Phospholipids
1.have a polar head and two non-polar tails.
2.have a non-polar head and two polar tails.
3.are soluble in water.
4.are polymers of amino acids.
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Which group of fishes gave rise to the amphibians?
A. Cartilaginous fishes B. Lobe-finned fishes C. Jawless fishes D. Ray-finned fishes
Which statement is not true about the pentose phosphate pathway?
A) It allows cellular respiration to occur without the need for oxygen. B) It can be used in part by photosynthetic cells to build glucose from carbon dioxide. C) It produces the coenzyme NADPH needed for anabolic pathways. D) It diverts glucose-6-phosphate from glycolysis to synthesize 5-carbon sugars needed for nucleotides. E) It converts 5-carbon sugars into 3- and 6-carbon for use in glycolysis.
Which of the following statements best describes DNA polymerase?
A. It is an enzyme that catalyzes the addition of nucleotides to the 3? end of a growing DNA strand. B. It is an enzyme that polymerizes the DNA and keeps the replication fork open. C. It is an enzyme required to produce a primer needed for DNA replication. D. It is an enzyme that catalyzes the addition of nucleotides to the 5? end of a growing DNA strand. E. It is an enzyme required to glue pieces of DNA fragments together.
Which of the following statements is TRUE?
A. Synthesis of the lagging strand requires more DNA helicase enzymes than synthesis of the leading strand. B. The lagging strand is synthesized in a semiconservative fashion while the leading strand is synthesized in a conservative fashion. C. The leading strand is replicated continuously for the entire length of the chromosome, e.g. while the lagging strand has multiple origins of replication. D. The lagging strand has a higher mutation rate than the leading strand. E. None of the answers are true.