In animals, somatic cells are ________ and germ cells are __________
A. diploid ; diploid
B. diploid ; haploid
C. haploid ; diploid
D. haploid ; haploid
B
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In the reproductive cycle of a fern, a zygote develops into
a. sperm and egg. b. spores. c. a young gametophyte. d. a young sporophyte.
Give an example of a hydroskeleton and explain how it provides the support necessary for movement
What will be an ideal response?
Which of the following membrane activities requires energy from ATP?
A) facilitated diffusion of chloride ions across the membrane through a chloride channel B) movement of Na+ ions from a lower concentration in a mammalian cell to a higher concentration in the extracellular fluid C) movement of glucose molecules into a bacterial cell from a medium containing a higher concentration of glucose than inside the cell D) movement of carbon dioxide out of a paramecium
S. aureus has been isolated from George's infected wound. To satisfy Koch's postulates, what would George's doctor need to do with the isolated S. aureus?
a. Inject the S. aureus strain into an animal and see whether it develops the same type of infection that George has. b. Compare the DNA sequence of the strain of S. aureus isolated from George to other S. aureus strains to see whether it has been isolated from other similar infections. c. Inject the S. aureus into an animal, observe whether the animal gets an infection similar to George's, and isolate the same strain of S. aureus from the infection. d. Inject the S. aureus into an animal; if the animal develops the same infection, isolate the infectious material from the animal and test its ability to vaccinate another animal.