In this sagittal view of the eye, what structure does number 3 indicate?
A. Cornea
B. Lens
C. Pupil
D. Ciliary body
E. Iris
B
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The fourth ventricle is in the
A. right cerebral hemisphere. B. brainstem. C. left cerebral hemisphere. D. midline of the brain, beneath the corpus callosum.
Cholesterol is a
A. carbohydrate. B. component of DNA. C. precursor of steroid hormones. D. vitamin. E. precursor of bile pigments.
A person normally has two alleles of a gene because
A. there isn't enough DNA to accommodate more than this. B. DNA only comes in two forms. C. one allele of a gene is carried on each of two homologous chromosomes. D. all genes come in only two varieties.
This figure shows spinal nerve branches. What structures are indicated by number 4?
A. Anterior rami B. Posterior rami C. Rami communicantes D. Sympathetic trunk ganglia E. Posterior root ganglia