Which of the following might result in a human zygote with 45 chromosomes?
A) an error in either egg or sperm meiotic anaphase
B) failure of the egg nucleus to be fertilized by the sperm
C) failure of an egg to complete meiosis II
D) incomplete cytokinesis during spermatogenesis after meiosis I
Answer: A
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Sugar is used in the making of fermented sausages to
A. help preserve the sausage. B. provide raw material for the fermentation process. C. sweeten the taste. D. counteract the action of the salt in the sausage.
Reptiles can maintain their internal body temperature by
A. behavioral mechanisms. B. drinking warm or cool water. C. eating and oxidizing more food. D. an effective insulating covering. E. rerouting blood to distribute heat.
Which of the following is true of the structure
labeled “A”? a. It is composed of tubulin subunits. b. It is composed of actin subunits. c. It is a microtubule. d. It is an intermediate filament. e. It is a major component of muscle cells.
There are three alleles controlling the ABO blood types. IA and IB are codominant genes so that the combination IAIB produces the AB blood type. The third allele, i, is recessive to the other two alleles. Which of the following combinations of parents (with blood types on the left) and child (with blood type listed on the right) is NOT possible?
A. A ´ AB = B B. A ´ O = A C. A ´ B = O D. A ´ AB = O E. A ´ AB = B