Which statement(s) regarding endocrine glands is/are true?
a. lack ducts.
b. secrete hormones internally into the blood.
c. are derived from epithelial tissue.
d. include the parathyroids.
e. all of these answers.
E
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If an animal cell lacked centrioles, it would not be able to
A) move. B) synthesize proteins. C) produce DNA. D) metabolize sugars. E) divide.
The degeneration of oocytes prior to puberty is known as __
Fill in the blank(s) with the appropriate word(s).
In humans, the yolk sac ________
A) forms the human urinary bladder B) passes nutrients to the embryo after digesting the yolk mass C) is no longer a useful structure D) is the site of origin for blood cells and primordial germ cells
An area of the retina that contains only cones and is the site of sharpest vision is the
A) outer segment. B) inner segment. C) fovea centralis. D) optic disc. E) tapetum lucidum.