Choose the evidence supporting that snakes evolved from legged lizards. Check all that apply.
A. The oldest snake-like fossils have leg bones.
B. Transitional fossils show sections of the snake backbone evolving into legs.
C. Snake embryos temporarily develop limb buds which are reabsorbed before birth.
D. Snakes have pelvic bones.
Answer: D
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Which one of the following steps comes first in sequencing?
A. breaking the DNA into small fragments B. putting the sequences in the correct order C. matching regions of overlap D. making copies of the DNA E. reconstructing the long sequence of nucleotides
What types of data can be used to construct phylogenies such as the one above?
A. molecular data B. fossil evidence C. anatomical, physiological and developmental studies of extant species D. molecular data, fossil evidence and anatomical, physiological and developmental studies of extant species E. None of the answers given above are correct.
How are processed mRNAs exported from the nucleus to the cytoplasm?
a. Eukaryotic transcription mechanically ejects mRNA from the nucleus. b. After the 5’ cap is added, it migrates to the cytoplasm by diffusion. c. After the poly-A tail is added, it binds to a protein for transport. d. mRNA is released into the cytoplasm when the nuclear envelope dissolves.
If a microbiology lab student left the safranin out of the Gram stain procedure, what would be the result?
A) All cells would be purple. B) Gram-positive cells would be purple and Gram-negative cells would be colorless. C) All cells would be pink. D) Gram-positive cells would be pink and Gram-negative cells would be purple. E) Gram-positive cells would be colorless and Gram-negative cells would be pink.