Excess salts of saltwater fish are excreted
a. by relatively large kidneys.
b. through the skin.
c. through the eyes.
d. through special salt glands located in the tail.
e. through the gills.
Answer: e
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Brittany and Jarod have been trying to have a second child for 10 years. They have one healthy child, but Brittany has had four early, spontaneous abortions. The most likely explanation for the many pregnancy losses is that Brittany and Jarod
A) are not having sex frequently enough. B) are each heterozygous for lethal alleles of the same gene. C) are each homozygous for lethal alleles of the same gene. D) have different alleles for all of their vital genes.
The process of ________ occurs when molecules move down a concentration gradient due to random molecular motion
Fill in the blank(s) with the appropriate word(s).
Which of the following is not true about the interaction of biofilms on teeth?
A) Brushing teeth twice daily and flossing will physically remove superficial plaque layers. B) Bacterial growth within deeper biofilm layers and new bacteria entering the mouth quickly reestablish what was removed from brushing. C) Limiting dietary fats reduces lactic acid production by the bacteria in dental plaque and decreases the risk for dental caries, D) When plaque calcifies into tartar it must be scraped off the teeth. E) Dentists recommend a twice-yearly dental cleaning and checkup to limit caries and periodontal disease,
Which portal of entry is the most commonly used by pathogens?
A. gastrointestinal B. urogenital C. skin D. respiratory E. They are all equally used as portals.