Correctly order the steps involved cellular immunity:
1. The Tc recognizes the infected host cell
2. The Tc interacts with epitope presented by MHC-I on the dendritic cell
3. The Tc secretes perforin and granzyme, causing apoptosis
4. The helper T cell activates the Tc cell
a. 2,1,3,4
b. 4,2,1,3
c. 2,4,1,3
d. 1,2,4,3
Ans: c. 2,4,1,3
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The result of double fertilization in an angiosperm is ____
a. two embryos b. an embryo and a megaspore c. an embryo and endosperm d. an embryo and a pollen grain e. an embryo and a female gametophyte
A hormone, neurotransmitter or paracrine messenger must first bind to a specific _____ on the target cell
Fill in the blank(s) with the appropriate word(s).
Experimenters replaced the statoliths in a crayfish statocyst with iron filings and then held a magnet above the animal. Based on your knowledge of the function of statoliths, what would they observe?
A. The crayfish stayed upright. B. The crayfish attempted to escape by rapidly swimming backwards. C. The crayfish turned upside down. D. The crayfish lay on its side. E. None of the answers are correct.
To calculate the total number of ATP produced per glucose molecule, consider that for each NADH + H+ formed inside the mitochondrion, ____ ATP are produced.
Fill in the blank(s) with the appropriate word(s).