During the process of transcription _____ is being turned into ______.
a. tRNA; DNA
b. rRNA; DNA
c. DNA; mRNA
d. DNA; tRNA
c. DNA; mRNA
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A type of gland that secretes an oily substance that softens and protects hair is a(n) _____ gland.
A. salivary B. mammary C. sweat D. sebaceous E. endocrine
The hearts of a fetal pig and a human are similar in that they are
a. the primary pump of the circulatory system of the body. b. both four chambered. c. composed of cardiac muscle tissue. d. all of the above.
The negative pressure gradient that contributes to the respiratory cycle ____
a. occurs only during expiration b. exists in the pleural cavity c. means that the inside of the lungs has a greater pressure than the pleural sac d. keeps the lungs separated from the chest wall e. is known as a pneumothorax
You may have observed plants rotate towards a light source, thereby increasing the plant's ability to intercept light energy and increase photosynthesis. You, however, are given the task of preventing grass seedlings from rotating toward the light. Using your knowledge of phototropism, which of the following experimental procedures would you use to complete your task?
A) Cover the growing tip of the grass seedling with black paper. B) Supply the seedlings with very dim light. (red light does not induce a bend) C) Cover the portion of the seedling below the tip with a black shield. D) Supply the seedling with nutrient-rich fertilizer solution.