What path does a molecule of O2 take from the nose to the respiratory surface?
A) pharynx ? larynx ? trachea ? bronchus ? bronchiole ? alveolus
B) larynx ? pharynx ? trachea ? bronchus ? bronchiole ? alveolus
C) pharynx ? larynx ? bronchus ? bronchiole ? alveolus ? trachea
D) pharynx ? larynx ? trachea ? bronchiole ? bronchus ? alveolus
A
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Under what conditions does one expect a 1:1:1:1 ratio?
What will be an ideal response?
Answer the following statements true (T) or false (F)
1. A plant that is dioecious could also have perfect flowers. 2. A bilaterally symmetrical flower has only two equal parts. 3. Plants that are pollinated by insects probably do NOT produce allergy reaction in humans. 4. A dog that is conditioned to salivate in response to a stimulus associated with food will salivate in response to that stimulus even after the food is removed. 5. When body temperature drops below normal, a person starts shivering uncontrollably. This is an example of negative feedback.
Which of the following locations is the main reservoir for nitrogen in the nitrogen cycle?
A) atmosphere B) sedimentary bedrock C) fossilized plant and animal remains (coal, oil, and natural gas) D) plant and animal biomass E) soil
The presence of an antibiotic in the media where the bacteria are grown enables the selection of colonies grown from
(a) transformed cells. (b) nontransformed cells. (c) cells that have the gene for resistance to the antibiotic. (d) both a and c.