Radioactive isotopes are used in dating materials from the distant past. Which of the following statements about radioactive dating techniques is true?
A. It does not work well with fossil remains that have not absorbed radiation.
B. It uses a technique in which the degree of radioactive decay is measured; the younger the rock the more radioactive decay.
C. It gives exact ages of rock strata. (±1 year).
D. It gives the general ages of rock strata. (±1 million years).
E. It uses a technique in which the degree of radioactive decay is measured; the older the rock the more radioactive decay.
Answer: E
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What mechanism explains evolution by discussing variations in a population that allow it to match its environment?
a. Artificial selection b. Origin of species c. Beneficial adaptations d. Natural selection
Evidence that all living cells have a common origin is provided by:
a. the cell theory, which states that the cell is the basic unit of life. b. the fact that all new cells come from previously existing cells. c. the fact that cells are the building blocks of the most complex plants. d. basic similarities in cell structure and chemistry. e. the fact that cells are the smallest units that can carry out all life activities.
A lacOc mutant would
A) never express lac structural genes. B) constitutively express the lac structural genes. C) not bind to lacI. D) use glucose before using lactose as a carbon and energy source. E) not bind to lacI and never express lac structural genes.
The first task you are assigned in your summer laboratory job is to prepare a concentrated NaOH stock solution. The molecular weight of NaOH is 40
How many grams of solid NaOH will you need to weigh out to obtain a 500 mL solution that has a concentration of 10 M? (a) 800 g (b) 200 g (c) 400 g (d) 160 g