Which of the following plant cells has a
companion cell?
a. tracheids
b. vessel members
c. sieve-tube members
d. sclerids
e. fibers
C
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A researcher is setting up an experiment to measure basal metabolic rate in prairie voles (Microtus ochrogaster-a small rodent). Which of the following would be the best set of conditions for the voles immediately before and during the measurement?
A) House the animals in a cage with plenty of food and water to avoid stress; conduct measurements in a warmer room than the room where housed. B) House the animals in a cage with plenty of food and water to avoid stress; conduct measurements in a room the same temperature as the room where housed. C) House the animals in a cage with no food for a few hours before measurement; conduct measurements in a colder room than the room where housed, and exercise the voles. D) House the animals in a cage with no food for a few hours before measurement; conduct measurements in a room the same temperature as the room where housed.
Molecular phylogenies show all land plants are a monophyletic group. This suggests that _____
A) there were many different transitions from aquatic to terrestrial habitats B) wind-pollinated plants arose first C) land plants have undergone a diversification since they first colonized terrestrial habitats D) there was a single transition from aquatic to terrestrial habitats
The collagen fibers in bone are secreted by osteoblasts
____________________ Indicate whether the statement is true or false.
One advantage of a pedigree as a medical tool is that it is ________.
Fill in the blank(s) with the appropriate word(s).