Adaptive immunity is also referred to as ____ immunity
a. acquired
b. innate
c. secondary
d. latent
e. hidden
ANSWER: a
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In biology lab, you are observing and dissecting flatworms. Their bodies are very thin, even see-through, and their thin body surface allows them to exchange gases of oxygen and carbon dioxide with the underlying cells and tissues. Flatworms lack which of the following anatomical systems?
A. nervous B. movement C. respiratory D. digestive E. excretion
The original published articles describing the structure of DNA were authored by _____ and _____
a. Crick; Franklin b. Watson and Crick; Franklin c. Wilkins; Franklin d. Wilkins; Watson and Crick e. Watson; Crick
Inside nitrogen-fixing nodules, one N2 molecule is converted into two
A. NH3. B. N. C. NO3. D. NO. E. NO2.
Can you hold your breath until you die?
A. Yes B. No