What prevents menstruation from occurring in the 10th week when the corpus luteum regresses?
A. The follicle takes over secretion of estradiol and progesterone.
B. The follicle takes over secretion of hCG.
C. The placenta takes over secretion of estradiol and progesterone.
D. The cervix takes over secretion of oxytocin and prostaglandins.
Answer: C
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In plants, the light-dependent reactions require
A. ATP. B. O2. C. NADP+. D. glucose. E. Calvin cycle enzymes.
A gene that no longer has any function is called
A. broken. B. a terminal gene. C. a pseudogene. D. negatively selected. E. a gene with a stopped molecular clock
Atmosphere is important in food spoilage; high H2S tends to reduce spoilage, while high CO2 tends to increase spoilage.
Answer the following statement true (T) or false (F)
The DNA in linear eukaryotic chromosomes is wrapped around proteins called _____________, which keep the DNA from getting tangled and enable an orderly, tight, and efficient packing of the DNA inside the cell.
a. histones b. histamines c. telomeres d. ribosomes e. centromeres