The myoglobin protein, which carries oxygen in muscle cells, has only the first three levels of protein structure. What can you infer about myoglobin?
A. Myoglobin is made of nucleic acids
B. Myoglobin lacks hydrogen bonds
C. Myoglobin is made of only one polypeptide chain
D. Myoglobin is not helical or pleated
C
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Which of the following is not a modification to the mRNA before leaving the nucleus?
A. End capping B. Promoter binding C. Intron removal D. Exon splicing
Which of the following biomes is dominated by coniferous trees adapted to surviving long, harsh winters and short, wet summers?
A) tiaga B) tundra C) temperate broadleaf forest D) savanna E) chaparral
Which of the following is an example of mutualism?
a) a clown fish lives inside a sea anemone and is protected by it, while the anemone receives nothing from the clown fish b) a jaguar kills and consumes a gazelle c) a remora fish removes algae and parasites from a shark's skin and receives protection in return d) a wasp paralyzes a caterpillar and lays its egg inside it e) a female cuckoo lays its egg in the nest of a smaller bird, which then raises the cuckoo chick
All of the following are challenges in gene therapy EXCEPT ________
A) designing a strategy B) unknown cell types C) unknown specific mutations D) inaccessible tissues