Hormones as a general class are chemicals produced by the endocrine system that
A) control embryonic development.
B) regulate a variety of body functions, such as metabolism.
C) are stimulated by the action of metabolic enzymes.
D) travel by specific pathways to specific target cells.
Answer: B
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Answer the following statements true (T) or false (F)
1. Plant cell membranes contain cholesterol. 2. Membrane proteins are attached to or embedded in the phospholipid bilayer. 3. The presence of integral proteins allows membranes to be selectively permeable to certain molecules. 4. Freeze fracture electron microscopy allows one to observe the two-dimensional cross section of membrane proteins.
Penicillin is effective against bacterial infections because it interferes with the construction of
new __________ in the bacteria.
a. DNA b. cell walls c. endoplasmic reticulum d. mitochondria
The poly(A) tail of an mRNA ____
a. is where the start codon is located b. covers the stop codon until it is needed c. protects the mRNA from attack by RNA-digesting enzymes d. is where ribosomes attach at the start of translation e. is where translation terminates
The sterilizing gas used in chemiclaves is ________.
A. ethylene oxide B. iodophor C. chlorine dioxide D. formaldehyde E. glutaraldehyde