Eventually scientists will find fossil remains that link all groups of organisms in fine detail.
a. true
b. false
Ans: b. false
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Through studies of insect Malpighian tubules, researchers found that K+ accumulated on the inner face of the tubule, against its concentration gradient. What can you infer about the mechanism of transport?
A) Potassium transport is a passive process. B) Movement of potassium into the lumen of the Malpighian tubules is an energy-requiring process. C) Potassium moves out of the tubules at a faster rate than it moves into the lumen of the tubules. D) Sodium ions will follow potassium ions.
In birds and butterflies, males contain ____ sex chromosomes and females contain ____ sex chromosomes
a. XY; XX b. ZZ; ZW c. ZY; XW
d. XX; XY e. ZW; ZZ
Endocytosis and exocytosis move large molecules or particles across the membrane using ____________________. Fill in the blank(s) with the appropriate word(s)
In the model of a bacteriorhodopsin, which pigment is bound to the protein?
a. rhodopsin b. retinal c. chlorophyll a d. indigo