What level of protein structure is associated with the folding of coils and sheets to form a hollow region through
which substances can move into and out of cells?
a. primary
b. secondary
c. tertiary
d. quaternary
e. binary
ANSWER: c
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After microRNAs are transcribed, processed, and folded into stem-and-loop hairpin structures, specialized enzymes cleave the miRNAs to double-stranded fragments that are typically around 20-25 nucleotides long
A. true B. false
The last shared ancestor for today's cell types is thought to have arisen about _____ years ago.
A. 5 million B. 2 million C. 3 billion D. 4 billion E. 6 billion
Which of the following is NOT considered a peripheral lymphoid tissue?
A) bone marrow B) spleen C) appendix D) adenoids E) tonsils
Which statement helps to explain why ice is less dense than liquid water? (2)
What will be an ideal response?