Steroid hormones act by
a. interacting with a target cell's DNA.
b. activating mitochondria in target cells.
c. acting on ribosomes for protein synthesis.
d. stimulating mitosis.
e. helping glucose into the target cell.
A
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Which of the following defines epigenetic gene regulation?
a. regulation when the DNA is uncoiled and loosened at the nucleosomes to bind transcription factors b. regulation after translation c. regulation when RNA is processed and exported to the cytoplasm after it is transcribed d. regulation when RNA is translated to protein
The principal driving force for movement of water into and through the plant shoot is
a. passive transport. b. sunlight. c. root pressure. d. upward pressure as sugar is forced into the roots. e. pumping by the xylem cells.
A hummingbird is "drinking" nectar containing sugar from a red columbine flower. Arrange the following events to occur in the hummingbird in order from the first to last: (1 ) Glucose sugar is converted to pyruvate. (2 ) Energy from high-energy electrons is released from an electron transport chain. This energy is used to make ATP. (3 ) The hummingbird exhales carbon dioxide and energy is stored
in electron carriers. (4 ) The hummingbird has the ability to beat its wings 40 - 80 times a second. a. 1, 4, 3, 2 b. 2, 1, 3, 4 c. 1, 2, 3, 4 d. 2, 3, 4, 1 e. 1, 3, 2, 4
Just deep to periosteum, but superficial to endosteum, these layers of lamellae extend around entire surface of diaphysis. Help long bone to resist twisting.
What will be an ideal response?