Which of the following plant growth responses is primarily due to the action of auxins?
A) leaf abscission
B) cell division
C) the detection of photoperiod
D) phototropism
D
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Proteins consist of
(a) monosaccharides linked in chains. (b) amino acid units. (c) polysaccharide units. (d) condensed fatty acids.
You find a unicellular organism that forms lobe-like pseudopodia. When you expose the cells to cAMP, they
aggregate into a slug like structure. Based on this information, you correctly conclude that this organism is known as: a. Chlamydomonas. b. Chaos carolinense. c. Entamoeba histolytica. d. Dictyostelium discoideum. e. Physarum polycephalum.
Which molecule has the shape of a completed tetrahedron?
a. Methane CH4 b. Water H2O c. Oxygen Gas O2 d. Hydrogen Gas H2
Which of the following physiological responses occurs in the human body when it becomes overheated?
A) slowing of the heart rate B) constriction of blood vessels in the skin C) increased blood flow to the skin D) retention of water