Which of the following areas in a secondary lymphoid organ allows intimate contact between blood and the lymphocytes?
What will be an ideal response?
white pulp of the spleen
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Menstrual flow results in the discharge of ____
a. the follicle b. the corpus luteum c. the lining of the endometrium d. surface cells from the vagina e. blood from vessels on the outer side of the uterus
The extraembryonic membrane that secretes fluid around the developing embryo is the ____
a. allantois b. amnion c. chorion d. yolk sac e. both the allantois and the yolk sac
Which is false regarding passive transport?
a. It depends on concentration or electrical gradients. b. It involves weak binding between solute and protein. c. It requires an energy input. d. It depends on protein shape change. e. None of these are false.
Some plants fail to produce chlorophyll, and this trait appears to be recessive. Many plants also self-pollinate. If we locate a pea plant that is heterozygous for this trait, self-pollinate it and harvest seeds, what are the likely phenotypes of these seeds when they germinate?
A. All will be white and lack chlorophyll. B. About one-fourth will be green and three-fourths white. C. About one-half will be green and one-half white. D. About one-fourth will be white and three-fourths green. E. All will be green with chlorophyll.