Memory cells are involved in the _____ immune response.
A. secondary
B. primary
D. all of the above
Answer: A. secondary
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In this representation of transcription, strand # ____ is ____ because it ____
a. 2; RNA; is double-stranded b. 3; RNA; contains uracil c. 2; RNA; contains thymine d. 2; RNA; has no uracil e. 3; DNA; contains adenine
The difference between simple diffusion and facilitated diffusion is that facilitated diffusion
A) Can move materials from a higher to a lower concentration. B) Can move materials from a lower to a higher concentration. C) Requires ATP. D) Requires transporter proteins. E) Doesn't require ATP.
A "mini-gene" has the base sequence TACCCGTGCACG. Which of the following sequences represents a single base substitution?
A) TACCCGGCACG B) TACCCGTGCACG C) TACCCGAGCACG D) TACCGTGCTACG E) TACCCGTGTCACG
You find the frozen remains of a woolly mammoth in an Alaskan glacier. You analyze a bit of the tusk and find that its 14C:12C ratio is about one-fourth (25%) of the baseline level typically found in living organisms. Given that the half-life of 14C is
5,730 years, when did the mammoth die? A) 5,730 years ago B) about 12,000 years ago C) at least 25,000 years ago D) about 75,000 years ago