Why is photorespiration more likely in warm weather?
a. Plants require warm weather (at least 23?C) to drive photosynthesis.
b. Plants are more likely to close their stomata in the daytime heat than at night when it is
cool.
c. Plants are more likely to dehydrate in warm weather, forcing them to close the stomata to
conserve water; this prevents CO2 from entering the leaf.
d. The rubisco enzyme is very temperature sensitive and becomes less selective in warmer
temperatures, allowing it to fix O2 instead of CO2.
e. Plants use up the water in their central vacuoles in warm weather inhibiting the waterrequiring
light reactions; this in turn alters the activity of rubisco.
C
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Most viral respiratory diseases are highly contagious but not life threatening
Indicate whether the statement is true or false.
Natural sources of energy on the early Earth caused ____
a. spontaneous genetic mutations b. chemical bonds to break c. chemical bonds to form d. chemical bonds to break and form e. spontaneous genetic mutations and chemical bonds to break and form
Male animals that mate with and control more than one female at a time are called:
a. hermaphroditic. b. heterogenous. c. polygynous. d. androgynous. e. monogamous.
If three molecules of a fatty acid that has the formula C16H22O2 are joined to a molecule of glycerol (C3H8O3), then the resulting molecule would have the formula:
a. C48H96O6 b. C48H98O8 c. C51H68O6 d. C51H106O8 e. C51H104O9