Sulfur has an atomic number of 16. How many covalent bonds can sulfur form?
A) 1
B) 2
C) 4
D) 0
B
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Which of the following information led scientists to believe that archaeans belong to their own distinct
domain?
a. They have a cell wall synthesized from a unique carbohydrate. b. The genetic material of archaeans is RNA, not DNA. c. Many archaeans live in extreme environments tolerated by no other organisms. d. Archaeans do not utilize ATP to do cellular work. e. Archaeans have unique cellular structures not found in either eukaryotic or prokaryotic cells.
Which type of protist lives in the digestive tracts of termites and cockroaches playing a key role in cellulose digestion?
a. pathogenic plasmodia b. photosynthetic dinoflagellates c. anaerobic parabasalids d. enteric excavata
Bony fish usually do not need to adjust pupil size because:
a. their eyelids protect their eyes from bright light. b. the quantity of light is relatively low. c. they can move their lens forward and backward. d. a in conjunction with c
Some sensory receptors decrease their frequency of action potentials when exposed to a continued, constant stimulus in
a process known as: a. transduction. b. sensory adaptation. c. referred perception. d. reception. e. sensory summation.