The human genome carries approximately 20,000 genes
a. True
b. False
ANSWER: True
Biology & Microbiology
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B and T cells are two kinds of _______ formed in bone marrow.
a. lymphocytes b. interferons c. antibodies d. effector cells
Biology & Microbiology
Snails and squids belong to the phylum
A. Cnidaria. B. Porifera. C. Platyhelminthes. D. Mollusca. E. Annelida.
Biology & Microbiology
The great size and mobility of the vertebrates are likely the result of
A) uterine development of offspring. B) increased brain size and complexity. C) lungs used for respiration. D) four-chambered hearts. E) lightweight endoskeletons.
Biology & Microbiology
Which of the following is a characteristic of active transport?
A. Use of ATP or a proton gradient as a source of metabolic energy B. Saturable uptake rate C. Can move materials against a concentration gradient D. All of the choices are correct.
Biology & Microbiology