A(n) ________ tree simply represents phylogenetic relationships but does not indicate which organisms are more primitive relative to others. In contrast, a(n) ________ tree gives a node that serves as the common ancestor and shows the development of the species from this origin.
Fill in the blank(s) with the appropriate word(s).
unrooted, rooted
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Which of the following cell types retains the ability to undergo cell division?
A) a sclereid B) a parenchyma cell near the root tip C) a functional sieve tube element D) a tracheid E) a stem fiber
The CRISPR-Cas system is exploited experimentally for ____
a. programmable RNA-guided genome editing b. programmable DNA-guided genome editing c. cutting DNA at specific sites so it can be inserted into a cloning vector d. increasing transcription of a gene of interest e. enhancing DNA polymerase activity in PCR reactions
In cases where a perpetual "arms race" occurs between biological antagonists, such as parasites and their hosts, sex is favored because it reduces linkage disequilibrium by recreating missing genotypes in an oscillating fashion
This hypothesis is called the ________ [two words] hypothesis. Fill in the blank(s) with correct word
The terminal pathway of the complement cascade encompasses C5, C6, C7, C8, and C9. It results in the formation of the Membrane Attack Complex.
a. true b. false