Briefly explain why children born with severe combined immune deficiency (SCID) often do not experience infection for several months after birth
What will be an ideal response?
Antibodies from the mother during pregnancy or breast-feeding provide temporary immunity.
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Proteins made by a ribosome reading through a transcript's stop codon without their own discrete ribosome binding sites
A) are thought to be a primitive mechanism to avoid host defenses. B) appear most abundant in archaeal viruses and relatively uncommon in bacteriophage. C) suggest a relatively low level of protein product is essential for the virus due to its rare frequency. D) create opportunities for viruses to make different capsid proteins.
How many times must the centrosomes replicate in order for meiosis to occur?
A. once B. twice C. four times D. Centrosomes do not replicate.
The first vertebrates appear in the fossil record during the
A. Cambrian Period. B. Proterozoic Era. C. Carboniferous Period. D. Triassic Period. E. Devonian Period.
Which of the following questions might scientists ask to most reliably determine if there has ever been life on Mars?
(A) How far from Earth was Mars 3.5 billion years ago? (B) Is there scientific proof that Earth ever hadan oxygen-free atmosphere? (C) Did Mars have the elements present in its atmosphere to support life? (D) Was there oxygen gas on Mars 3.5 billion years ago?