Regarding the order Rhizobiales of the class Alphaproteobacteria, which genus includes human pathogens?
a. Agrobacterium
b. Bradyrhizobium
c. Beijerinckia
d. Brucella
Answer: d. Brucella
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Which disease CANNOT be prevented via the use of a vaccine generated from an attenuated pathogen?
A) malaria B) measles C) mumps D) rubella
Which of the following is the specialized junction between neurons where signals pass between them?
a. node of Ravier b. axon hillock c. synapse d. dendrite
What gives structure to a sponge?
a. Asconoids b. Spicules c. Pinacocytes d. Choanocytes
Seed packets give a recommended planting depth for the enclosed seeds. The most likely reason some seeds are to be covered with only -inch of soil is that the _____
A) seedlings do not have an etiolation response B) seeds require light to germinate C) seeds require a higher temperature to germinate D) seeds are very sensitive to waterlogging