Answer the following statements true (T) or false (F)
1. Hormones must bind a receptor to elicit a cell response, regardless of whether they operate locally or at long distances.
2. Auxin is a plant hormone that causes cells to shorten and allow plant growing tips to move toward the sun.
3. In terms of cell signaling, estrogen in animal cells works in a similar fashion as the plant hormone auxin via binding to intracellular receptors.
4. G proteins and Ras are activated when bound to GDP.
1. TRUE
2. FALSE
3. TRUE
4. FALSE
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The positions of genes on a genetic map are marked according to
A) degrees. B) nanometers. C) radians. D) minutes.
Daughters of a cross between a white-eyed male and a red-eyed female always have red eyes
A. true B. false
Vascular tissues distribute water and solutes through ground tissue. In ____, water and ions flow through tubes of dead tracheids and vessel elements
a. sclerenchyma b. parenchyma tissue c. ground tissue d. xylem e. phloem
__________ and __________ are single-celled heterotrophs with a secreted shell. Fill in the blank(s) with the appropriate word(s)