Myosin and actin are the major contractile proteins in _______ muscle.
A. cardia
B. smooth
C. skeletal
D. two of the above
E. all of the above
Answer: C. skeletal
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Which of the following is a critical region of a tRNA molecule? (choose all that apply)
A. amino acid attachment site B. anticodon loop C. stop codon D. aminoacyl site E. ribosome binding site
Which of the following choices is not a function of the lymph vascular system?
a. delivers fats from food to the blood b. transports oxygen to cells and removes carbon dioxide c. returns water and plasma proteins to circulatory system d. transports cellular debris and pathogens to lymph nodes
The hormone ______ produced by the _______ gland promotes sleep and inhibits gonadal activity
a. melatonin; pineal b. thyroxin; thyroid c. cortisol; adrenal d. insulin; islets of Langerhans e. oxytocin; hypothalamus
Which of the following statements about RNA interference (or RNAi) is false?
(a) RNAi is a natural mechanism used to regulate genes. (b) During the process of RNAi, hybridization of a small RNA molecule with the mRNA degrades the mRNA. (c) Because RNAi depends on the introduction of a double-stranded RNA into a cell or an organism, it is not a process that can cause heritable changes in gene expression. (d) In C. elegans, RNAi can be introduced into the animals by feeding them with bacteria that produce the inhibitory RNA molecules.