Which of the following is true of purines?
A) Cytosine is a purine.
B) Adenine's bonding to thymine is stronger than is guanine's to cytosine.
C) Purines have a double-ringed structure.
D) Both adenine and thymine are purines.
E) Purines bind readily to deoxyribose but not to ribose.
Answer: C
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Arsenic poisoning can lead to organ failure and death. Though arsenic can inhibit or interfere with a number of cellular enzymes, arsenic poisoning is thought to be mainly due to indirect inhibition of enzymes involved in both pyruvate oxidation and the Krebs cycle. As a result, this compound must be able to enter which cellular compartment?
A. The cytoplasm B. The nucleus C. The intermembrane space of the mitochondria D. The mitochondrial matrix E. The endoplasmic reticulum Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about pyruvate oxidation and the Krebs cycle? What other information is related to the question? Choose Answer Do you have all necessary information to determine where arsenic poisoning would have its greatest impact within the cell?
Which of the following is NOT formed during the Krebs cycle?
A.) CO2 B.) FADH2 C.) NADH D.) H2O
Which of the following is not one of the phases of mitosis?
a. Prophase b. S phase c. Metaphase d. Anaphase
Deforestation increases the productivity of land
Indicate whether the statement is true or false