Secretions from which part of the male reproductive anatomy in humans produces molecules that stimulate smooth muscle contractions in the uterus of females?
A) prostate gland
B) seminal vesicles
C) bulbourethral gland
D) testes
Answer: B
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Which of the following is a difference between Class I and Class II major histocompatibility complex (MHC) proteins?
A) Class I MHC proteins can be found on most cell types, while Class I and II MHC proteins are found on the antigen presenting cells of the immune system B) Class I MHC proteins are added to antigens in the cytoplasm, while Class II proteins are added to antigens in the Golgi apparatus. C) Class I MHC proteins signal the immune system to activate the cell displaying the message, while Class II proteins signal the immune system to destroy a particular cell. D) Class I and Class II MHC proteins have the same basic role, but individuals with particularly strong immune systems will have both types, while most individuals have just one or the other.
What is the term for a culture made from one isolated colony?
A. Pure B. Mixed C. Axenic D. Both axenic and mixed are correct. E. Both axenic and pure are correct.
Radioactive isotopes have
a. excess electrons. b. excess protons. c. excess neutrons. d. insufficient neutrons. e. insufficient protons
Which is NOT a typical site for the occurrence of
meiosis? a. plant ovary b. plant root cells c. human testis d. human ovary e. plant anther