Which of the following is an indirect method for estimating the number of microbes in a sample?
A. viable plate counts
B. turbidity
C. Coulter counter
D. MPN
E. membrane filtration
Answer: B
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Chloe has the scaly skin condition icthyosis, which is X-linked recessive. Which of the following is most likely true?
A) Her mother and father were both unaffected carriers. B) Her mother was affected and her father was unaffected. C) Her father was a carrier. D) Her mother was a carrier and her father was affected.
A prokaryote’s cell shape is reinforced by
a. phospholipids. b. DNA. c. protein filaments. d. transport proteins. e. ribosomes
The different seasons of the year are due to the
A. tilt of Earth's axis as it travels around the sun. B. distance from Earth to the sun. C. rotation of Earth on its axis. D. rotation of the moon around Earth. E. gravitational pull of the moon as it travels around Earth.
Your job is to classify a newly discovered animal species. Your initial studies reveal that your specimen has tissues but lacks organs; has no head, body cavity, or segmentation; and has radial symmetry. To what phylum does this animal belong?
A) Cnidaria B) Mollusca C) Annelida D) Platyhelminthes E) Porifera