Plastids evolution began when an ancestral cell engulfed what?
a. a spirochete
b. a cyanobacteria
c. a mitochondria
d. green algae
b. a cyanobacteria
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Cystic fibrosis is autosomal recessive. This means that
A) both sexes can be affected and can "skip" generations through carriers. B) carrier mothers pass the mutation to some of their sons, but not to their daughters. C) each affected individual has at least one affected parent. D) both sexes are affected because new mutations occur frequently.
Which of the following scenarios is explained by adaptive radiation?
A. The toxicity level of the bark of a species of plant increases due to constantly being attacked by aphids. B. The color pattern of the moths living in the woods of England become darker as the levels of pollution increase during the Industrial Revolution. C. The average running speed of a cheetah increases each generation due to the gazelles getting faster. D. All of these are examples of adaptive radiation.
The formation of a peptide bond between two amino acids is an example of a(n) ______________reaction.
A) cleavage B) condensation C) group transfer D) isomerization E) oxidation reduction
The principal radiation interactions within the human body are assumed to be _____.
a) indirect effects b) direct effects c) DNA damage d) cell destruction