Which element is considered an essential micronutrient for plants?
a. zinc
b. potassium
c. hydrogen
d. arsenic
e. platinum
ANSWER: a
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The eye is a warm, moist environment favored by many harmful bacteria. Nevertheless, eye infections are relatively rare. Why is this?
A) The enzyme tearase inhibits bacterial growth. B) Tears contain the antibacterial enzyme lysozyme. C) The eyes are constantly exposed to UV light, which inhibits bacterial growth. D) Antibodies, particularly IgM, are secreted in abundance in the tears.
Ideal agricultural soil is:
a. loam. b. silt loam. c. sandy loam. d. clay loam. e. sandy.
The cleavage pattern is influenced by the amount of __________ and its distribution in the egg.
A. albumen B. yolk C. shell D. mRNA
Which of the following is a family of six-pointed, star-shaped viruses that cause gastrointestinal diseases?
A) Picornaviridae B) Caliciviridae C) Rhabdoviridae D) Coronaviridae E) Filoviridae