A hypothetical population has two alleles for a gene: A and a. In a random sample of 100 individuals, 20 are homozygous for a, 20 are homozygous for A, and 60 are heterozygous. What is the frequency of A?
A) 20%
B) 25%
C) 50%
D) 60%
E) 80%
C
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A student set up an experiment to test if plants give off water vapor. Fifty pea plants, growing in pots, were covered with individual glass containers and left overnight. The next morning, the inside of each lid was covered in droplets of water. The lab student concluded that plants generally give off water vapor. What critique would you make of the experimental design?
A. There was no control so the water could have come from other sources such as air in the jar or the soil. B. There was not a large enough sample of pea plants used to get adequate data. C. The student did not have a clearly stated hypothesis before beginning the experiment. D. The experiment was not precise, meaning it was not reproducible.
Courts allow patenting complementary DNA (cDNA) because
A) its exact sequence is not in the genome of an organism. B) it cannot be synthesized in a laboratory. C) it is present only in adult humans. D) it represents only the introns of a gene.
Most hormones produced in the anterior pituitary ____
a. affect kidney functioning b. are secreted in response to signals from the medulla oblongata c. control the release of hormones from other endocrine glands d. are steroid hormones e. effect target cells in the posterior pituitary
Which of these is NOT an evolutionary advantage of the first cell membranes?
A) Membranes allow cells to move independently. B) Membranes allow for cells to be compartmentalize. C) Membranes allow substances to be concentrated inside a cell, or pumped outside. D) Membranes allow genotypes and the phenotypes they produce to stay linked. E) All of the above are advantages of cell membranes.