Answer the following questions true (T) or false (F)
1. Although they produce flowers, cacti with needle-like leaves would be classified as gymnosperms rather than angiosperms.
2. Angiosperm flowers always self-pollinate because they have both male and female reproductive structures.
3. A fibrous root system is made of roots that are all about the same size.
1. FALSE
2. FALSE
3. TRUE
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Kinases are enzymes that
A) add phosphate groups. B) do not alter target activity. C) are always inhibitory. D) remove phosphate groups. E) all of the above
Cancer cells
a. have an abnormal chromosome number. b. are unable to attach to other cells. c. divide to produce high densities of cells. d. have malformed cytoskeletons. e. fit all of these descriptions
Which animal lacks symmetry, has no embryonic tissues, and has intracellular digestion?
a. a cnidarian b. a flatworm c. a sponge d. an annelid e. a planaria
Which of the following neurotransmitters elicits the fight-flight response?
a. acetylcholine b. serotonin c. dopamine d. norepinephrine e. nitric oxide