Which plants are characterized by a conducting system, the possession of cuticles, specialized stems, and roots, stomata, and, in many species, seeds?
A. Mosses
B. Horsetails
C. Tracheophyte
D. Liverworts
E. Club mosses
Answer: C
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A red blood cell has lost its nucleus to make more space for carrying oxygen. This is an example of ________
A) a prokaryotic cell B) a cell that is not living C) the relationship between structure and function D) a cell whose DNA is circular
Cell size is limited by _____
A) the number of proteins within the plasma membrane B) the surface area of mitochondria in the cytoplasm C) surface to volume ratios D) the size of the endomembrane system
Epinephrine ________
A) decreases metabolic rate B) decreases heart rate C) increases absorption of glucose by the digestive tract D) increases breathing rate
Thanks to a novel recessive mutation, a certain plant species has begun to invade colder Arctic regions outside of its normal range. However, this cold-tolerant mutation has not yet become fixed in the population. A second mutation arises that promotes self-pollination. Do you predict that the self-pollination allele will be selected for in the Arctic regions? Why or why not?
A. No. Plants that produce flowers must be cross-pollinated for proper seed development. B. Yes. The self-pollinated plant is more likely to maintain the cold-tolerant mutation, and plants in the Arctic are unlikely to be visited by pollinators. C. No. Outcrossing is always beneficial, since it enhances genetic diversity. D. Cannot make a prediction from the information given. It depends on whether the plant is normally insect-pollinated or wind-pollinated.