocytes

White blood cells

Skin, Saliva, Tears, and stomach acid

The spleen