Answer the following statements true (T) or false (F)
1. Rivets hold steel structures together much in the same way as tight junctions hold cells together.
2. Integrin is a membrane protein that integrates changes in the ECM to alterations in movement or behavior of the cell.
3. Unlike animals, plants lack a cell junction where small molecules can move from one cell to another cell.
4. The heart, skeletal muscles, and blood vessels all share a common feature in that they are composed of muscle tissue.
5. The most prominent tissue type present in plants is the dermis.
1. FALSE
2. TRUE
3. FALSE
4. TRUE
5. FALSE
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CO2 enters the inner spaces of the leaf through the
a) cuticle. b) phloem. c) walls of guard cells. d) epidermal trichomes. e) stoma.
Which of the following is not a reason why two children born to the same parents [not identical twins] are unlikely to have the same genetic makeup?
A) Crossing over recombines portions of sister chromatids. B) Fertilization provides a new pairing of chromosomes. C) Each sperm or egg has a random assortment of chromosomes, half from each pair. D) Chromosomes align themselves independently during meiosis I. E) Since though they are produced at different times, all sperm will be genetically different from all other sperm.
Energy released by the electron transport chain is used to pump H+ ions into which location?
A. cytosol B. mitochondrial matrix C. mitochondrial outer membrane D. mitochondrial inner membrane E. mitochondrial intermembrane space
Which one of the following is considered to be an important plant hormone that helps plants cope with environmental stresses?
A. abscisic acid B. auxins C. ethylene D. cytokinins E. prostaglandins