Why are population projection matrices so complicated?
A) because plant sizes are fixed over time
B) because larger populations require more sophistication
C) because fecundity is high in some species
D) because some species can move back and forth between life stages
D
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A purine or pyrimidine that is attached to a sugar, either ribose or deoxyribose, which is attached to one or more phosphate groups is called a ________.
A. nitrogenous base B. nucleic acid C. nucleoside D. nucleotide
After performing a Gram stain of a mixed culture of Gram-positive and Gram-negative cells, you
realize that you omitted the iodine step. What would you expect to see if you observed the slide under the microscope?
a. pink Gram-positive and purple Gram-negative cells b. purple Gram-positive and pink Gram-negative cells c. pink Gram-positive and pink Gram-negative cells d. colorless Gram-positive and pink Gram-negative cells e. colorless Gram-positive and colorless Gram-negative cells
A fourth type of restriction enzyme is identified that cleaves at precise locations like a type II enzyme, but it also occasionally makes mistakes and cuts elsewhere. Would this type of enzyme be a useful enzyme to use in molecular cloning?
A. Yes, because it cuts correctly sometimes. B. No, because cutting mistakes could lead to incorrect cloning. C. No, because it is a precise enzyme. D. Yes, because cutting mistakes don't matter in molecular cloning.
Which of the following statements is true?
A) Cnidarians have no true tissues and are filter feeders, while flatworms have true tissues and a gastrovascular cavity. B) Nematodes have no true tissues and are filter feeders, while chordates have true tissues and a gastrovascular cavity. C) Molluscs have no true tissues and are filter feeders, while cnidarians have true tissues and a gastrovascular cavity. D) Sponges have no true tissues and are filter feeders, while cnidarians have true tissues and a gastrovascular cavity.