Mesophyll cells are:a
arranged tightly together.
b. separated by intercellular spaces.
c. responsible for the opening and closing of stomata.
d. devoid of chloroplasts.
e. covered by a waxy cuticle, which they secrete.
B
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This photograph illustrates micropropagation, a form of artificial reproduction in plants. Which of these is unlikely to be an application for micropropagation?
a. preserving plants vulnerable to extinction
b. growing plants for experiments in labs
c. mass-producing grain for famine relief
d. breeding plants with pharmacological value
In the figure above, which number identifies the location where the Organ of Corti might be found?
a. 2 b. 4 c. 6 d. 8 e. 10
Graves disease is an autoimmune disorder in which a person's thyroid is stimulated to produce too much thyroxine
Indicate whether the statement is true or false
Which of the following might decrease the transcription of only one specific gene in a bacterial cell?
(a) a decrease in the amount of sigma factor (b) a decrease in the amount of RNA polymerase (c) a mutation that introduced a stop codon into the DNA that precedes the gene's coding sequence (d) a mutation that introduced extensive sequence changes into the DNA that precedes the gene's transcription start site