Which photoreceptor cell type is present at high concentration in the fovea?
A. amacrine cells
B. cone cells
C. bipolar cells
D. rod cells
B
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Why does the presence of telomeres protect the ends of linear chromosomes?
A. Telomere DNA is resistant to nuclease activity. B. The telomeres represent large "buffer zones" of DNA sequence that do not code for biomolecules. Loss of these sequences is easily tolerated. C. Every time somatic cells replicate, telomerase extends the ends of the chromosomes. D. Specialized telomere-binding proteins prevent loss of DNA during replication. E. None of these choices is correct.
Thaumarchaeota is ubiquitous in
a. the soil. b. the marine water column. c. both the soil and the marine water column. d. freshwater.
Which of the following is not true of the Chloroplastida (green algae)?
A. Their cell walls contain chitin. B. They are found in fresh and salt water. C. They store carbohydrates as starch. D. They have chlorophylls a and b.
Describe what constitutes a lichen. How do they obtain their nutrition? Where are they usually found in the rocky intertidal?
What will be an ideal response?