Oysters generally settle at right angles to tidal currents. These currents:
a. carry food away from the oysters.
b. clear sediments from the oysters.
c. help them avoid oyster drills.
d. deposit sediments among the oysters.
B
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In a grasshopper, how does ion composition of pre-urine compare to hemolymph?
A) Pre-urine is significantly higher in osmolarity (especially with respect to Na+ and K+). B) Hemolymph is higher in osmolarity, conserving its Cl-. C) Pre-urine is similar to hemolymph in ion composition. D) The protein pumps and channels of the Malpighian tubules concentrate Cl- in the pre-urine.
For each statement, indicate whether it is True or False. If you choose False, briefly explain why the statement is incorrect. True or false. Organisms higher in a food web eat everything that is lower in the food web
What will be an ideal response?
The Reznick and Endler guppy study showed
that killifish and pike-cichlids raised in natural conditions will a. affect the age at first reproduction of the guppies that live with them. b. prey on guppies. c. affect the growth rate of guppies. d. affect the evolution of the guppies' life history traits. e. do all of these
To introduce a particular piece of DNA into an animal cell, such as that of a mouse, you would most likely be successful with which of the following methods?
A) electroporation followed by recombination B) introducing a plasmid into the cell C) infecting the mouse cell with a Ti plasmid D) transcription and translation