RBCs are better known as ________ and WBCs are better known as ________.
A. macrophages; neutrophils
B. lymphocytes; monocytes
C. leukocytes; erythrocytes
D. erythrocytes; eosinophils
E. erythrocytes; leukocytes
Answer: E
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A researcher proposes that the relationship between a particular bacterial species that produces a fat-soluble vitamin is mutualistic with its insect host. Which of the following procedures would best test the researcher's hypothesis?
A. Design a method to isolate the bacteria from the insect, then mutate the bacteria in the region of DNA that controls vitamin production and compare growth of the mutant and wild-type bacteria on minimal media B. Extract the DNA from the bacteria and from the insect, then use reverse-transcriptase PCR and primers specific to the gene that controls vitamin synthesis to compare transcription of RNA in both organisms C. Determine which insecticide kills the insect without harming the bacterial host, then compare vitamin production by the bacteria from insects treated with the insecticide to those from untreated insects D. Determine which antibiotic kills the bacteria without harming the host, then administer this antibiotic to the insect and compare its growth with and without the vitamin
Anabolic steroids:a
are removed from the body fairly quickly due to a low concentration of receptor sites. b. decrease HDL concentration, thereby increasing the risk of cardiovascular disease. c. are naturally produced hormones typically used by athletes for short-term performance enhancement. d. have little or no effect on physiology or behavior at very low doses. e. are metabolized and excreted from the body quickly..
Fruit flies all look more or less alike. If you have a male and female fruit fly, how could you test the hypothesis that they're the same species?
A) Determine the sequence of several of their genes. B) Examine them closely under a microscope, and compare what you see to a published description of fruit flies. C) See if they'll mate when they're put together. D) See if they mate and if their offspring can also mate.
Gene duplications in Bacillus subtilis have resulted in a large gene family that encodes ________ transporters.
What will be an ideal response?