An organism that can eviscerate its internal organs when stressed is the:
a. sea star.
b. sea cucumber.
c. crinoid.
d. sea urchin.
e. brittle star.
B
You might also like to view...
Which of the following is a hormone produced by specialized cells in the heart in response to high
blood pressure?
a. atrial natriuretic factor b. renin c. aldosterone d. antidiuretic hormone e. angiotensin
Impressive was a champion Quarter Horse stallion with a magnificent muscular physique, a trait that he passed on to dozens of offspring. However, many of Impressive's offspring developed periodic muscular twitching that sometimes left the horses temporarily unable to move. Some horses even died. As it turns out, Impressive's award-winning physique was due to a mutation in a single, protein-encoding gene, resulting in hyperexcitable muscle (which contracts even in the absence of a stimulus from its motor neuron). Which is not a plausible explanation for the identity of the abnormal muscle protein in Impressive and his offspring?
A. Overactive troponin molecules B. Acetylcholine receptors that function in the absence of acetylcholine C. Tropomyosin that is unable to bind to actin D. Leaky Na+ channels E. Overactive Ca2+ pumps in the membrane of the sarcoplasmic reticulum
The theory of segregation
a. concerns alleles governing two different traits. b. applies only to linked genes. c. applies only to sex-linked genes. d. explains the behavior of a pair of alleles during meiosis. e. none of these.
Refer to the accompanying figure. The root of the tooth is made up of the parts labeled:a
4 and 5 only b. 3, 4, and 5 only c. 1, 2, and 3 only d. 1, 2, 3, and 4 only e. 1, 2, 3, 4, 5