Which of the following causes the ribosome to attach to the rough endoplasmic reticulum?
A)An ER signal sequence is present in the protein being synthesized.
B)Sugar groups on the newly forming protein interact with pores on the ER surface.
C)Most ribosomes remain bound to the ER, they do not attach and detach from its surface.
D)Once enclosed in a transport vesicle, a ribosome complex enters a cistern of the ER.
A)An ER signal sequence is present in the protein being synthesized.
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Which of the following processes is NOT associated with gastrointestinal function?
A. Digestion B. Secretion C. Filtration D. Absorption E. Motility
If a human cell has 23 chromosomes, it likely just finished
A. meiosis. B. mitosis. C. osmosis. D. cytokinesis.
Consider the following list of commonly found items and their pH values:Battery acid (1.0), vinegar (2.2), grapes (3.5-4.5), tomato (4.0-4.5), beer (4.2), coffee (5.0), white bread (5.0-6.0), butter (6.1-6.4), egg whites (7.6-8.0), baking soda (8.3), milk of magnesia (10.6), bleach (12.8)Which of the following is closest to the pH of water?
A. Baking soda B. Grapes C. White bread D. Egg whites
Mutations in polypeptides called ________ that are produced by cytotoxic T cells could prevent T cells from destroying infected cells.
A. interferons B. antibodies C. histamines D. perforins