At what point in development is a human embryo considered to be a fetus?
a. 2 weeks
b. 4 weeks
c. 8 weeks
d. 10 weeks
e. 12 weeks
C
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Anti-A and anti-B antibodies
A. are considered natural antibodies. B. are present at birth. C. are typically IgM. D. easily cross the placenta. E. are considered natural antibodies AND are typically IgM.
The sinoatrial node consists of a form of this tissue.
A. nervous B. muscular C. epithelial D. connective E. adipose
What does DNA sequencing suggest about the relationship between the nuclear and organellar genomes?
A) The same subset of mitochondrial genes has moved to the nuclear genome in all species. B) Mitochondrial genes that are found in the nuclear genome do not have introns, suggesting that movement occurred via an RNA intermediate. C) The mitochondrial and nuclear genomes are entirely independent of each other. D) Some cells have two types of mitochondria that have different genome sequences. E) Some proteins found in mitochondria are imported from the cytoplasm.
The changing of a business letter from shorthand to
typewritten copy is analogous to a. translation of mRNA. b. transcription of DNA. c. protein synthesis. d. deciphering the genetic code. e. replication of DNA.