The oxygen released into the air as a product of photosynthesis comes from
A) water.
B) glucose.
C) carbon dioxide.
D) chlorophyll.
Answer: A
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Which of the following is correct about the DNA molecules that result from DNA replication?
a. one DNA molecule has both parent strands; the other DNA molecule has two new strands. b. both DNA molecules have two new strands each; the parent strands are discarded. c. one DNA molecule has a parent strand and a new strand; the other DNA molecule has two new strands d. both DNA molecules have one new strand and one old strand e. the bottom parts of each new DNA molecule are new strands and the top parts of each new DNA molecule are old strands
Analysis of the genome and transcriptome of the highly radiation resistant bacterium Deinococcus radiodurans has revealed all of the following EXCEPT ________.
A. it has more DNA repair genes than E. coli B. genes whose products are involved in cell wall metabolism and cellular transport are dramatically up-regulated after irradiation C. its genome consists of two circular chromosomes and two plasmids D. genes whose products are involved in DNA replication and recombination are dramatically up-regulated after irradiation
Where would you find the double-stranded HIV DNA in an infected cell?
A) Incorporated directly into the host cell's chromosome B) As a separate plasmid in the host cell's nucleus C) In a vesicle in the cytoplasm D) There is no HIV form of DNA. It exists only as RNA, which makes viral proteins directly.
Immunity acquired by transplacental transfer is called __________.
A) artificially acquired active immunity B) artificially acquired passive immunity C) naturally acquired passive immunity D) naturally acquired active immunity