The most abundant protein on Earth is:
A. chlorophyll.
B. cellulose.
C. rubisco.
D. water.
E. keratin.
C
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When a neuron is at rest
a. there are more positively charged ions inside the axon than outside it. b. there are more negatively charged ions inside the axon than outside it. c. there are more negatively charged ions outside the axon than inside it. d. there are equal amounts of negatively charged ions outside the axon and inside it. e. there are more positively charged ions outside the axon than inside it.
Which two of the following statements are true regarding the human microbiome?
a. the human microbiota carries many more genes than the human genome b. healthy people harbor potentially dangerous pathogens, but these are in low abundance c. viruses present in healthy humans infect only the microbiota, not the human cells d. many sites of the human body are sterile, notably the lungs and brain.
Meselson and Stahl proved that
A. DNA contains nitrogen. B. DNA replicates in a semi-conservative manner. C. DNA is made from nucleotides. D. DNA is the genetic material.
Wings on insects, flowers on plants, and feathers on birds are all examples of variations of some pre-existing
structures, otherwise known as: a. preadaptations. b. allopolyploidy. c. paedomorphosis. d. allometric growth. e. punctuated equilibrium.