Which protective mechanism of the eye is incorrectly matched with its description?
A) Lacrimal gland: Produces tears
B) Lactoferrin: Binds up free iron which some microbes require
C) Conjunctiva: Transparent layer which protects the iris
D) Tears: Washes away microbes and contains antimicrobial chemicals
E) Lysozyme: Breaks down bacterial cell walls
Answer: C
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Explain how the ch (Himalayan) allele and tyrosinase control the Siamese coat-color pattern. What is the underlying reason that certain parts of a Siamese cat (e.g., tail and ears) are darker than the cat's trunk?
What will be an ideal response?
Before a pathogen can be destroyed in the antibody-mediated process, a T helper cell must recognize a(n) ____ on the
surface of a macrophage. a. antigen-MHC complex b. antibody c. interleukin d. HLA group e. antigen
Pinworm is a nematode parasite that lives in the human rectum and causes itching in the anal area. What best explains the itching symptom?
A. Any kind of parasite will naturally irritate the skin. B. The itching is a side-effect when the immune system has successfully attacked the nematode. C. The itching induces the person to scratch, helping to spread the parasite to another person. D. The itching is because of the mismatch between humans and the parasite's natural host.
Which cell type is a subgroup of lymphocytes, abundant in the liver, and has important roles in innate immune protection against viruses, bacteria, parasites, and even tumor cells?
A) dendritic cells B) T cells C) macrophages D) B cells E) natural killer cells