The __________ are plants that made major contributions to the coal deposits formed hundreds of
millions of years ago.
a. hornworts and liverworts
b. horsetails and club mosses
c. angiosperms
d. whisk ferns and true mosses
e. lichens and true mosses
B
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Cytotoxic T cells destroy cancerous cells by
A. forming the membrane attack complex. B. releasing vesicles containing perforin. C. activating natural killer cells. D. opsonization. E. secreting cytokines.
Which of the following is INCORRECTLY paired?
a. pancreas ? insulin b. thyroid gland ? thyroxine c. hypothalamus ? melatonin d. adrenal cortex ? glucocorticoids e. posterior pituitary ? oxytocin
Ricin inactivates _____
a. proteins b. ribosomes c. DNA d. transcription factors e. mRNA
Which of the following is true of both starch and cellulose?
A) They can both be digested by humans. B) They are both structural components of the plant cell wall. C) They are geometric isomers of each other. D) They are both polymers of glucose. E) They are both used for energy storage in plants.