Which of the following statements is FALSE concerning bacteria?
A. They are prokaryotic.
B. They can form endospores under unfavorable conditions.
C. They contain complex organelles composed of membranes.
D. They can be autotrophic or heterotrophic.
C. They contain complex organelles composed of membranes.
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Mendel demonstrated which of the following about inherited traits? Check all that apply.
_____ traits can be hidden in some generations, but subsequently reappear unchanged in future generations. _____ traits segregate among the offspring of a cross. _____ certain traits are more likely to appear than their alternatives. _____ some traits show blending inheritance. _____ parents that both have the same trait can have offspring with an alternative trait.
Why would the loss of helper T cells due to HIV infection result in the immunodeficiency associated with AIDS?
A. Helper T cells are central to the activation of other parts of the immune system. B. Helper T cells are normally present in higher numbers, so their loss reduces the total number of immune cells. C. Without helper T cells, plasma cells would not secrete antibody. D. Infection of the helper T cells could lead to infection and loss of progenitor cells, thereby eliminating all immune cells.
Which term describes the middle, muscular layer of the uterus?
A. Endometrium B. Myometrium C. Exometrium D. Perimetrium
Which of the following ethnic groups does NOT have Neanderthal DNA in their genome?
A. Western Europeans B. Australians C. Tibetans D. Africans