Which of the following groups includes both spiders and horseshoe crabs?

A) millipedes
B) crustaceans
C) chelicerates
D) insects


Answer: C

Biology & Microbiology

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What is the correct order of structures in the electrical excitation pathway that generates a normal heartbeat? 

Refer to the diagram below.


A. 1, 2, 3, 4, 5, 6
B. 3, 6, 2, 4, 1, 5
C. 6, 3, 2, 4, 5, 1
D. 1, 5, 4, 2, 3, 6
E. 2, 5, 1, 4, 6, 3
F. 3, 2, 6, 4, 5, 1

Biology & Microbiology

A pine tree is called a sporophyte because it

a. develops from a germinated spore. b. produces spores by meiosis. c. is haploid. d. undergoes fertilization. e. reproduces by both sexual and asexual means.

Biology & Microbiology

Total species diversity, or species richness, across all communities within a geographic area is referred to as ________ diversity

Fill in the blank(s) with correct word

Biology & Microbiology

A signal sequence at the N terminus of newly synthesized proteins will direct the protein to the ________ for protein packaging

Fill in the blank(s) with correct word

Biology & Microbiology