What organism gave biologists essential clues into the evolution of tetrapods?
a. Vampire squid
b. Neopilina
c. Spirula
d. Coelacanth
d
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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.
Familial hypercholesterolemia is associated with a defect in mitochondrial protein synthesis. Indicate whether the statement is true or false
Ribosomes are very small non-membranous organelles that can either exist freely in the cytoplasm or be embedded in the endoplasmic reticulum of a cell; they are associated with the synthesis of
a. lipids. b. proteins. c. nucleic acids. d. carbohydrates.
Which of the following features do both plant and animal cell possess?
A. Cell walls B. Chloroplasts C. Plasma membrane D. Centrioles