Which type of molecule forms the cell membrane and assists in regulating the movement of materials into and out of a cell?
A) lipids
B) proteins
C) nucleic acids
D) carbohydrates
Ans: A) lipids
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During DNA cloning, why is the DNA of interest inserted into the middle of the lacZ+ coding sequence in the plasmid
vector?
a. It makes the bacteria resistant to the antibiotic. b. It allows researchers to distinguish bacteria that contain the plasmid from those that do not. c. It aids scientists in developing new antibiotic treatments. d. It allows researchers to distinguish bacteria that contain the recombinant plasmid from those that contain just the vector. e. It makes the bacteria produce more clones.
The key difference between incomplete dominance and codominance is
a. with incomplete dominance, the recessive allele cannot be detected; in codominance, the expression of the recessive allele is apparent. b. with incomplete dominance it is possible to detect the expression of a recessive allele; in codominance, both alleles contribute equally to the phenotype. c. with codominance it is possible to detect the expression of a recessive allele; in incomplete dominance, both alleles contribute equally to the phenotype. d. with incomplete dominance, it is possible to detect the expression of the dominant allele; in codominance, both alleles contribute equally to the phenotype. e. the two terms mean the same thing.
The process by which a molecule splits into two smaller ones is
a. condensation. b. cleavage. c. functional group transfer. d. electron transfer. e. rearrangement.
Vitamins A and E are commonly produced by microorganisms
Indicate whether the statement is true or false