Some protozoans have special organelles called contractile vacuoles that continually eliminate excess water from the cell. The presence of these organelles tells you that the environment
A) is isotonic to the protozoan.
B) is hypotonic to the protozoan.
C) contains a higher concentration of solutes than the protozoan.
D) is hypertonic to the protozoan.
Answer: B
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The two types of transposable elements are DNA transposable elements (DNA TEs) and long terminal repeats (LTRs)
A. true B. false
Atoms in which the number of electrons does not equal the number of protons are known as:
A. valences. B. ions. C. isotopes. D. isomers.
A vertebrate paleontologist is hunting through chalk deposits and finds a set of fused clavicles with some other bone fragments. What has she found?
A. The remains of an amphibian. B. The remains of a mammal. C. The remains of a lobe-finned fish. D. The remains of a bird.
Answer the following questions true (T) or false (F)
1. Homeobox sequences vary widely from one species to another. 2. Versions of homeobox genes have been found in plants and fungi. 3. Without cell adhesion, the primitive gut probably wouldn't develop during gastrulation.