What factor(s) relating to cells account(s) for the
larger size of elephants compared to mice?
a. size
b. composition
c. weight
d. number
e. all of these
Answer: d
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A ____ lays water-proof eggs and nourishes its young with milk from glands
a. turtle b. shark c. platypus d. rat e. Gila monster
Research has shown that cytokinin levels fluctuate seasonally in temperate plants. What season would you expect to see the lowest levels of cytokinins and why would this be adaptive?
A. Spring, because lower levels of cytokinin allow auxin to promote rapid growth in stem height. This will allow the plant to compete effectively for sunlight. B. Winter, because lower levels of cytokinin will place buds into a dormant state. This will protect the underlying tissues from freezing until spring. C. Autumn, because lower levels of cytokinin at this time of year will induce the production of ethylene. This will result in maturation of fruit and ensure effective seed dispersal before winter. D. Summer, because lower levels of cytokinin would slow growth down and delay leaf aging. This will allow the plant to maximize the production of starch and increase it's sugar reserves. This will help ensure the plant's survival through autumn and winter.
Induced pluripotency is a term related to ___
A. producing stem cells from normal body cells B. cloning animals like Dolly the sheep C. the discovery of mutated genes that cause disease D. the decoding of the human genome E. the practice of eugenics
Peripheral chemoreceptors are specialized cells in contact with arterial blood that respond directly to changes in blood
A) pH. B)PO2. C) PCO2. D) PCO2 andPO2. E) PO2, pH, andPCO2.