The ____ is an extension of the upper body wall in mollusks.
A. radula
B. mantle
C. gill
D. lung
E. siphon
Answer: B
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A closed-circular DNA in its relaxed form has a linking number (Lk) of 500 . What will happen to the linking number of this molecule if DNA gyrase and ATP are added to this DNA?
A. Lk will increase. B. Lk will decrease. C. Lk will stay the same. D. Lk becomes undefined. E. None of these choices is correct.
Mendeleev found that when he arranged the known elements according to their atomic mass, the entries in the table exhibited a pattern of chemical properties that repeated itself in groups of eight elements. This led to the generalization now known as:
A. an atomic model. B. valance electrons. C. the periodic table. D. the octet rule.
The alleles an individual inherits are the
a. phenotype b. allelotype. c. homotype. d. heterotype. e. genotype.
What is different between two alleles of the same gene?
A) Their location. For example, one allele might be at the end of one chromosome, while the other allele is in the middle of another chromosome. B) The chromosome number they are on. For example, one allele might be on chromosome 12, while the other one is on chromosome 3. C) The information they carry. For example, one allele might carry the information for blue eye pigment, while the other carries the information for brown eye pigment. D) The cell they are in. For example, one might be in a liver cell, while the other is in a blood cell.