Cell death genes act by
a. stimulating sonic hedgehog.
b. activating caspases.
c. producing nerve growth factor.
d. inhibiting caspases.
Question 2
Isaac observed a sample of motor units in which single neurons innervated fibers of the same type. This led Isaac to conclude that
a. neural input probably determines the identity of muscle fibers as slow or fast-twitch.
b. the organism that supplied the samples had probably suffered a spinal cord injury.
c. the organism that supplied the samples was very old.
d. his sample was not representative, and he needed to obtain more samples before reaching a conclusion.
Red Blood Cell
cell
Ten Leading Causes of Death in Low-Income Countries, 2008
Imaging cell surface glycoproteins in living cells
Analysis of double-mutant phenotypes to find order of genes in developmental pathways
The relationship between recombination frequency and physical distance between genes