What proportion of the solar radiation that reaches Earth's surface is visible light?
A) A small fraction is visible light.
B) Most of the radiation is absorbed by rocks on Earth's crust.
C) About half is visible light.
D) It is captured by plants and used in photosynthesis.
E) About 90% of it is visible light.
C
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During a stressful interval, _____
A) thyroid-stimulating hormaon (TSH) stimulates the adrenal cortex and medulla to secrete acetylcholine B) the alpha cells of islets secrete insulin and simultaneously the beta cells of the islets secrete glucagon C) adrenocorticotropic hormone (ACTH) stimulates the adrenal cortex, and neurons of the sympathetic nervous system stimulate the adrenal medulla D) the posterior pituitary gland secretes more growth hormones E) the calcium levels in the blood are increased due to actions of two antagonistic hormones, epinephrine and norepinephrine
Which of the following insulates the electrical signal from dissipating?
a. Glial cells b. Myelin sheath c. Axons d. Synapse
Why are most X-linked disorders recessive?
a. X-linked dominant disorders are always fatal to females b. females only have one active X- dominant disorders would render them sterile c. dominant X-linked disorders are almost always fatal to the male embryo d. dominant X-linked disorders, regardless of their overall effect, prevent proper sperm formation e. more than one of these is the reason why most X-linked disorders are fatal
Members of the class ________, which include octopuses, squids, and nautiluses, are highly intelligent.
What will be an ideal response?