In the DNA double helix, the two strands are joined by _____.
A) phosphate bonds
B) hydrogen bonds
C) covalent bonds
D) deoxyribose
Answer: B) hydrogen bonds
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The ability to determine where a sound is coming from depends primarily on
A. differences in sound intensity in the two ears. B. differences in time of sound arrival to the two ears. C. differences in sound frequency received at the two ears. D. differences in both frequency and intensity at the two ears. E. None of these choices are correct.
What type of neuron is responsible for carrying electrical signals AWAY from the CNS to elicit a response in the body?
A. sensory neuron B. motor neuron C. interneuron D. glial cell E. All of these choices are correct.
Answer the question using the accompanying figure. In the internal leaf structure, the item labeled "5" is ____
a. a vascular bundle b. spongy mesophyll c. epidermis d. a stoma e. palisade mesophyll
Since each child of two heterozygous parents has a 50% chance of receiving a recessive trait from each parent,
A. if the first child is phenotypically recessive, then the next child has a 1/2 chance of being phenotypically recessive. B. if the first child is phenotypically recessive, then the next child must be phenotypically dominant. C. if the first child is phenotypically recessive, then the next child has a 3/4 chance of being phenotypically recessive. D. no matter what the first child's phenotype, the next child will have a 1/4 chance of being phenotypically recessive.