The secretion of each of the hormones from the anterior pituitary requires:
a. stimulation from the posterior pituitary
b. that they first be made in the neurons of the hypothalamus
c. neural stimulation from the hypothalamus
d. releasing hormones delivered from the hypothalamus via a capillary bed
e. changing levels of their hormones in the blood
d
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Goiters are often produced in the ____ , a gland that plays a key role in metabolism by secreting the thyroxine and triiodothyronine hormones
Fill in the blank with the appropriate word.
Microbes sometimes make metals such as mercury more volatile and lipid soluble by ________.
A. phosphorylation B. methylation C. aggregation D. None of the choices are correct.
As DNA replication proceeds the double helix ahead of the replication fork becomes highly coiled and twisted. The enzyme that uncoils the helix ahead of the replication fork is called?
a. helicase b. gyrase c. DNA polymerase d. primase
All of the following are true about Shiga toxins EXCEPT:
A. It is a holotoxin composed from one A subunit and five B subunits B. It is a preformed toxin composed from one A subunit and five B subunits C. Upon its activation, the B subunits bind to a host cell and facilitate transfer of the A subunit into the cell. The a subunit disrupt protein synthesis D. It is also produced by some pathogenic Escherichia coli