Biochemistry
1. Which statement(s) about the synthesis of urea is (are) true?
a) Arginine is the precursor to urea.
b) Birds directly excrete NH4+ in their bird
“droppings”.
c) Only vertebrates make the enzyme arginase.
d) a and c
e) a, b and c
2. How are nucleotides synthesized in most organisms?
a) denovo synthesis of nucleotide bases
b) salvage synthesis of nucleotide bases
c) probono synthesis from common precursors
d) a and b
e) a, b and c
Both question have answer E
If you like the solution hit thumb's up. If any query please comment
Biochemistry 1. Which statement(s) about the synthesis of urea is (are) true? a) Arginine is the...
DNA, Genes and Protein Synthesis Activity 13: Protein Synthesis is the process by which cells produce (synthesize) proteins. An overview of the process is shown in model 2 (below). Gone 2 Gene 1 Gene 3 DNA strand3 TRANSLATION Protein Trp Gly Model 2 ACTIVITY and QUESTIONS 1. Based on the information you can gather from model 1 complete the following sentences: a. The nucleotide Adenine (A) always pairs with the nucleotide b. The nucleotide Guanine (G) always pairs with the...
7. Which statement is TRUE of glycogen synthesis and breakdown?---->the answer is A but I need it explained to me. a. Phosphorylation activates the enzyme responsible for breakdown, and inactivates the synthetic enzyme. b. Synthesis is catalyzed by the same enzyme that catalyzes breakdown. c. The glycogen molecule "grows" at its reducing end. d. The immediate product of glycogen breakdown is free glucose. e. Under normal circumstances, glycogen synthesis and glycogen breakdown occur simultaneously and at high rates.
14. Which of the following statements is true of lipids? A) Many contain fatty acids in ester or amide linkage. B) Most are simply polymers of isoprene C) Testosterone is an important sphingolipid found in myelin. D) They are more soluble in water than in chloroform. E) They play only passive roles as energy-storage molecules. 15. The sigma factor of E. coli RNA polymerase: A) associates with the promoter before binding core enzyme. B) combines with the core enzyme to...
36. Which statement is true about Nucleic Acids? a) DNA is a protein b) DNA is identical to RNA C) RNA has the structure of a double helix, d) RNA binds to DNA but not to amino acids. e) None of these are true. 37. Which is true for DNA, RNA and Polypeptides? a) They all have R groups, b) They are formed from ribose by dehydration synthesis. c) They all have subunits that include nitrogenous bases. d) They were...
1. Which of the following is / are TRUE regarding a DNA molecule? a) A SINGLE DNA molecule consists of 2 nucleotide chains b) Covalent, phosphodiester bonds connect the nucleotides of a single nucleotide chain together c) Phosphodiester bonds join the separate nucleotide chains to one another forming a single molecule d) Hydrogen bonds join the separate nucleotide chains to one another forming a single molecule 2. During DNA replication, the enzyme helicase: a) Unwinds the double helix b) Functions...
42. Which statement is NOT true about DNA? a) DNA acts like an enzyme by binding amino acids together using dehydration synthesis. b) Before cells divide both strands must be copied and one is provided for each new cell cm RNA is copied from a piece of DNA termed a gene. d) DNA is not always copied perfectly. Mistakes, mutations, occur and result in changed proteins, e) DNA functions as code for the synthesis of proteins. 43. A section of...
Choose the repair mechanism that is best associated with the statement. Some statements may have more than one answer. a. nucleotide excision repair b. mismatch repair c. translesion synthesis d. recombinational repair e. base excision repair _____ 1. Uses an enzyme called the DNA-N-glycosylases. _____ 2. Utilizes a group of proteins called Mut. _____ 3. The disease Xeroderma pigmentosum is caused by a defect in this system. _____ 4. This is associated with the SOS response in bacteria. _____ 5....
Please help with 4-10!
DNA, Genes,and Protein Synthesis Activity 13: 2. The bases that interact with each other are called complementary bases. this definition and your answers to 1 complete the following: a. Thiamine (T) is the complementary base of b. Cytosine (C) is the complementary base of c. Adenine (A) is the complementary base of d. Guanine (G) is the complementary base of Based on 3. Shown below is the nucleotide sequence for one strand of a stretch of...
12) Which statement is NOT true? A) There are many different types of lipids. B) Lipids are found in cell membranes. C) Some hormones are lipids. D) Lipids are soluble in organic solvents. E) All lipids contain fatty acids. 13) The process of building up new molecules in the coll is called A) glycolysis. B) catabolism. C) anabolism. D) metabolism. E) transamination 14) Which of the following does not require energy from ATP hydrolysis? A) digestion B) synthesis of an...
questions 25,62,54,77
25. At the end of Meiosis I, which best describes the chromosomes in the cells? A) DNA replication in the S phase has led to a doubling in chromosome number. B) The cells contain the haploid number of chromosomes. C) Chromosome number and structure are identical to the beginning of the S phase. D) The cells contain the diploid number of chromosomes. E)The chromosome number remains the same,but the DNA content is half the original cel. g påtterns...