Which vitamin could build up to dangerous levels within the body?
A) vitamin B12
B) vitamin C
C) vitamin D
D) folic acid
C
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Scientists have found that polypeptides that are normally synthesized in the endoplasmic reticulum are about 20 amino acids longer when they are synthesized by ribosomes not attached to the endoplasmic reticulum
What is a possible explanation for the greater length of these polypeptides? A) Ribosomes attached to the endoplasmic reticulum require fewer amino acids to function. B) The 20 amino acids serve as a signal (peptide) sequence that directs the forming polypeptides to the endoplasmic reticulum, where they are cleaved off during processing. C) The 20-amino-acid sequence helps the endoplasmic reticulum package these proteins for shipping to the Golgi. D) The protein has a different function in the cytosol than in the endoplasmic reticulum.
________ causes 15 - 20% of all human deaths in developed countries
a. Heart disease b. Strokes c. Cancer d. Car accidents e. Diabetes
Substrate-level phosphorylation ____
a. occurs during glycolysis b. requires the presence of oxygen c. is a precursor for the phosphorylation of glucose d. is the source for the majority of the ATP produced in aerobic respiration e. occurs in the mitochondria
The rocks and weather that influence succession are examples of ________ factors
Fill in the blank(s) with correct word