Serratia marcescens are red when incubated at 37?C
Indicate whether this statement is true or false.
FALSE
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Most fish deposit fertilized eggs, but some sharks keep the fertilized egg inside the female until she gives birth to a relatively well-developed pup. These sharks would thus be characterized as _____
A) live-bearing B) ovoviviparous C) oviparous D) viviparous
When leaves are actively transpiring at a high rate:
A. the risk of vessel collapse is reduced because the leaves exert a great deal of tensile force. B. the chance that an air bubble will form is decreased. C. the force created pulls vessel walls inward. D. air will only leak into a vessel if that vessel is broken or damaged. E. the chance of vessel collapse is reduced due to the high volume of water transport.
Vertebrate bone consists primarily of a crystalline mixture of which two substances?
A. Ca2+, PO4- B. Ca2+, SO4- C. Ca2+, Cl2 D. Na+, Cl- E. Adenosine, PO4-
Many flowering plants coevolve with specific pollinators. The Madagascar orchid has a 12-inch floral tube and is a reliable nectar source for the hawkmoth, which has a correspondingly long proboscis (tongue)
Which statement most accurately describes how coevolution might have occurred for the hawkmoth and Madagascar orchid shown here? A) The hawkmoths that expended the most effort to reach the nectar would be the most fit, and pass the longer tongue phenotype to their offspring. B) Natural selection would favor orchids with nectar tubes just long enough to for an insect with pollen to make contact. Hawkmoths whose tongue could reach the deep tubes would be more fit. C) Hawkmoths whose tongue was just long enough to obtain nectar, but not able to pick up pollen would become the most fit in the population. D) It is most likely that mutations that resulted in both the length of the orchid floral tube and the length of the hawkmoth tongue occurred abruptly and simultaneously.