Which of the following elements is considered an essential macronutrient for plants?
a. zinc
b. uranium
c. iron
d. nickel
e. carbon
E
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Bacteria are grown in 15N (heavy) medium and then transferred to 14N (light) medium and allowed to replicate for 1 generation. The DNA is subsequently isolated and centrifuged in a CsCl2 gradient to yield what type of gradient band(s)?
A. one heavy band B. one light band C. one half-heavy (intermediate to heavy and light) band D. one heavy and one half-heavy band E. one heavy and one light band
The communication point between two
neurons is called the
a. electrical synapse. b. chemical synapse. c. neural junction. d. neural bridge. e. interneuron
Which of the following animals has a coelom?
a. flatworm b. earthworm c. human d. earthworms and flatworms e. humans and earthworms
Males with Klinefelter syndrome lack a Barr Body
_______________ Indicate whether the statement is true or false.