What oxidizing agent can be used to disinfect wounds as well as nonliving surfaces
What will be an ideal response?
hydrogen peroxide
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A reflex arc differs from other responses to stimuli in that ____________________
a. it occurs without processing within the brain b. no neurons are required to bring about the response c. it involves a lot of integration and signal generation in the brain d. motor neurons are typically not activated
Which fossil is the earliest known bird with a beak? a. All of these had beaks
b. Sinosauropteryx c. None of these had a beak. d. Confuciusornis e. Archaeopteryx
Which of the following choices represents the correct
sequence? a. microspores >>> meiosis >>> gametophyte >>> sperm b. meiosis >>> microspores >>> gametophyte >>> sperm c. gametophyte >>> meiosis >>> megaspores >>> eggs d. meiosis >>> gametophyte >>> megaspores >>> eggs e. gametophyte >>> mitosis >>> megaspores >>> eggs
Which of the following statements about HIV is false?
a. HIV infection results in a dramatic decline in the helper T cell population. b. The first cells targeted by HIV are dendritic cells. c. Cytotoxic T cells are the main cells that attack HIV. d. Dendritic cells transport HIV from the mucosa to the lymph nodes. e. HIV attaches to the CD4 component of TH cells.