Which of the following is an informational macromolecule?
A) DNA
B) ATP
C) starch
D) glycogen
E) polypeptide
Answer: A
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Hemophilia in humans results from an X linked recessive gene. Which of these statements regarding the inheritance of this trait is true?
A. Heterozygous females will exhibit a milder form of hemophilia. B. All daughters of an affected mother will have hemophilia. C. Carrier females will always pass the hemophilia allele to their sons. D. Males who inherit the recessive allele from their fathers will exhibit hemophilia. E. All sons of an affected mother will have hemophilia.
.____ were first discovered in experiments to define the nutrient media required for plant tissue culture
a. Gibberellins b. Cytokinins c. Salicylic acid d. Auxins e. Brassinosteroids
The teeth designated by the letter "D" in the above figure are called ____
a. canines b. premolars c. incisors d. molars e. wisdom teeth
Which of the following statements best explains why dominant alleles that cause lethal disorders are less common than recessive alleles that cause lethal disorders?
A) Lethal disorders caused by dominant alleles are usually more severe than lethal disorders caused by recessive alleles. B) Unlike lethal disorders caused by recessive alleles, lethal disorders caused by dominant alleles usually cause the death of the embryo. C) Most individuals carrying a lethal dominant allele have the disorder and die before they reproduce, whereas individuals carrying a lethal recessive allele are more likely to be healthy and reproduce. D) The presence of a lethal dominant allele causes sterility.