A condition in which the placenta forms in the lower half of the uterus and covers the cervix, which may result in premature birth or maternal hemorrhage, is called ________
A) placenta previa B) colostrum C) cesarean section D) neural tube
Answer: A
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A proficient engineer can easily design skeletal structures that are more functional than those currently found in the forelimbs of such diverse mammals as horses, whales, and bats. The actual forelimbs of these mammals do not seem to be optimally arrange
d because _____. A) natural selection has not had sufficient time to create the optimal design in each case, but will do so given enough time B) in many cases, phenotype is determined by genotype and the environment C) though we may not consider the fit between the current skeletal arrangements and their functions excellent, we should not doubt that natural selection ultimately produces the best design D) natural selection is generally limited to modifying structures that were present in previous generations and in previous species
In the electron transport system
A. NADH and FADH2 both donate electrons at the same location. B. NADH donates electrons "upstream" of where FADH2 donates electrons. C. NAD donates electrons at the head of the chain. D. NADP donates electrons in the middle of the chain.
Mitotic Cdk-cyclin is active when it is
A) singly phosphorylated. B) acetylated. C) doubly phosphorylated. D) doubly methylated. E) cleaved by proteases.
Which theory about the cause of colony collapse disorder has no evidence?
a. that pathogens are the cause b. that interference from cellphone towers is the cause c. that pests are the cause d. that drought is the cause