Flukes are divided into the groups Monogenea and Digenea. Monogenea have a posterior holdfast with hooks, clamps, and suckers, while Digenea have suckers but never hooks and clamps. Monogenea have only one host in the life cycle and usually live on gills or skin of fish and amphibians. Digenea have at least two hosts, and are named for having two reproductive states in their life cycle (an adult and intramolluscan phase).Based on this information, the blood fluke Schistosoma would be classified as
A. an endoparasite and Monogenean.
B. an ectoparasite and Monogenean.
C. an endoparasite and Digenean.
D. an ectoparasite and Digenean.
Answer: C
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Over the past several decades, populations of Staphylococcus aureus (a type of bacteria that infects wounds) have become resistant to penicillin. You run the following experiment:
As mentioned above, resistance to penicillin is a different biological mechanism than resistance to antibiotic X. What is the probable origin of antibiotic X resistance in these cells? A. The cells probably developed resistance to antibiotic X by undergoing mutation when exposed to the drug, and thus survived the exposure. B. A small percentage of the cells had preexisting mutations that confer resistance to antibiotic X. These cells survived exposure to the drug. C. Either of the other two options could be correct because both happen often in nature. More information is needed to answer the question.
Inside its beak an octopus has a rasping tongue that is used to tear apart food. Which gastropod structure is this analogous to?
A. Mantle B. Shell C. Radula D. Nephridium Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about mollusk feeding? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
A man and woman are each heterozygous for the autosomal recessive gene for albinism. They already
have two non-albino children and want to have two more. What is the probability that their next two children will be phenotypically identical to each other with regard to skin color (i.e., either both albino or neither albino)?
a. 1/16 b. 3/16 c. 4/16 d. 9/16 e. 10/16
It’s finally time to harvest your crop of carrots, turnips, and beets. You’ve been dreaming about roasted vegetables for months, so you grab your gardening gloves and trowel, and head out to your garden. What type of roots are carrots, turnips, and beets?
a. fibrous b. adventitious c. tap d. epiphytic