A tunicate looks like a sponge. How could a biologist distinguish it from a member of the Porifera?
A. Unlike tunicates, sponges are symmetrical.
B. Tunicates have a stomach.
C. Tunicates do not filter feed.
D. Only tunicates produce gametes.
Answer: B
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Quality control is set up to determine the validity of cetrimide agar. Which two organisms should be used?
a. B. bronchiseptica and Cupriavidus pau-culus b. A. denitrificans and Alcaligenes faecalis c. Achromobacter piechaudii and B. bron-chiseptica d. Centers for Disease Control and Preven-tion (CDC) Alcaligenes-like group 1 and C. pauculus
The high diversity of pigeons in Papua New Guinea’s tropical rain forests is possible because:
1.They occupy very different niches, so have different forms.
2.Predation of one species by another has diversified their forms.
3.They are able to take advantage of the diversity of food-bearing trees in the forest.
4.They are symbiotic species so size difference does not matter.
What results when nitrogen dioxide and
hydrocarbons react in the presence of sunlight? a. photochemical smog b. industrial smog c. a thermal inversion d. depletions of the ozone layer e. any of these
Which of the following is CORRECT about bacterial ribosomes?
A. They have two subunits and contain three RNA molecules. B. They are a single complex without subunits, and contain three RNA molecules. C. They have three subunits each containing an RNA molecule. D. They have two subunits, the smaller one composed of protein only, and the larger one composed of RNA only. E. They are a single complex containing one large RNA molecules and several proteins.