Which protist structure serves as a flexible coat of armor?
a. Pellicle
b. Cilia
c. Flagella
d. Pseudopodia
a. Pellicle
Pellicle serves as a flexible coat of armor.
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True or False: The bright colored patterns of a flower's petals act as signals to an insect that nectar and pollen are available, and in this way the sender manipulates the behavior of the receiver
A. true B. false
The Mitchison and Kirschner ________ model of how microtubules transition between periods of growth and catastrophe proposes that ________ bound to ?-tubulin subunits at a microtubule plus end stabilizes the end and promotes growth,
but if the rate of hydrolysis to ________ exceeds the rate of tubulin addition, the end becomes unstable and loses subunits. Fill in the blank with correct word.
In an experimental situation, a student researcher inserts an mRNA molecule into a eukaryotic cell after he has removed its 5' cap and poly-A tail. Which of the following would you expect him to find?
A. The molecule is digested by restriction enzymes in the nucleus. B. The molecule is digested by exonucleases since it is no longer protected at the 5' end. C. The molecule attaches to a ribosome and is translated, but more slowly. D. The cell recognizes the absence of the tail and polyadenylates the mRNA. E. The mRNA could not exit the nucleus to be transcribed.
In pea plants, round peas are dominant (R) and shriveled peas are recessive (r), and yellow peas (shown as light gray in the Punnett square) are dominant (Y) and green peas (dark gray) are recessive (y). Using this information and the partial Punnett square shown, what is the phenotypic ratio of the offspring pea plants in this Punnett square?
A) 12:1:1:4 B) 9:3:3:1 C) 3:3:1:1 D) 1:1:1:1