________ are the proteins that appear as dark bands that mark the ends of the sarcomeres

Fill in the blank(s) with correct word


Z lines

Biology & Microbiology

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Phosphofructokinase is an allosteric enzyme that catalyzes the conversion of fructose 6-phosphate to fructose 1,6-bisphosphate, an early step of glycolysis. In the presence of oxygen, an increase in the amount of ATP in a cell would be expected to _____

A) inhibit the enzyme and thus slow the rates of glycolysis and the citric acid cycle. B) activate the enzyme and thus slow the rates of glycolysis and the citric acid cycle. C) inhibit the enzyme and thus increase the rates of glycolysis and the citric acid cycle. D) activate the enzyme and thus increase the rates of glycolysis and the citric acid cycle. E) inhibit the enzyme and thus increase the rate of glycolysis and the concentration of citrate.

Biology & Microbiology

The DNA of an organism is studied and found to contain 14% guanine. This organism should have

____% thymine and ____% cytosine in its DNA.

a. 86; 14 b. 14; 36 c. 36; 36 d. 14; 86 e. 36; 14

Biology & Microbiology

The structural support of xylem is mainly due to the presence of a compression and decay-resistant tough polymer known as

a. sporopollenin b. chitin c. cellulose d. lignin e. restin

Biology & Microbiology

What is hemoglobin?

A. A reliable source of oxygen B. A protein that is colorless when deoxygenated C. An iron-containing respiratory protein D. A protein found in invertebrates such as crabs and octopus E. A by-product of gas exchange

Biology & Microbiology