Which of the following bonds is the weakest?
A. The hydrogen bond
B. The covalent bond
C. The ionic bond
D. All three bonds are roughly equal in strength
Answer: A
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The organism that can be encountered in the conjunctival sac and that exists as indigenous flora is:
a. Staphylococcus epidermidis. b. Bacteroides fragilis. c. Staphylococcus aureus. d. Moraxella lacunata.
Studies of mitochondrial DNA among maternally related individuals allow recent____ to be identified
a. mutations b. genomes c. master genes d. amino acid sequences e. lineages
Class __________ includes mostly extinct species and a few current species such as feather stars and
sea lilies. a. Asteroidea b. Holothuroidea c. Ophiuroidea d. Echinoidea e. Crinoidea
Which one of the following is TRUE regarding skin?
A) Beneath the dermis is the basement membrane, which separates the dermis from the hypodermis. B) Keratin is a protein in the cells of the epidermis that provides strength and waterproofing. C) Melanocytes and keratinocytes are two skin cell types that are prevalent in the dermis. D) The sebaceous glands and the sweat glands are two types of endocrine glands located in the dermis. E) Melanocytes produce calcium, which strengthens the skin.