__________ are cells that synthesize bone, whereas __________ break down bone matrix.
Fill in the blank(s) with the appropriate word(s).
Osteoblasts; osteoclasts
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Biosafety Level 4 agents:
a. include those that are the common agents of infectious disease. b. require only standard good laboratory technique. c. include M. tuberculosis, M. gordonae, and Brucella. d. require the use of maximum containment facilities.
DNA transfer by conjugation is more efficient in a liquid medium setting, subjected to very mild agitation (stirring), rather than on an agar plate format. Why?
A. Direct cell-to-cell contact is required for this process, and this is more likely to be achieved in the plate format than in the fluid format (especially for relatively non-motile types of bacteria). B. Direct cell-to-cell contact isn't required for this process, so the ability to secrete the DNA into the surrounding fluid medium makes the process more efficient than the dry surface of an agar plate. C. Direct cell-to-cell contact is required for this process, and this is more likely to be achieved in the fluid liquid format than on an agar plate (especially for relatively non-motile types of bacteria). D. Trick question-it can take place with the same degree of efficiency on either format. It doesn't matter!
Explain how hagfish are still able to consume their dead or dying prey, even though hagfish lack jaws
What will be an ideal response?
Why might the sex ratio of bird species in the figure change from as they grow from juveniles to adults?
A) Nesting females are vulnerable to predatory attack. B) Males that are unable to mate die quickly. C) Females are less able to feed effectively as juveniles. D) More females are required to sustain the population.