Chromosomes are made of ____ molecules and proteins
a. DNA
b. RNA
c. lipids
d. ATP
a
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From which primary germ layer is the lining of the digestive tract derived?
A. Ectoderm B. Endoderm C. Mesoderm
Which correctly describes the structure of an atom?
A. There are the same number of protons and neutrons. B. The number of protons, neutrons, and electrons never changes. C. There are the same number of neutrons and electrons. D. There are never the same number of neutrons and protons. E. There are the same number of protons and electrons.
Which of the following is the correct order of the layers of the cutaneous membrane?
A) epidermis, hypodermis, dermis B) dermis, epidermis, hypodermis C) epidermis, dermis, hypodermis D) hypodermis, dermis, epidermis E) dermis, hypodermis, dermis
The rubbery matrix of cartilage is secreted by ________, whereas ________ produce the fibers and ground substance that form the matrix of fibrous connective tissue
A) mast cells; fibroblasts B) adipocytes; plasma cells C) osteocytes; chondroblasts D) chondroblasts; plasma cells E) chondroblasts; fibroblasts