Which of the following situations is NOT a way in which a baby acquires normal microbiota?
A. The baby acquires the residential microbiota in the colon after the first meal.
B. Staphylococcus epidermidis is transferred from the hospital staff to the newborn after delivery.
C. microbes cross the placenta during pregnancy.
D. microorganisms grow in the respiratory tract after the baby's first breath.
E. microbes enter the nose and mouth when the baby is in the birth canal.
Answer: C
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Isolating chromosomes during metaphase then fragmenting, denaturing, and labeling them with a unique combination of fluorescent dyes is called
A. chromosome typing. B. chromosome painting. C. karyotyping. D. DNA painting. E. None of the answer options is correct.
Which structural motifs found in transcriptional regulatory proteins is thought to interact with DNA only through the minor groove?
A. homeodomain B. leucine zipper C. ?-barrel D. helix-turn-helix
Rapid turgor pressure changes in specialized multicellular swellings called ____________ are associated with leaves that move in response to touch or light.
A. petioles B. pulvini C. stipules D. pudicas E. coleoptiles
The coefficient of relatedness indicates
A) the number of relatives with a certain trait. B) the proportion of genes that types of relatives share. C) the heritability of a trait. D) the number of genes responsible for a polygenic trait.