Which of the following best describes mollusks?
A) They have radial body symmetry and a soft body always covered with a shell.
B) They are bilaterally symmetrical and have a soft body always covered with a shell.
C) They have radial body symmetry and a soft body sometimes covered with a shell.
D) They are bilaterally symmetrical and have a soft body sometimes covered with a shell.
D
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G. lamblia infection in the gut ____; therefore, some people may be benefited by the presence of this protist
a. reduces the risk of parasitic worm infection b. increases the likelihood of getting irritable bowel disease (IBD) c. inhibits fat uptake from food d. causes no ill effect e. increases the risk of rheumatoid arthritis
Matching. Choose the best matching element
1. ___ anticodon 2. ___ McClintock 3. ___ codon 4. ___ messenger RNA 5. ___ polysome 6. ___ promoters 7. ___ transcription 8. ___ translation A. RNA-directed synthesis of polypeptide chains B. sites at which RNA polymerases can bind and initiate transcription C. binds to small subunit platform of a ribosome D. guided and catalyzed by RNA polymerases E. polypeptide chain elongation proceeds independently at each body in this cluster F. discovered transposons G. a tRNA triplet opposite a codon H. a set of three nucleotides
ID50 describes
A) the number of cells or virions needed to establish an infection in 50 percent of exposed hosts. B) the amount of toxin lethal to a 50-pound human or other animal. C) the number of cells or virions which will kill 50 individuals. D) the number of cells or virions which will kill 50% of exposed hosts. E) the percentage of individuals which will develop an infection after exposure to 50 cells or virions.
Which of the following statements comparing the naked mole rat social system with social insect societies are true? (Check all that apply.)A) As with social insect societies, colony members are kin.B) As with social insect societies, it is based on haplodiploidy.C) As with social insect societies, there is a division of labor within the colony.D) As with social insect societies, there is one queen and several reproductive males per colony.E) Unlike social insect societies, all colony members are diploid.
What will be an ideal response?