Radioactive isotopes
A) are frequently added to foods as nutritional supplements.
B) can be used in conjunction with PET scans to diagnose diseases.
C) do not occur naturally.
D) are never incorporated into organic compounds.
Answer: B
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If the progeny of a mating of pea plants have the following ratios 1342 smooth seed/green pod, 447 wrinkled seed/yellow pod, 429 smooth seed/ yellow pod, 1361 wrinkled seed/green pod what are the genotypes of the parents?
A. Parent 1: Homozygous for seed shape and pod colorParent 2: Heterozygous for seed shape and homozygous for pod color B. Both parents are heterozygous for seed shape and pod color C. Parent 1: Heterozygous for seed shape and pod colorParent 2: Homozygous seed shape and heterozygous for pod color D. Parent 1: Heterozygous for both seed shape and pod color Parent 2: Homozygous for both seed shape and pod color
Plant cells ________
A) do not need chloroplasts because their mitochondria meet their energy needs B) have chloroplasts and mitochondria C) use carbon dioxide but do not use oxygen D) do not need mitochondria because their chloroplasts meet their energy needs
Replication of DNA begins at a(n)
A. guanine-adenine rich area. B. uracil-adenine rich area. C. adenine-cytosine rich area. D. adenine-thymine rich area. E. guanine-cytosine rich area.
What term describes avoidance of reproduction without giving up sexual intercourse?
A. Contraception B. The rhythm method C. Abstinence D. Asexual reproduction