Which epidermal cell produces the pigments that lead to the coloration of the skin?
a. Collagen fibers
b. Keratinocytes
c. Melanocytes
d. Stratified squamous epithelium
e. Elastin fibers
c
Biology & Microbiology
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Patients with pyruvate dehydrogenase complex deficiency develop neurological symptoms. Patients with this disease
fail to make the substrates required for which metabolic process?
a. pyruvate oxidation b. oxidative phosphorylation c. glycolysis d. the citric acid cycle e. fatty acid oxidation
Biology & Microbiology
A linear stretch of DNA that specifies the sequence
of amino acids in a polypeptide is called a(n) a. codon. b. intron. c. messenger. d. gene. e. enzyme.
Biology & Microbiology
Centrioles are only found in plant cells
a. True b. False
Biology & Microbiology
During which phase does the nuclear envelope begin to break down?
a. prophase b. metaphase c. prometaphase d. telophase e. cytokinesis
Biology & Microbiology