Which annelid structure resembles the ancestral
structure from which the vertebrate kidney evolved?
a. trachea
b. nephridium
c. mantle
d. parapods
e. all of these
Answer: b
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Water potential is especially important when considering the plant's need for:
A. fertilizers B. vitamins C. water D. osmotic adjustment E. dissolved solutes
In the context of biodiversity, genetic diversity consists of
A. all the alleles and transcription factors within a species B. the amount of genetic variation that occurs within and between populations C. the amount of genetic variation that occurs in an individual D. the amount of genetic variation that occurs between species E. the amount of genetic variation that occurs within and between species
Allele frequencies are always expressed as numbers between
1.2 and 4. 2.1 and 2. 3.3 and 5. 4.1 and 10. 5.0 and 1.
Why are modern light microscopes better than the ones Leeuwenhoek used?
A) Modern microscopes have a fivefold better resolution. B) Modern microscopes are compound instead of simple. C) Modern microscopes have lenses with smaller numerical apertures. D) Modern lenses are made of prisms. E) Modern microscopes are compound and have fivefold better resolution.