Which of the following statements about mammalian skin is incorrect?
A. The epidermis is an outer layer that
provides a water-resistant, protective barrier.
B. The dermis is the layer below the
epidermis, containing connective tissue,
blood vessels and nerve endings, that
provides nutrients to the epidermis and a
cushion layer for the body.
C. Epithelial cells in the epidermis are
primarily composed of keratinocytes that
protect underlying tissue, and melanocytes
that produce pigments.
D. A specialized form of extracellular matrix,
called the basal lamina, underlies the dermis
and separates it from tissues below.
E. Fibroblasts in the dermis produce
extracellular matrix proteins to make the
dermis strong and flexible.
D
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What is required for a group of clones to be considered a contig?
A. the clones need to have nonoverlapping regions of DNA. B. the clones should contain identical regions of DNA. C. the clones should contain completely unique regions of DNA. D. the clones should have overlapping regions of DNA. E. the clones should have identical, nonoverlapping regions of DNA.
Infection with Streptococcus pyogenes (bacterium that causes strep throat) may generate antibodies or T cells that react with heart muscle, which has a similar structure to the surface of S. pyogenes. These antibodies can damage heart muscle with autoimmune attacks, leading to rheumatic fever. This is an example of which of the following?
a. immunodeficiency b. delayed hypersensitivity c. autoimmune molecular mimicry d. immediate hypersensitivity
Which of the following BEST describes an epitope?
a. the antigen binding site of an antibody molecule b. found only in IgG and IgM c. part of an antigen that stimulates production of, and binds to, a specific antibody d. too small to stimulate an immune response e. a complement protein that initiates lysis of target cells
If a chromosome in one of your bone cells becomes mutated, you will not pass this mutation on to your children because
A. germ cells cannot undergo mitosis. B. germ cells cannot undergo meiosis. C. somatic cells cannot undergo meiosis. D. somatic cells cannot undergo mitosis. E. germ cells neither undergo mitosis nor meiosis.