Modern botanists think that all plants evolved from a common ancestor that was an ancient green algae. What is the
best explanation for this hypothesis?
a. They are autotrophs.
b. They live on land.
c. They have green leaves.
d. They are green like green algae.
e. They share many biochemical and metabolic traits.
e
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In human cells such as muscle tissue, the product of anaerobic respiration is:
A. acetic acid. B. pyruvate. C. lactic acid. D. FADH2. E. ethanol.
Why does conjugation with an Hfr donor result in a much higher rate of gene transfer than conjugation with an F+ donor?
A) An F+ donor makes fewer pili. B) An F+ donor's T strand is slow to reach the pilus. C) The Hfr donor transfers genes from the chromosome and not the plasmid. D) The Hfr donor segment must undergo recombination in the recipient. E) The F+ donor segment must undergo recombination in the recipient.
A cell's G + C ratio is associated with which of the following classification methods?
A) phage typing B) biochemical tests C) physical characteristics D) analysis of nucleic acids E) serological tests
Answer the following questions true (T) or false (F)
1. Watson and Crick's experiments involved isolating DNA, generating X-ray diffraction images of the DNA, and building a model of its structure. 2. The structure of DNA allows the molecule to store information. 3. Base-pairing rules apply from one DNA strand to its partner, but not along the sugar-phosphate "handrails" of a DNA strand.