After isolating the rough endoplasmic reticulum from the rest of the cytoplasm, you purify the RNAs attached to it. Which of the following proteins do you expect the RNA from the rough endoplasmic reticulum to encode?
(a) soluble secreted proteins
(b) ER membrane proteins
(c) plasma membrane proteins
(d) all of the above
(d) The rough ER consists of ER membranes and polyribosomes that are in the process of translating and translocating proteins into the ER membrane and lumen. Thus, all proteins that end up in the lysosome, Golgi apparatus, or plasma membrane, or are secreted, will be encoded by the RNAs associated with the rough ER.
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Carbohydrates ____
a. act as energy sources for cells b. include fats and oils c. are made of nucleic acids d. act as protein builders e. are also called steroids
What is the hydrogen ion (H+) concentration of a solution of pH 8?
A) 8 M B) 8 x 10-6 M C) 10-8 M D) 10-6 M
A normal Arabidopsis flower is composed of four concentric whorls. Which of the following is the correct order of whorls, starting from the outside and moving in?
A. carpels-petals-sepals-stamens B. sepals-petals-stamens-carpels C. petals-sepals-carpels-stamens D. stamens-carpels-sepals-petals E. carpels-stamens-petals-sepals
Process, usually occurring within chloroplasts, that uses solar energy to reduce carbon dioxide to carbohydrate.
What will be an ideal response?