Which phylum lacks true tissues?

a. Cnidarians
b. Porifera
c. Plathelminthes
d. Mollusca


Answer: b. Porifera

Biology & Microbiology

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The electrons that are passed to NADP+ during noncyclic pathways are emitted by::

a. photosystem I b. hydrogen ions c. glucose d. sunlight e. ATP synthase

Biology & Microbiology

Which of the following would be an expected long-term change during primary succession on glacial moraines? Check all that apply. 

_____ increase in species richness _____ decrease in soil depth _____ increase in soil salinity _____ increase in soil nitrogen _____ alder replaced by spruce

Biology & Microbiology

Some aquatic poikilotherms (e.g., sharks) are able to maintain a higher internal body temperature than the surrounding water

Indicate whether the statement is true or false

Biology & Microbiology

The process by which homologous chromosomes exchange genetic material

A. is crossing over. B. is random fertilization. C. occurs only in bacteria. D. occurs only in animals. E. is independent assortment.

Biology & Microbiology