Within interphase, which stage is defined by the active replication of the cell's genetic material?
A) Gap 1
B) replication
C) DNA synthesis
D) Gap 2
E) mitotic phase
C) DNA synthesis
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Circular DNA molecules found in nature (such as bacterial, viral, or mitochondrial DNA) are
A) positively supercoiled. B) negatively supercoiled. C) not supercoiled, due to their small size. D) always oriented in a triple helix to conserve space. E) always in the relaxed state.
Choose the membrane molecule responsible for aiding passage of polar molecules into and out of the cell.
A. cell surface proteins B. transmembrane proteins C. carbohydrate chains D. phospholipids
Deoxyribonucleotides and ribonucleotides differ in all of the following except
A) ribonucleotides can serve as energy molecules while deoxyribonucleotides do not. B) deoxyribonucleotides are found in DNA while ribonucleotides are found in RNA. C) the sugar is different in the two types of nucleotides. D) phosphodiester bonds can only form between deoxyribonucleotides, not ribonucleotides. E) the nitrogenous base thymine is only found in deoxyribonucleotides while the nitrogenous base uracil is only found in ribonucleotides.
Chloroplasts differ from mitochondria in that the former have
A. DNA. B. two lipid bilayers. C. 70S ribosomes. D. thylakoids. E. cristae.