Rods exposed to light will _____
A) depolarize due to the opening of sodium channels
B) hyperpolarize due to the closing of sodium channels
C) depolarize due to the opening of potassium channels
D) hyperpolarize due to the closing of potassium channels
B
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The DNA sequence ATGCATGC will pair with which of the following RNA strands?
A. CGAUCGAU B. AUGCAUGC C. UACGUACG D. UAGCTAGC
Photosynthesis takes carbon from reservoirs in the atmosphere and uses it to form ________, the energy source for all animals on earth.
A. glucose B. carbon monoxide C. carbon dioxide D. water
Slime molds were once classified as fungi. What characteristics of the slime molds distinguish them from fungi?
A. The vegetative state of the slime mold is mobile and amoeboid. B. They are flagellated cells at certain stages of the life cycle. C. Slime molds lack cell walls. D. All of these characteristics distinguish slime molds from fungi.
A species that plays a critical role in maintaining the structure of an ecological community and helps to determine the types and numbers of various other species in the community is known as
A. a keystone species. B. the dominant species. C. a predator. D. the primary species. E. the alpha species.