How are the nucleotide monomers connected to form a polynucleotide?
a. hydrogen bonds between complementary nitrogenous base pairs.
b. ionic attractions between phosphate groups
c. disulfide bridges between cysteine amino acids.
d. covalent bonds between the sugar of one nucleotide and the phosphate of the next
e. ester linkages between the carboxyl group of one nucleotide and the hydroxyl group on the ribose of the next
Ans: d. covalent bonds between the sugar of one nucleotide and the phosphate of the next
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The actual transport of protons by the proton pump is mediated by a transmembrane protein which undergoes a change in its
A. conformation. B. amino acid sequence. C. net charge. D. solubility. E. immunity.
Where are complement proteins synthesized, and what do they do?
a. in the bone marrow, generate new platelets and T-cells b. in the kidneys and plasma, destroy intracellular pathogens c. in macrophages and the liver, destroy extracellular pathogens d. in the spleen and duodenum, generate macrocytes
Pasteur
A. employing a swan-neck flask. B. being the first researcher to work under sterile conditions. C. demonstrating the synthesis of organic molecules. D. showing that maggots arise from eggs laid by flies.
Chemicals produced by an individual that influence the behavior of members of the same species are called
A) hormones. B) pheromones. C) enzymes. D) steroids. E) stimuli.