2. An epithelial tissue formed by more than one layer of cells and with column-like cells at the surface is called
(a) simple squamous.
(b) stratified squamous.
(c) simple columnar.
(d) stratified columnar.
(a) simple squamous.
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Which of the following is a major finding from the ENCODE project?
A. DNA methylation usually signifies the activation of gene expression B. In humans, one gene encodes exactly one protein. C. Gene regulation is achieved through a complex network of regulatory regions throughout the genome. D. Less than 20% of human DNA is linked to biological function. E. There are more than 10 million regulatory sites in human DNA.
Which of the following most adequately describes how the Alu element may have proliferated to constitute 10% of the human genome?
A. Multiple retroelements code the same gene. B. Retroelements increase with every generation. C. A single retroelement can be copied into many RNA transcripts. D. Retroelements increase with each cell division. E. Retroelements show self-proliferation.
A male patient at a medical clinic presents with infertility due to nonmotile sperm and an inability to clear mucous from his respiratory tract. Other tissues are normal. You suspect that these symptoms may be caused by mutant
a. tubulin. b. kinesin. c. dynein. d. tau protein. e. MAP 1.
The information stored in the DNA sequences is used directly as a template to make ___________
(a) lipids. (b) RNA. (c) polypeptides. (d) carbohydrates.