The "bead" that allows the HIV particle to attach to and enter cells is
a. made of protein.
b. hidden within the virus particle.
c. part of the matrix of the virus.
d. made of RNA.
e. designed to protect the virus's RNA.
A
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Keratitis is usually caused by ________.
A. Neisseria gonorrhoeae B. Staphylococcus aureus C. herpes simplex virus type 1 (HSV-1) D. Streptococcus pyogenes
You drive a nail into a tree that is 10 feet tall, and come back 10 years later. The tree is now 30 feet tall, but the nail is the same distance from the ground. This is because the tree grows up from
A. the apical meristem only. B. the lateral meristem only. C. both the lateral and apical meristems. D. the root tip. E. the node.
The umami receptor in the sense of taste detects _____
A) glucose B) potassium ions C) hydrogen ions D) monosodium glutamate
Antigens are substances that the immune system does not recognize as self. Which of the following are antigens?
A) HIV B) cancer cells in the lung C) strep throat bacteria D) All of these can act as antigens.