Protists are classified into a single kingdom because of which of the following features?
A. They are microscopic.
B. They are eukaryotes, but not fungi, plants, or animals.
C. All types of nutritional modes are found.
D. They are unicellular.
E. They are monophyletic.
Answer: B
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Which of the following statements about excretory organs in complex multicellular animals is false?
A. Water and all other important molecules are actively transported back into the bloodstream during reabsorption. B. Selective filtration of the blood occurs as blood pressure forces materials into an extracellular space. C. During the process of secretion, additional toxic compounds and excess ions that were not filtered from the blood initially are removed from the organism. D. Reabsorption helps prevent the loss of necessary electrolytes and other important molecules. E. None of these statements about excretory organs in complex multicellular animals is false.
C. hyperpolarized, decreases Upon emerging from a darkened area like a movie theater during daylight, our eyes are initially extremely sensitive to light. This is because
A. our pupils are wide open and take some time to close. B. the proportion of our retinal in the cis- conformation is high. C. the proportion of our retinal in the trans- conformation is high. D. our rods and cones are already highly hyperpolarized from the previous dark conditions. E. All of the answers are correct.
Which one of the following biological polymers is mismatched with its monomer?
A) DNA - nucleotide B) enzyme - amino acid C) chitin - monosaccharide D) protein - amino acid E) cellulose - amino acid
Why is it a good strategy for a microbe to adhere to a receptor that plays a critical function for a host cell?
A. It ISN'T a good strategy-host cells could shift to a backup receptor and shut down production of the main receptor, preventing infection. B. If it's a receptor the cell MUST use, it doesn't have a backup system in place to switch to-so, even though it makes it susceptible to infection, it HAS to put that target out there. This benefits the microbe. C. Microbes need to evade detection and elimination by the immune system-if they adhere to a receptor that plays a critical function, they are less likely to trigger destructive immune responses. This would be similar to using a hostage as a shield in a police-standoff situation. D. It ISN'T a good strategy-by binding to receptors, microbes will be phagocytosed by cells and destroyed within them.