In bacteria, restriction enzymes function to ____
a. identify sequences of interest in a DNA library
b. produce human proteins
c. provide antibiotic resistance
d. chop up invading viral DNA
e. make the cells vulnerable to viruses
ANSWER: d
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One microenvironment of the skin is an area where glands produce an oily substance called
A) mucus. B) sebum. C) fimbrae. D) lipid A.
Who challenged the case for spontaneous generation with the concept of biogenesis?
a) Pasteur b) Virchow c) Redi d) Needham
How do mineral ions get into the xylem cells of a plant root by way of the intracellular route?
A) They travel between root cells to the xylem and then enter a xylem vessel. B) They are actively taken in to the xylem of root hairs. C) They are taken up by root hair cells and transferred from cell to cell via plasmodesmata. D) They move in solution through cell walls of the endodermis.
What subphylum do woodpeckers and shrews belong to?
A. Animalia B. Cephalochordata C. Chordata D. Urochordata E. Vertebrata