Lizards and snakes are living members of the ____ lineage
a. Testudines
b. Archosauria
c. Squamata
d. Sphenodontida
e. Amphibia
ANSWER: c
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The test tube in the photograph contains water at the bottom and another substance that has been stained with Sudan IV at the top. What is the macromolecular composition of this stained substance?
What will be an ideal response?
How do primary producers provide energy for the food chain?
A. They break down organic molecules into inorganic elements. B. They make their own organic molecules via photo- or chemosynthesis. C. They receive energy from secondary consumers. D. They pass on organic substances from primary consumers.
A dendritic cell with an antigen displayed on its surface is called a(n) ____
a. cytotoxic T cell b. plasma cell c. antigen presenting cell d. major histocompatibility complex e. CD4+ T cell
When Streptococcus pneumoniae are exposed to an antibiotic, the bacteria try to pump the antibiotic out of their cells. Which of the following mechanisms is most likely used by the Streptococcus pneumoniae to pump the antibiotic out of their cells?
A. active transport B. diffusion C. facilitated diffusion D. osmosis