Which of the following sampling techniques represents an index of abundance rather than an estimate of density?
A) number of oak trees within a quadrat
B) number of bear droppings along a trail
C) ratio of marked and unmarked mice in a field
D) number of ducks on a pond
B
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Which one of the following is LEAST likely to be a hotspot for birds?
A) Amazon River basin B) East Africa C) Southwest China D) Greenland
The notochord is most closely associated with the:
a. nervous system b. spinal cord c. skeletal system d. skin system e. nervous system and spinal cord only
Which of the following statements is NOT true of DNA methylation?
A. Methylation is permanent and cannot be reversed. B. It is associated with transcription repression. C. Cytosines on both strands are usually methylated. D. It occurs on cytosines adjacent to guanines. E. It is carried out by DNA methyltransferases.
These are straight filaments arising from the bacterial cell wall, making the bacterium look like porcupine
A. Capsules B. Endospores C. Fimbriaec D. Flagella