What argument do scientists who support the metabolism-first model use to dispute the replicator-first model?
A) RNA can only be used to make proteins, not other nucleic acids.
B) The replicator nucleic acid molecule would be too large and complex.
C) Replicators cannot exist without metabolism.
D) DNA cannot replicate without the help of proteins.
Answer: B
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A karyotype reveals the _____ of a single cell
a. base sequences b. chromosomes c. hereditary information d. clones
How do protostomes differ from deuterostomes?
a. Protostomes are diploblastic. b. Protostomes have radial symmetry. c. The first opening that develops in protostomes is the anus. d. Protostomes undergo spiral cleavage during development. e. Protostomes undergo indeterminate cleavage during development
Leukocyte esterase, an enzyme found in an active urinary system infection, is produced by
a) T lymphocytes. b) B lymphocytes. c) neutrophils. d) monocytes.
Why has the United States and Europe banned the use of human drugs in animal feeds?
A. Because it raises the price of the meat too high. B. Because it makes the animals grow too large. C. Because it causes infections in the cows and poultry fed them. D. Because it contributes to the growing drug resistance problem. E. All of these choices are correct.