Which of the following tissue types are found only in the zone of cell division of the root tip?
A. ground meristem
B. endodermis
C. xylem & phloem
D. None of these are restricted to just the zone of cell division of the root tip.
E. All of these are restricted to the zone of cell division of the root tip.
Answer: D
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Acetylcholine is a neurotransmitter that binds to receptors on skeletal muscle cells. The receptor-signal complex brings about a series of events that result in contraction of skeletal muscle
Venom from black widow spiders causes an explosive release of acetylcholine. What would that do to its victims? A) The victim's muscles would be unable to contract. B) The victim's muscles would be unable to relax. C) The victim's cell receptors would no longer be able to bind regulatory hormones. D) The victim's cell receptors would be able to bind regulatory hormones but at a rate greatly exceeding normal rates.
In total, a sensory system includes:
a. a sensory receptor b. nerve pathways from the receptor to the brain c. brain regions where the sensory information is processed d. a sensory receptor and nerve pathways from the receptor to the brain only e. a sensory receptor and nerve pathways from the receptor to the brain regions that process the information
Annelids:A
have a visceral mass. B. have a segmented body. C. surround their body with a mantle. D. move with a muscular foot. E. have an open circulatory system
In human females, the ovarian cycle begins when the ________
A) levels of estrogen reach their maximum B) hypothalamus stimulates the anterior pituitary to increase its output of FSH and LH C) level of progesterone drops precipitously D) levels of FSH and LH drop precipitously