The cell theory states that the cell is the basic unit of structure for all organisms. What smaller structure would make up the cells of all organisms?
A) cell wall
B) chloroplast
C) nucleus
D) cell membrane
Ans: D) cell membrane
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An air environment, gravity, and desiccation are three challenges that were addressed in the evolution of reptiles. What three evolutionary innovations addressed these challenges?
a. Gills, bony skeleton, and lungs b. The amniotic egg, sturdy fins, and a cartilaginous skeleton c. Dorsal nerve cord, notochord, and a post-anal tail d. . Better limb support, gills, and pharyngeal slits e. Lungs, better limb support, and the amniotic egg
A population of plants experiences several years of severe drought. Much of the population dies due to lack of water, but a few individuals survive
You set out to discover the physiological basis for their adaptation to such an extreme environmental change. You hypothesize that the survivors have the ability to synthesize higher levels of _____ than their siblings do. A) auxin B) gibberellin C) cytokinin D) abscisic acid
The release of small amounts of urine due to sudden increases in abdominal pressure that force urine past the external sphincter is referred to as ________
Fill in the blank(s) with correct word
All of the following pertain to platelets, except
A. they are not whole cells but are pieces of cells. B. they originate from cells called megakaryocytes. C. they function in blood clotting and inflammation. D. they are also called thrombocytes. E. they contain hemoglobin to transport oxygen and carbon dioxide.