Melanin absorbs UV radiation and can therefore protect against some forms of skin cancer. Which type of cells produce melanin?
A. melanocytes
B. chondrocytes
C. actinocytes
D. lymphocytes
E. osteocytes
A. melanocytes
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The concept that offspring can inherit the acquired skills of their parents is called
A. pangenesis. B. blending inheritance. C. particulate inheritance. D. Lamarck's hypothesis. E. blending inheritance or Lamarck's hypothesis.
The liverwort genus Marchantia can reproduce asexually by way of ____, small cell masses that form in cuplike
growths on a ____.
a. antheridia; gemmae b. gemmae; thallus c. archegonia; thallus d. thallus; gemmae
e. antheridia; thallusA diaphragm is a shallow, dome-shaped rubber disk with a flexible rim that fits within the vagina and covers the cervix. If it is used without a spermicide, how will it act as a contraceptive to prevent pregnancy?
A. It would prevent sperm from reaching the egg. B. It would prevent ovulation. C. It would cause the embryo to die. D. It would prevent implantation on the uterine wall. E. It would kill the sperm.
A sick person often has a fever, which can inhibit the growth of bacteria because
A) bacteria reproduce more rapidly at higher body temperature. B) enzymes do not function as well at temperatures other than the optimal temperature. C) the higher temperature increases the activity of lyases. D) sweating removes prosthetic groups from biological enzymes. E) fever blocks synthesis of proteins in the bacterial nucleus.