Cells of the outer surface of a sponge obtain
nutrients by
a. absorbing food that diffuses from the
central cavity.
b. capturing food in their microvilli.
c. absorbing food distributed by amoeboid
cells.
d. phagocytosing bacteria and other small
food items.
e. poisoning small fish that contact them.
C
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What will be an ideal response?
Which of the following statements is true?
a. The hydrogen bonding of cytosine to guanine is an example of complementary base pairing. b. In DNA, adenine always base pairs with guanine, and cytosine always base pairs with thymine. c. Each of the four nucleotides in a DNA molecule has the same nitrogen-containing base. d. When adenine base pairs with thymine, they are linked by three hydrogen bonds. e. None of these statements are true
A scientist conducts a procedure that causes nitrogen atoms to gain neutrons. The resulting atoms will be:
A. new elements with higher atomic numbers. B. negatively charged. C. ions of nitrogen. D. positively charged. E. isotopes of nitrogen.
The function of the ________ is sperm storage and maturation in males
Fill in the blank(s) with correct word