Which statement about protists is true?

a. Protists conduct about one-fourth of the world’s photosynthesis.
b. Protists must be converted and cannot be consumed directly.
c. Protist pathogens harm plants but not humans.
d. Protists serve as primary producers on land.


a. Protists conduct about one-fourth of the world’s photosynthesis.

Biology & Microbiology

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Echinoderms are classified as Bilateria and they start out as bilateral larvae, yet as they develop they change into radially symmetrical adults. Would you expect their genes controlling the development of radial symmetry to be:

A. different from those controlling development of symmetry in all other radially symmetrical animals B. similar to genes controlling body form in Porifera C. similar to genes controlling body form in Ctenophora D. similar to genes controlling body form in the lophophorates E. similar to a common set of genes controlling body form in Ctenohora, and lophophorates

Biology & Microbiology

When an atom becomes an ion, which property changes the most?

a. atomic number b. atomic mass c. charge d. half-life

Biology & Microbiology

Consider the structure of a typical nerve cell. The nucleus is found in the ______ and the axon branches to form a number of ________

a. dendrites; cell bodies b. dendrites; synapses c. cell body; dendrites d. cell body; synapses e. axon; synapses

Biology & Microbiology

The carrying capacity of a given geographic region for a single population can change over time

Indicate whether the statement is true or false

Biology & Microbiology