The fossil record indicates that the first vascular plants possessed roots
A. true
B. false
B
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Describe the signal transduction pathway that is activated when LPS binds to TLR-4
What will be an ideal response?
Boiling water (100°C) can normally destroy endospores.
Answer the following statement true (T) or false (F)
When homologous chromosomes cross over, what occurs?
A) Two chromatids get tangled, resulting in one re-sequencing its DNA. B) Two sister chromatids exchange identical pieces of DNA. C) Corresponding segments of non-sister chromatids are exchanged. D) Maternal alleles are "corrected" to be like paternal alleles and vice versa.
Organisms such as the Antarctic fish can swim at extremely low temperatures. Which mechanism best describes how they do this?
a. They modify their proteins to be more flexible. b. They modify their proteins to be more rigid. c. They do not use proteins. d. They warm their bodies through metabolism. e. They live in a frozen state. f. I don't know the answer