#Question id: 13120
#Unit 2. Cellular Organization
|
Target organelle |
Location of sequence within
protein |
Removal of sequence |
Nature of sequence |
|
1- ER |
i- N- terminal |
a- yes |
P- Core of 6-12 hydrophobic aa
often preceded by one or more basic ammo acids (Arg, Lys) |
|
2-Mtochrondria matrix |
ii- N- terminal |
b- yes |
Q- Multiple different kinds; rich in Lys and Arg residues |
|
3-Chloroplast stroma |
iii- N- terminal |
c- no |
R- Lys and arg one side and other
side hydrophobic aa |
|
4-Nucleus |
iv-varies |
d- yes |
S- Generally rich in ser and thr,
poor in glu and asp |
#Question id: 24166
#General Aptitude
#Question id: 12578
#Unit 10. Ecological Principles
Refer to the following experiment, which is designed to test the co evolutionary relationships among an unpalatable butterfly (the monarch), a palatable butterfly (the viceroy), and a butterfly predator (the jay). Monarch butterflies are reared on three diets: milkweed (their natural food), cabbage, and cabbage treated with an extract from milkweed leaves. Viceroy butterflies, mimics of monarchs, also are reared on three diets: willows (their natural food), cabbage, and cabbage treated with an extract from milkweed leaves. In trial 1 of the first experiment, adult butterflies reared on a particular diet are presented one at a time at 1-hour intervals to jays and the jays are allowed to feed. Each jay is fed until it refuses to eat the butterfly presented, but no more than 12 butterflies are presented to a jay during a particular test. Five birds are used for each test; therefore, up to 60 butterflies can be consumed for each diet test. The observer records the actual number of butterflies eaten. In trial 2, the experiment is repeated 2 weeks later. In the second experiment, the butterflies are reared on the same diets as in experiment 1. However, when they are offered to jays, some jays receive a monarch reared on milkweed before being offered the butterflies reared on the experimental diets; the other group of jays is first given a viceroy reared on willow before being offered the butterflies reared on the experimental diets. The initial butterfly offered is included in the total number eaten, but no more than 12 butterflies are presented to each jay
Which of the following supports the hypothesis that viceroys receive protection from predation because they resemble monarchs?
#Question id: 9153
#Unit 9. Diversity of Life Forms
Imagine some cosmic catastrophe jolts Earth so that its axis is perpendicular to the orbital plane between Earth and the sun. The most obvious effect of this change would be ________.
#Question id: 21240
#Unit 7. System Physiology – Animal