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
Answer: B
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Match the following names with the correct statements.
_______1. This German scientist proposed the theory of biogenesis—that life can arise only from preexisting life. _______2. This Dutchman built single lens microscopes as a hobby and is believed to be the first person to see live bacteria and protozoa. _______3. This German physician developed a step-by-step scientific method to prove that a particular microorganism causes a particular disease and contributed to what is known as “the germ theory of disease.” _______4. This French scientist discovered that microorganisms are responsible for fermentations, contributed to disproving abiogenesis, and contributed to what is known as “the germ theory of disease.” a. Robert Koch b. Louis Pasteur c. Rudolf Virchow d. Antony van Leeuwenhoek
If part of a DNA template is the sequence GTTAGTCTGTGGGCT, then the mRNA transcribed from it is
A) GTTAGTCTGTGGGCT. B) CAATCAGACACCCGA. C) CAAUCAGACACCCGA. D) gln-ser-asp-thr-arg.
Sodium (Na), atomic number 11, has a tendency to lose an electron in the presence of chlorine. After losing the electron, Na has ________ protons in its nucleus
A) 11 B) 10 C) 22 D) 21 E) 12
The acrosome of sperm cells contains an enzyme called hyaluronidase. Which of the following procedures would benefit from the addition of hyaluronidase?
A) ligating two strands of DNA together B) helping a drug to pass through a cell membrane C) assisting with mitotic division of skin cells D) increasing levels of FSH released from the hypothalamus