The invention of which instrument was most critical to the field of microbiology?
transfer loop
Petri dish
microscope
centrifuge
microscope
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The basic living unit of all living organisms is called:
a. tissue. b. germ plasma. c. cells. d. organs. e. DNA.
Which began first?
A. Multicellular life in the ocean B. Animals colonizing the land C. Multicellular life in fresh water D. Plants colonizing the land
The embryonic nervous systems of peanut worms (Sipuncula) and spoon worms (Echiura) show that these worms ________
A) are descended from segmented ancestors B) have appendages that are homologous with arthropod appendages C) do not express Hox genes during development D) are similar to each other because of homoplasy E) are surprisingly closely related to vertebrates
What is the Hardy-Weinberg equation?
a) an assessment of evolution at a particular locus b) a determination of allele frequency c) a determination of genotype frequency d) an assessment of heterozygosity in a population