Which molecules are essential components of tight junctions?
A. cadherins and connexins
B. cadherins and integrins
C. claudins and integrins
D. cadherins and claudins
E. connexins and claudins
E. connexins and claudins
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The specific chemical compound that is acted on by an enzyme is called a(n) ____________________
Fill in the blank(s) with correct word
As a naturalist, you are responsible for training volunteers in the identification of the types of amphibians. The volunteers will use this information to correctly describe the animals to school groups that will visit your nature center. The training documentation for the volunteers lists important characteristics of the different groups of amphibian, but you notice that one of the items on the list is incorrect. Indicate which description is not correct.
A. Frogs and toads have external fertilization whereas salamanders and caecilians have internal fertilization. B. Frogs, toads, and most salamanders have four legs whereas caecilians are legless. C. Frogs and toads lay eggs whereas some caecilians lay eggs and others give birth to live young. D. Salamanders and caecilians have external tails whereas frogs and toads do not. E. Adult frogs, toads, and salamanders are predators of insects and other small animals whereas caecilians are herbivores.
Variant Creutzfeldt-Jakob disease is caused by errors in ____
a. DNA replication b. translation c. transcription d. protein folding e. RNA template replication
Which of the following pairs does NOT apply to Chagas' disease?
A) causative agent — Trypanosoma cruzi B) vector — kissing bug C) reservoir — rodents D) diagnosis of acute phase — serological tests for antibodies E) treatment — nifurtimox