Receptors on every T cell detect foreign antigens on cells of the body by their association with the ________ on the surface of the infected cells of the body.
A) CD8
B) antibodies
C) membrane attack complex
D) CD4
E) major histocompatibility (MHC) molecule
Answer: E) major histocompatibility (MHC) molecule
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All of the following reasons—except one—explain why so many sperm are ejaculated when only one
is needed for fertilization. Which is the incorrect reason? a. Many sperm die by phagocytosis in the female tract. b. Many sperm swim up the wrong oviduct. c. The enzymes from many acrosomes are needed to penetrate the corona radiata. d. Many male pronuclei must be present in order to fuse with each female pronucleus. e. Many sperm die as a result of the unfavorable pH in the vagina.
What type of mutation occurred in the following? Normal allele GGAAUGAAACAGGAACCC Mutant allele GGAAUGAAACAGGUACCC
A. substitution B. insertion C. deletion D. frameshift
Which of the following statements about transmission electron microscopy is CORRECT?
A) Three-dimensional images are produced. B) Lasers are used for visualization. C) Up to 1,000,000X magnification may be achieved. D) Living specimens may be used. E) Stains can be applied to create a color image.
The formation and breaking of bonds between atoms requires
a. a chemical reaction. b. van der Walls forces. c. partial charges. d. an empty valence shell. e. an enzyme.