Which of the following does not contain a gastrovascular cavity?

a. hydras
b. cnidarians


c. sponges
d. flatworms
e. jellyfish


c

Biology & Microbiology

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In science, the word "theory" ____

a. is an explanation that has not been published b. has essentially the same meaning as a prediction c. is based mostly on opinions d. signifies that a hypothesis has been tested and proven over a period of time e. means that a scientist has a hunch something is true

Biology & Microbiology

You decide to test the effects of Echinacea on 100 people who are experiencing similar cold symptoms. Which of the following groups would represent an appropriate control in your experiment?

A) One healthy person given Echinacea tablets B) One sick person given Echinacea tablets C) 100 healthy people given tablets similar to Echinacea but with no herb D) 100 sick people given tablets similar to Echinacea but with no herb

Biology & Microbiology

Membrane vesicles are used to transport material between cells as an alternative to protein secretion systems. Regardless of the nature of the bacterial envelope, all vesicles are produced by the same mechanism.

Answer the following statement true (T) or false (F)

Biology & Microbiology

To use the normal distribution to calculate the p-value of a hypothesis test involving the population mean, which assumption is not necessary?

A. The null hypothesis is zero. B. The sample is random. C. The sample is "large" enough (e.g., larger than 30). D. None of the answers is correct.

Biology & Microbiology