Membrane proteins are synthesized on ribosomes that are located
A) on the rough endoplasmic reticulum.
B) on the smooth endoplasmic reticulum.
C) in the nucleus.
D) in the cytoplasm.
E) on the Golgi apparatus.
A
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Based on the fossil record, which of these groups appeared first?
a. chimpanzees b. humans c. new world monkeys d. gorillas e. old world monkeys
An important reason that the nervous system and the endocrine systems are closely linked is _____
a. neurons and endocrine cells develop from an embryo’s ectodermal layer b. produce the same outcomes c. are regulated by the adrenal cortex d. are homologous e. are regulated by the brain
Which of the following statements concerning plasma cells is FALSE?
A) They live for many years and function as memory cells. B) They are descended from activated B cells. C) They can produce large quantities of antibodies on a daily basis. D) They secrete a single type of antibody molecule specific for a single epitope. E) The antibodies they produce can remain in circulation for weeks.
Why is milk often fortified with Vitamin D?
What will be an ideal response?