What protein marker is found on the red blood cells of a person with type A blood?
A) A antigens only
B) B antigens only
C) Both A and B antigens
D) No ABO antigens are present.
Answer: A
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Amylase is an enzyme that promotes the breakdown of starches during digestion. Which of the following describes the method by which amylase functions?
A. It catalyzes starch breakdown without being changed or depleted. B. It changes its composition in order to break starch down itself. C. It functions as a hormone that signals for starch breakdown to begin. D. It inhibits chemical reactions by being changed or depleted by the starch.
Ridges that anchor muscles that stabilize the head are the
A) anterior and posterior nuchal lines. B) anterior and superior nuchal lines. C) inferior and superior nuchal lines. D) medial and lateral nuchal lines. E) cranial and caudal nuchal lines.
The reduction of heat loss via piloerection is a phenomenon commonly observed in
A) Birds and mammals. B) Heterothermic fish. C) Large flying insects. D) Marine reptiles.
Sperm cells are produced by the process of ________.
Fill in the blank(s) with the appropriate word(s).