In plants with only primary growth, the epidermis is not
A. one cell thick.
B. the outer protective coating of the plant.
C. produced by the protoderm.
D. covered by a waxy layer that constitutes the cuticle.
E. covered with bark.
E. covered with bark.
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The dermis of mammalian skin, including that of humans, contains a large amount of extracellular matrix proteins, including collagen and elastin. As a person ages, the amount of elastin in the dermis declines
Which of the following cell types is likely to be the cause of this change in the dermis of the skin? A. keratinocytes B. fibroblasts C. melanocytes D. epidermal cells
Higher chromosome structure depends on:
A. SMC proteins, one of the major components of the chromosome scaffold. B. the formation of a chromosome scaffold by topoisomerases. C. the presence of the H1 protein, which promotes formation of the nucleoid. D. the formation of rosettes, which are stabilized by histone proteins. E. the formation of tetranucleosomes.
The teeth designated by the letter "D" in the
above figure are called a. canines. b. premolars. c. incisors. d. molars. e. none of these
The absolute refractory period refers to the brief period of time:
A) during which a postsynaptic receptor cannot bind another neurotransmitter after is has been open B) after a neuron has fired an action potential during which the same neuron cannot fire another action potential C) after exocytosis and before the release of more neurotransmitter from the presynaptic cleft D) following a response to a difficult exam questions during which no other information can be processed