Consider the metabolic repertoire of prokaryotes and the diverse environments in which they can thrive to answer the following questions. Only inorganic compounds like O2 or NO3 - may be used as terminal electron acceptors in respiration
A. true
B. false
B
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Notochords are found in
a. adult hemichordates (acorn worms). b. adult urochordates (tunicates). c. adult cephalochordates (lancelets). d. a and b only. e. b and c only.
In a dihybrid cross, if the resulting ratios are 1:1:1:1, what are the genotypes of the parents?
A. GgRr x ggrr B. GgRr x GgRr C. GGRR x ggrr D. GG x RR E. Gg x Rr
Which of the following calculations require that you utilize the addition rule?
A) Calculate the probability of black offspring from the cross AaBb × AaBb, where B is the symbol for black. B) Calculate the probability of children with both cystic fibrosis and polydactyly when parents are each heterozygous for both genes. C) Calculate the probability of each of four children having cystic fibrosis if the parents are both heterozygous. D) Calculate the probability of a child having either sickle-cell anemia or cystic fibrosis if parents are each heterozygous for both.
What percentage of Earth's productive land is currently used by the human population for crops and livestock?
A) 20% B) 75% C) 40% D) 55% E) 90%