Which of the following is an example of an "executioner" enzyme in the cell?
a. caspases
b. cytokinin
c. kinase
d. roscovitine
Answer: a. caspases
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Select all of the following that are bryozoans and brachiophytes characteristics.
_____ tentacles that are useful in breathing and feeding. _____ U-shaped digestive tract. _____ lack a coelom. _____ parthenogenesis.
What condition triggers apoptosis in immature T-cells?
a. premature exposure to viral pathogens b. sufficiently high T-cell concentrations c. T-cell receptors binding to “self” proteins d. insufficient levels of ATP phosphorylation
The structure labeled 2 in Figure 51-1 is the:a
endoderm layer. b. mesoderm layer. c. blastopore. d. blastocoel. e. archenteron
The term ________ is used to describe moving oxygen-rich air into the lungs and carbon dioxide-laden air away from the lungs
Fill in the blank(s) with correct word