Which of the following would decrease body temperature?
a. dilation of cutaneous blood vessels
b. shivering
c. enhanced thyroxine release
d. eating a large meal
a. dilation of cutaneous blood vessels
When blood vessels in the skin dilate, heat from blood in the skin is more likely to dissipate into the environment. This
would lead to cooling of the body.
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Which of the following statements does NOT describe characteristics of heterospory?
A. Heterospory involves production of spores on two different parts of the same plant. B. Heterospory involves production of two different kinds of spores, one growing into male gametophytes and the other into female gametophytes. C. Heterospory increases the chance of cross-fertilization. D. Heterospory increases the potential for genetic variation and aids evolutionary flexibility. E. Heterospory only occurs in vascular plants.
Diagnosis of viral infections sometimes involves analyzing the patient's blood for specific ________ that the immune system produces against the virus.
A. glycoproteins B. complement proteins C. antigens D. antibodies
The gene for red-green color vision is on the x-chromosome. Color blindness is caused by a recessive allele. A normal woman (X^N X^N) marries a color-blind man (X^n Y). What fraction of their children will be color-blind?
a. 0/4 b. 1/4 c. 2/4 d. 3/4
You examine your nutrient gelatin tubes and find that the gelatin has been liquified. This indicates the prescence of _____.
Fill in the blank(s) with the appropriate word(s).