The knee-jerk reflex used by physicians to check
nerve response is based on
a. muscle spindles.
b. stretch receptors.
c. spinal cord synapses.
d. muscle spindles and stretch receptors.
e. all of these.
Answer: e
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A. Kingdom. B. Phylum. C. Order. D. Genus. E. Species.
Eyelash length is an inherited trait. In the human population, there is an eyelash length gene. There are two possible variants of this gene - an allele for long eyelashes (> 1cm) and an allele for short eyelashes (1 cm or less). How many eyelash length alleles does an individual have in one of her/his somatic cells?
A. 46 B. 23 C. 2 D. 3 E. 1
Both Echinodermata and Chordata fall under the supergroup Deuterostomia. What primitive gut tube structure defines the Deuterostomes?
a. embryonic mesoderm b. enterocoelom c. archenteron d. blastocoel
Which of the following virus families has a double-stranded RNA genome?
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