An individual with a genetic makeup of aa BB is called
A. true-breeding.
B. recessive.
C. hybrid.
D. dihybrid.
E. heterozygous.
Answer: A
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In the simplified prairie food chain illustrated in the pictures below, the letter D represents ____
a. tertiary consumer b. secondary consumers c. first trophic level d. primary consumers e. third trophic level
For a science fair project, two students decided to repeat the Hershey and Chase experiment, with modifications. They decided to label the nitrogen of the DNA, rather than the phosphate
They reasoned that each nucleotide has only one phosphate and two to five nitrogens. Thus, labeling the nitrogens would provide a stronger signal than labeling the phosphates. Why won't this experiment work? A) There is no radioactive isotope of nitrogen. B) Radioactive nitrogen has a half-life of 100,000 years, and the material would be too dangerous for too long. C) Although there are more nitrogens in a nucleotide, labeled phosphates actually have sixteen extra neutrons; therefore, they are more radioactive. D) Amino acids (and thus proteins) also have nitrogen atoms; thus, the radioactivity would not distinguish between DNA and proteins.
Which hypothesis argues that the human races independently evolved from H. erectus in different parts of the world?
A. the Asian-African Hypothesis B. the Recently-Out-of-Africa Model C. the Multiregional Hypothesis D. the Local Hypothesis
Used to build complex organic compounds from simpler compounds; also known as biosynthetic reactions; chemical bonds are created; energy is required