At which point in a pregnancy can human chorionic gonadotropin be detected in the mother's blood?
a. at the time of fertilization
b. at the time of implantation
c. by the first week of pregnancy
d. by the third week of pregnancy
e. by the sixth week of pregnancy
D
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A common consequence of nutrient deficiencies in plants is chlorosis, which is ____
a. wilting due to a lack of chlorine in leaves b. death of the growing tips c. premature loss of leaves d. bursting of cells from excess water uptake due to an inability to clear chlorine from them e. yellowing of plant tissues due to a lack of chlorophyll
In the amniote egg diagram shown, the item labeled "1" is the
a. yolk sac. b. chorion. c. allantois. d. amnion. e. albumin.
The place where vibrations are translated into patterns of nerve impulses is the
a. pinna. b. ear canal. c. middle ear. d. organ of Corti. e. tympanum.
Where in a cell is ATP made?
a. chloroplasts b. ribosomes c. mitochondria d. nucleus e. lysosomes