The ionic bond of sodium chloride is formed as a result of:
A) sodium giving up a proton to chlorine.
B) both sodium and chlorine losing electrons.
C) sodium gaining an electron from chlorine.
D) sodium giving up an electron to chlorine.
E) sodium and chlorine sharing electrons.
Answer: D
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Which of the following statements explains why all of the F1 females from a cross between a red-eyed homozygous female and a white-eyed male are heterozygous?
A. The male parent provides them with a white-eye allele on the X and a red-eye allele on the Y. B. The male parent provides them with a white-eye allele on the X, and the female parent provides them with a red-eye allele on the Y. C. The male parent provides them with a white-eye allele on the X, and the female parent provides them with a red-eye allele on the X. D. The female parent provides two X chromosomes to each daughter who both carry the red-eye allele. E. None of the answer options is correct.
Which component of a reflex arc sends messages from the central nervous system to an effector muscle?
a. motor neutron b. sensory neuron c. interneuron d. cerebral cortex e. cerebellum
All of the following were likely present on the primitive Earth during the evolution of self replicating molecules EXCEPT
A. amino acids and nucleotides B. nitrogen C. simple carbohydrates D. freestanding liquid water E. an O2 rich atmosphere
When two hydrogen atoms share electrons, what is the result?
A) A stable H2 molecule is formed. B) The nuclei repel each other and destabilize the molecule. C) An H2 molecule is formed, which is highly likely to bond with other atoms. D) One of the hydrogen atoms is stable, whereas the other remains unstable. E) A positively charged H2 molecule is formed.