Nutrients and antibodies move across the placenta from mother to embryo or fetus, as do __________, which can cause birth defects.
Fill in the blank(s) with the appropriate word(s).
teratogens
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Stimulus
Match the letter of each example from childbirth to the appropriate component of a positive feedback loop. A. pituitary gland secretes oxytocin, which acts on the uterus B. uterine contractions increase C. fetus is pushed against uterine opening D. receptors detect stretch E. brain receives and compares stretch information Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about positive feedback? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Plants, algae, and certain prokaryotes are:a
photoheterotrophs b. chemoheterotrophs. c. chemoautotrophs. d. independent trophs. e. photoautotrophs.
A frameshift mutation results in _______________________.
A. a normal protein due to the redundancy of the genetic code. B. errors in DNA replication. C. errors in DNA splicing. D. a change in all mRNA codons downstream from the mutation. E. a change in the third position of one codon.
The process of exon shuffling for the origin of new genes is supported by the evidence that
a. exons evolve more slowly than introns do. b. unicellular eukaryotic genes have fewer exons than multicellular eukaryotic genes. c. different genes have related exons. d. very few prokaryotic genes have introns. e. duplicated genes often have exons in a different sequence than the original copy of the gene.