Sponges _____
A) have larvae which are motile and move via the motion of cilia
B) are the simplest diploblastic animals
C) have a nerve net but not a central nervous system
D) have feeding cells called dinoflagellates
A
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Free-living flatworms (planaria) move by using
(a) cilia. (b) flagella. (c) pseudopodia. (d) a muscular foot.
During normal DNA replication, part of the DNA at the ends of linear chromosomes is not copied into
the new DNA strands because
a. DNA ligase cannot join pieces at the end of a chromosome. b. RNA primers at the beginning of a new strand cannot be replaced with DNA. c. those ends are Okazaki fragments that are lost. d. cells do not need the DNA at the ends of chromosomes. e. the ends of chromosomes are made of protein, not DNA.
During DNA replication, complementary nucleotides are added to the separated strands of the original DNA by enzymes. Which one of the following bases would a nucleotide contain if it were paired to a nucleotide containing thymine?
A) adenine B) uracil C) another thymine D) cytosine E) guanine
If a couple was attempting to get pregnant, which foods should they eat to avoid ingesting high amounts of toxins?
A) High-fat salmon B) High-level carnivores such as tuna C) Meals microwaved in plastic bags D) Organic grains, fruits, and vegetables E) DDT-treated vegetables