Which of the following is not a characteristic of deuterostomes?
a. the blastopore becomes the anus
b. determinate cleavage
c. they include echinoderms and chordates
d. indeterminate cleavage
e. three embryonic germ layers
Ans: b. determinate cleavage
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Which of the following is/are a habitat island?
A. a freshwater pond in a meadow B. a black basalt lava flow in the middle of the desert C. an individual cluster of pines in the middle of a pine forest D. a freshwater pond in a meadow and a black basalt lava flow in the middle of the desert E. a freshwater pond in a meadow, a black basalt lava flow in the middle of the desert, and an individual cluster of pines in the middle of a pine forest
What is the site of nitrogen fixation in legumes?
a. mycorrhizae b. root nodules c. phloem d. the cortex e. the pith
What happens first in DNA replication?
a. the DNA molecule unwinds b. DNA polymerase brings new nucleotides to the old DNA strand c. DNA ligase activity begins d. hydrogen bonds are broken e. none of these things happen first
The first law of thermodynamics states that every energy transfer involves a loss of usable energy (the so-called "heat tax").
a. true b. false