Answer the question using the accompanying figure. In the internal leaf structure, the item labeled "5" is ____
a. a vascular bundle
b. spongy mesophyll
c. epidermis
d. a stoma
e. palisade mesophyll
ANSWER: a
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Genes that turn off or decrease the rate of cell division are known as ____________________ genes
Fill in the blank(s) with correct word
Eutrophication is
a. the enrichment of a body of water with nutrients. b. the acidification of a body of water with leaves of a hardwood tree. c. the turning of water during winter months in lakes. d. the algal production of toxins to kill fish. e. none of these.
A population size will remain stable if
A) the birth and death rates are equal, as are the rates of emigration and immigration. B) the number of births each year is constant and the birth rate is higher than the death rate. C) the rate of emigration is higher than the rate of immigration. D) environmental resistance declines each year. E) the population grows by a fixed percentage of its size each year.
Which of the following statements correctly describe(s) T tubules and their role in conducting action potentials in muscle cells?
A. T tubules carry action potentials into the interior of the muscle cell via voltage-gated Na+ and K+ channels. B. T tubules lack the voltage-gated Na+ and K+ channels that are present in the plasma membrane. C. T tubules are infoldings of the plasma membrane that encircle the myofibrils and are in contact with the sarcoplasmic reticulum. D. Without T tubules, the muscle cell would not be able to contract. E. T tubules are extensions of the sarcoplasmic reticulum that are in contact with the plasma membrane. F. T tubules have receptor proteins that bind neurotransmitters released from the synaptic terminal of the motor neuron.