Which organelle contains hydrolytic enzymes for the digestion of proteins, lipids, nucleic acids, and polysaccharides?
a. the Golgi complex
b. the rough endoplasmic reticulum
c. the nucleus
d. the lysosome
Ans: d. the lysosome
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In animal cells microtubules grow from which structure?
A. origination centers in the plasma membrane B. outer membrane of the nuclear envelope C. centrosomes containing centrioles D. dimerization centers located throughout the cytosol E. the tips of the chromosomes
The excretory system used by most annelids and adult mollusks consists of tubules called
a. nephrons. b. hepatic tubules. c. metanephridia. d. Malpighian tubules. e. protonephridia.
Efferent arterioles enter the Bowman's capsule and afferent arterioles leave the Bowman's capsule.
a. true b. false
The immune system is capable of mounting specific responses to particular microorganisms because ________
A) lymphocytes are able to change their antigen specificity as required to fight infection B) the body is able to determine which type of B and T cells to make C) the body contains an enormous diversity of B and T cells, each with a specific kind of antigen receptor D) the body is able to make different antigen receptors depending on the invading microorganism